commit 13c0d281b76f83a2cbccb298f9fe75c12fc8e737
Author: Sebastiano Tronto <sebastiano@tronto.net>
Date: Mon, 11 Dec 2023 15:14:47 +0100
Initial commit, some solutions
Diffstat:
| A | .gitignore | | | 1 | + |
| A | 2023/01/1a.c | | | 21 | +++++++++++++++++++++ |
| A | 2023/01/1b.c | | | 28 | ++++++++++++++++++++++++++++ |
| A | 2023/01/in.txt | | | 1000 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/02/2a.c | | | 33 | +++++++++++++++++++++++++++++++++ |
| A | 2023/02/2b.c | | | 33 | +++++++++++++++++++++++++++++++++ |
| A | 2023/02/in.txt | | | 100 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/03/3a.c | | | 51 | +++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/03/3b.c | | | 66 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/03/extra.txt | | | 3 | +++ |
| A | 2023/03/in.txt | | | 140 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/03/testcase.txt | | | 10 | ++++++++++ |
| A | 2023/04/4a.c | | | 43 | +++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/04/4b.c | | | 45 | +++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/04/in.txt | | | 212 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/05/5a.c | | | 45 | +++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/05/5b.c | | | 71 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/05/example.txt | | | 33 | +++++++++++++++++++++++++++++++++ |
| A | 2023/05/in.txt | | | 258 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/06/6a.c | | | 44 | ++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/06/6b.txt | | | 1 | + |
| A | 2023/06/in.txt | | | 2 | ++ |
| A | 2023/06/in2.txt | | | 2 | ++ |
| A | 2023/07/7a.c | | | 58 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/07/7b.c | | | 58 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/07/in.txt | | | 1000 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/08/8a.c | | | 35 | +++++++++++++++++++++++++++++++++++ |
| A | 2023/08/8b.c | | | 96 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/08/ex2.txt | | | 10 | ++++++++++ |
| A | 2023/08/in.txt | | | 752 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/09/9a.c | | | 46 | ++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/09/9b.c | | | 46 | ++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/09/in.txt | | | 200 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/10/10a.c | | | 76 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/10/10b.c | | | 156 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/10/in.txt | | | 140 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/11/11a.c | | | 39 | +++++++++++++++++++++++++++++++++++++++ |
| A | 2023/11/11b.c | | | 39 | +++++++++++++++++++++++++++++++++++++++ |
| A | 2023/11/in.txt | | | 140 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | 2023/README.md | | | 18 | ++++++++++++++++++ |
| A | README.md | | | 3 | +++ |
41 files changed, 5154 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+*/*/a.out
diff --git a/2023/01/1a.c b/2023/01/1a.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+#define N 10000
+
+int main() {
+ char *buf, line[N];
+ int first, last, sum;
+
+ sum = 0;
+ while ((buf = fgets(line, N, stdin)) != NULL) {
+ for (first = -1; *buf; buf++) {
+ if (*buf < '0' || *buf > '9')
+ continue;
+ first = first == -1 ? *buf - '0' : first;
+ last = *buf - '0';
+ }
+ sum += 10 * first + last;
+ }
+ printf("%d\n", sum);
+ return 0;
+}
diff --git a/2023/01/1b.c b/2023/01/1b.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <string.h>
+
+#define N 10000
+
+char *nums[10] = { "zero (unused)", "one", "two", "three", "four", "five",
+ "six", "seven", "eight", "nine" };
+
+int main() {
+ char *buf, line[N];
+ int j, first, last, sum;
+
+ sum = 0;
+ while ((buf = fgets(line, N, stdin)) != NULL) {
+ for (first = -1; *buf; buf++) {
+ for (j = 1; j < 10; j++)
+ if (!strncmp(buf, nums[j], strlen(nums[j])))
+ *buf = j + '0';
+ if (*buf < '0' || *buf > '9')
+ continue;
+ first = first == -1 ? *buf - '0' : first;
+ last = *buf - '0';
+ }
+ sum += 10 * first + last;
+ }
+ printf("%d\n", sum);
+ return 0;
+}
diff --git a/2023/01/in.txt b/2023/01/in.txt
@@ -0,0 +1,1000 @@
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diff --git a/2023/02/2a.c b/2023/02/2a.c
@@ -0,0 +1,33 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 10000
+
+#define MAX(x, y) ((x)>(y) ? (x) : (y))
+
+int color[26] = { ['r'-'a'] = 0, ['g'-'a'] = 1, ['b'-'a'] = 2 };
+
+int main() {
+ char *buf, line[N];
+ int i, sum, x, maxc[3];
+
+ for (i = 1, sum = 0; (buf = fgets(line, N, stdin)) != NULL; i++) {
+ maxc[0] = maxc[1] = maxc[2] = 0;
+ while (*buf++ != ':');
+ while (*buf++) {
+ if (*buf < '0' || *buf > '9')
+ continue;
+ x = atoi(buf);
+ while (*buf < 'a' || *buf > 'z')
+ buf++;
+ maxc[color[*buf-'a']] = MAX(maxc[color[*buf-'a']], x);
+ }
+ if (maxc[0] <= 12 && maxc[1] <= 13 && maxc[2] <= 14)
+ sum += i;
+ }
+
+ printf("%d\n", sum);
+ return 0;
+}
diff --git a/2023/02/2b.c b/2023/02/2b.c
@@ -0,0 +1,33 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 10000
+
+#define MAX(x, y) ((x)>(y) ? (x) : (y))
+
+int color[26] = { ['r'-'a'] = 0, ['g'-'a'] = 1, ['b'-'a'] = 2 };
+
+int main() {
+ char *buf, line[N];
+ int sum, x, maxc[3];
+
+ sum = 0;
+ while ((buf = fgets(line, N, stdin)) != NULL) {
+ maxc[0] = maxc[1] = maxc[2] = 0;
+ while (*buf++ != ':');
+ while (*buf++) {
+ if (*buf < '0' || *buf > '9')
+ continue;
+ x = atoi(buf);
+ while (*buf < 'a' || *buf > 'z')
+ buf++;
+ maxc[color[*buf-'a']] = MAX(maxc[color[*buf-'a']], x);
+ }
+ sum += maxc[0] * maxc[1] * maxc[2];
+ }
+
+ printf("%d\n", sum);
+ return 0;
+}
diff --git a/2023/02/in.txt b/2023/02/in.txt
@@ -0,0 +1,100 @@
+Game 1: 1 red, 10 blue, 5 green; 11 blue, 6 green; 6 green; 1 green, 1 red, 12 blue; 3 blue; 3 blue, 4 green, 1 red
+Game 2: 3 red, 5 green; 5 green, 7 red; 1 blue, 7 red, 3 green; 3 red, 2 blue; 5 green, 4 red
+Game 3: 4 blue, 4 green; 2 green, 2 blue; 8 green, 2 red, 3 blue
+Game 4: 3 blue, 15 green; 16 green; 2 red, 7 green; 2 blue, 14 green
+Game 5: 8 green, 6 red, 16 blue; 8 red, 12 green; 1 red, 9 green, 16 blue; 8 red, 3 green; 2 blue, 5 red, 10 green; 15 red, 4 blue, 8 green
+Game 6: 5 blue, 2 green; 6 red, 3 green; 4 green, 4 blue, 2 red; 14 blue, 2 red
+Game 7: 2 green, 6 blue, 1 red; 2 blue, 1 red; 8 blue; 5 blue, 1 green; 6 blue, 1 red; 2 blue
+Game 8: 1 red, 10 blue, 1 green; 6 blue, 1 red; 3 blue, 2 green; 1 red, 1 blue, 3 green; 13 blue; 10 blue, 3 green, 3 red
+Game 9: 2 blue; 8 green, 3 blue; 4 green; 14 green, 1 red, 2 blue; 3 blue, 1 red, 12 green
+Game 10: 1 blue, 7 green; 1 red, 3 green, 5 blue; 1 blue, 5 green, 1 red; 13 green, 5 blue, 2 red
+Game 11: 1 green, 10 red, 6 blue; 15 red, 12 blue; 18 red, 1 green, 1 blue
+Game 12: 16 red, 8 blue, 1 green; 15 red, 3 blue, 1 green; 5 red
+Game 13: 6 red, 7 blue, 7 green; 3 blue, 4 red, 13 green; 1 blue, 6 red, 11 green; 2 red, 1 blue, 14 green; 8 green, 5 blue, 2 red; 4 blue, 18 green, 4 red
+Game 14: 16 red, 3 blue, 1 green; 7 green, 3 red; 16 red, 15 green, 3 blue; 3 blue, 13 red, 10 green
+Game 15: 1 blue, 1 red; 3 blue, 2 green; 1 red; 2 red, 2 green, 3 blue; 3 blue, 1 red, 3 green
+Game 16: 9 red, 3 blue; 13 red, 9 blue; 9 blue, 10 red; 5 red, 10 blue, 1 green; 2 red, 6 green, 8 blue; 6 green, 13 red, 5 blue
+Game 17: 15 red, 17 green, 8 blue; 18 red, 16 blue, 15 green; 8 blue, 17 green, 10 red; 5 green, 3 red, 12 blue
+Game 18: 2 blue, 11 red, 2 green; 1 green, 11 red, 11 blue; 1 red, 4 blue; 10 blue, 9 red; 1 blue, 7 red
+Game 19: 2 blue, 3 green, 5 red; 8 blue, 16 green; 12 red, 7 blue, 8 green; 9 green, 1 blue; 3 red, 16 green, 10 blue
+Game 20: 3 blue, 5 green, 6 red; 2 red, 8 blue, 7 green; 7 green, 3 blue; 2 red, 11 blue; 1 green, 6 red, 3 blue
+Game 21: 16 red, 3 blue, 8 green; 10 red, 15 blue, 3 green; 6 green, 13 red, 15 blue; 11 green, 13 blue, 10 red
+Game 22: 8 green, 1 blue; 2 blue, 9 green, 3 red; 2 red, 2 blue; 1 red, 3 blue, 8 green; 2 blue, 1 green; 1 green, 2 blue
+Game 23: 2 blue, 8 red, 5 green; 9 green, 2 blue; 10 red, 2 green; 12 red, 1 blue; 11 green, 2 blue, 13 red; 7 green
+Game 24: 6 red; 13 green, 7 red, 10 blue; 7 green, 9 red, 1 blue; 3 blue, 2 green, 2 red
+Game 25: 7 green, 1 red, 2 blue; 8 green, 2 blue, 5 red; 5 blue, 8 green, 4 red; 5 blue, 2 green, 1 red; 5 green, 3 red, 7 blue; 3 blue, 6 green, 1 red
+Game 26: 6 green, 3 red; 1 blue, 2 green, 2 red; 2 green, 2 red, 3 blue; 4 blue, 8 red, 2 green; 1 red, 1 green, 1 blue; 6 red, 5 blue
+Game 27: 4 green, 13 blue, 2 red; 2 red, 7 green, 10 blue; 14 blue, 11 green, 1 red; 10 blue, 15 green
+Game 28: 4 green, 13 red, 7 blue; 2 red, 5 blue; 5 blue, 4 green
+Game 29: 6 green, 15 red; 1 blue, 6 red, 8 green; 6 green, 1 blue; 12 red; 1 green, 7 red, 1 blue
+Game 30: 4 blue, 4 green, 2 red; 6 blue, 9 red, 20 green; 9 blue, 4 red, 2 green; 8 red, 8 blue, 1 green; 6 green, 12 blue, 2 red; 8 green, 8 red
+Game 31: 9 blue; 1 red, 2 blue, 5 green; 2 blue, 2 red, 9 green; 2 blue, 1 red, 8 green; 11 green, 2 red, 3 blue; 7 green, 5 blue
+Game 32: 15 red, 5 green; 4 green, 2 blue, 3 red; 1 blue, 9 red; 1 blue, 15 red; 4 blue, 2 red, 8 green; 3 green, 3 blue
+Game 33: 13 blue, 1 red, 1 green; 8 blue, 6 red; 4 blue, 2 red
+Game 34: 5 blue, 9 red, 7 green; 8 red, 6 green, 5 blue; 2 blue, 7 green, 12 red
+Game 35: 4 blue, 15 red; 1 green, 10 blue, 7 red; 9 red, 3 green, 1 blue; 13 red, 9 blue; 3 blue, 2 red
+Game 36: 4 blue, 18 green, 2 red; 5 green, 6 blue, 11 red; 6 red, 12 blue, 14 green; 19 green, 10 blue, 7 red; 7 red, 8 green, 9 blue
+Game 37: 16 blue, 5 green, 18 red; 3 blue, 14 green, 1 red; 4 blue, 3 green, 14 red; 12 green, 7 red, 15 blue; 15 green, 11 blue, 2 red; 8 blue, 13 green, 6 red
+Game 38: 6 red, 4 blue, 12 green; 3 red, 11 blue; 16 green, 2 blue, 8 red; 4 blue, 11 red, 4 green; 17 green, 7 red, 10 blue; 9 blue, 15 green, 1 red
+Game 39: 1 green, 1 red, 10 blue; 1 red, 5 blue, 2 green; 4 red, 7 blue; 9 red, 6 green, 5 blue; 1 green, 2 blue, 9 red
+Game 40: 13 blue, 11 red, 12 green; 8 green, 11 red, 4 blue; 2 blue, 2 green, 12 red; 2 green, 3 red, 13 blue; 13 blue, 6 red, 2 green; 4 green, 6 red, 8 blue
+Game 41: 12 red, 4 green, 13 blue; 4 red, 7 blue, 10 green; 17 green, 17 red, 11 blue
+Game 42: 1 red, 1 green; 1 red, 4 green; 1 blue, 4 red, 4 green; 3 red; 1 blue, 3 green, 1 red
+Game 43: 7 blue, 10 green; 5 blue, 2 green; 2 blue, 1 green, 4 red; 14 red, 6 green, 7 blue; 4 green, 14 red, 8 blue; 4 green, 6 red
+Game 44: 9 green, 4 red; 4 red, 6 green; 5 red, 2 blue, 7 green; 9 blue, 1 green, 14 red
+Game 45: 20 blue, 4 red, 6 green; 3 blue, 1 green, 6 red; 8 blue, 8 green, 11 red
+Game 46: 1 green, 6 red; 6 red, 3 blue, 3 green; 6 red, 3 blue, 4 green; 1 blue, 5 red; 1 green, 4 red, 1 blue; 2 green, 4 red
+Game 47: 12 green, 8 red, 4 blue; 7 green, 6 red, 11 blue; 4 red, 11 blue, 12 green
+Game 48: 1 green, 3 blue; 13 green, 3 red, 11 blue; 7 blue, 1 green, 2 red; 7 red, 15 green, 4 blue; 4 red, 8 blue, 10 green; 15 green, 8 blue, 6 red
+Game 49: 2 red; 2 red, 9 blue; 4 blue, 1 green
+Game 50: 10 blue, 1 green, 18 red; 13 red, 1 green, 7 blue; 4 red, 2 green, 9 blue; 2 green, 4 red, 10 blue; 7 blue, 3 red; 19 red, 9 blue
+Game 51: 2 green, 2 red, 5 blue; 9 red, 5 blue; 3 red, 10 blue; 9 blue, 6 red, 7 green; 2 red, 5 blue
+Game 52: 6 blue, 3 green; 5 green, 3 blue, 5 red; 1 blue, 2 green, 2 red
+Game 53: 2 blue, 9 green, 15 red; 18 red, 1 blue; 13 red, 12 green; 7 green, 2 blue, 9 red
+Game 54: 18 green; 2 red, 6 green; 6 red, 9 green, 1 blue; 1 blue, 4 green, 5 red; 3 red; 3 green, 4 red
+Game 55: 5 red, 2 blue, 5 green; 10 blue, 4 green, 8 red; 15 green, 9 blue, 9 red; 1 green, 9 blue
+Game 56: 8 green, 11 blue, 1 red; 1 blue, 1 red, 4 green; 8 blue
+Game 57: 5 green, 4 blue; 1 blue, 4 green; 1 red, 1 green, 3 blue; 1 red, 2 blue, 6 green
+Game 58: 8 green, 10 red, 10 blue; 8 blue, 6 green, 12 red; 9 green, 11 blue, 1 red; 12 red, 5 green, 11 blue; 7 red, 2 green, 8 blue
+Game 59: 10 red, 1 green, 3 blue; 16 red, 1 green, 4 blue; 9 red, 2 blue; 1 red
+Game 60: 11 blue, 13 green, 10 red; 15 red, 12 blue; 3 blue, 9 green, 6 red; 12 blue, 5 green
+Game 61: 2 blue, 7 red; 3 green, 14 blue, 11 red; 7 red, 10 blue; 6 blue, 3 green, 4 red; 10 blue
+Game 62: 1 blue, 7 green; 6 red, 12 green, 1 blue; 8 red
+Game 63: 1 blue, 3 green, 1 red; 8 green, 10 red, 1 blue; 8 green, 11 red; 1 blue, 11 green, 5 red; 8 green, 11 red, 2 blue; 2 blue, 10 red, 6 green
+Game 64: 17 green, 2 blue; 12 blue, 8 green; 11 green, 3 red, 4 blue; 5 red, 9 green, 14 blue
+Game 65: 7 blue, 12 green, 5 red; 13 green, 5 blue, 4 red; 4 blue, 8 green, 1 red; 5 red, 10 green, 10 blue; 5 red, 5 blue, 15 green; 4 red, 9 green, 10 blue
+Game 66: 8 green, 2 red; 8 red, 4 green; 5 red, 2 blue, 7 green
+Game 67: 10 green, 7 blue, 2 red; 15 blue, 1 green, 9 red; 2 red, 7 green, 18 blue; 3 green, 5 blue, 8 red; 10 green, 11 blue, 1 red; 10 green, 4 red, 17 blue
+Game 68: 13 green, 10 blue, 7 red; 1 red, 15 green, 7 blue; 17 green, 14 red, 3 blue; 6 green, 8 blue, 6 red; 4 red, 3 blue, 5 green
+Game 69: 1 red, 6 green, 3 blue; 3 red, 4 blue, 6 green; 2 blue, 2 red, 1 green; 6 blue, 9 green, 2 red; 5 green, 6 blue
+Game 70: 1 green, 1 red, 3 blue; 2 green, 4 blue, 8 red; 5 red, 2 green, 3 blue; 3 green, 1 red, 3 blue; 3 green, 4 blue
+Game 71: 11 blue, 13 green; 1 red, 11 green, 3 blue; 6 blue, 14 green, 1 red; 5 blue, 17 green
+Game 72: 3 blue, 10 green, 4 red; 2 green, 6 red, 13 blue; 1 green, 1 blue, 6 red; 5 red, 1 blue, 1 green; 2 green, 5 red, 5 blue; 9 blue, 10 green, 6 red
+Game 73: 6 red, 4 green, 1 blue; 1 blue, 5 red, 3 green; 2 red, 11 green, 3 blue
+Game 74: 13 green, 2 red, 2 blue; 5 blue, 6 green; 12 green, 3 red, 4 blue; 2 green
+Game 75: 9 red, 10 blue, 6 green; 12 blue, 9 red; 11 red, 6 green; 12 blue, 2 red, 1 green
+Game 76: 1 green, 2 blue, 5 red; 2 blue, 1 green; 1 blue, 2 green, 1 red; 2 blue, 1 red; 3 green, 3 red
+Game 77: 5 green, 12 blue, 3 red; 11 blue, 9 green, 13 red; 8 blue, 13 green, 13 red
+Game 78: 2 red, 3 blue, 1 green; 1 green, 19 blue, 1 red; 7 blue, 2 green, 2 red
+Game 79: 5 red, 1 blue, 4 green; 1 blue, 9 green, 10 red; 13 red, 1 green; 1 blue, 1 red, 5 green
+Game 80: 13 green, 2 blue; 1 red, 4 blue, 13 green; 5 red, 7 green, 4 blue
+Game 81: 3 red, 4 blue, 12 green; 16 green, 5 red, 1 blue; 4 blue, 2 red, 2 green; 4 blue, 5 red, 13 green; 8 red, 4 blue, 13 green; 16 green, 3 red
+Game 82: 6 red, 3 green, 2 blue; 1 green, 6 red, 2 blue; 3 blue, 8 green, 9 red
+Game 83: 3 green, 3 red, 1 blue; 3 blue, 4 green, 3 red; 3 blue, 4 green, 1 red; 2 red, 8 green, 2 blue
+Game 84: 5 red, 6 blue, 3 green; 1 blue, 2 green; 3 green, 2 blue, 2 red; 1 red, 3 green, 6 blue; 12 red, 2 green; 4 blue, 2 green, 4 red
+Game 85: 11 green, 4 blue, 9 red; 13 red, 1 blue, 11 green; 7 green, 8 blue, 7 red; 1 red, 4 blue
+Game 86: 3 blue, 19 green, 7 red; 19 green, 1 red, 1 blue; 9 green, 2 red; 7 red, 6 green, 1 blue
+Game 87: 1 blue, 1 green, 4 red; 1 green, 6 red; 6 red, 2 blue; 8 red, 3 blue
+Game 88: 9 red, 6 blue; 4 red, 1 blue, 2 green; 1 green, 10 blue, 6 red; 2 blue, 1 green, 10 red; 7 red, 9 blue
+Game 89: 3 blue, 15 green, 1 red; 1 red, 13 green, 3 blue; 4 blue, 14 green, 4 red; 10 green, 1 blue
+Game 90: 1 red, 13 green; 3 green, 1 red, 5 blue; 5 blue, 6 green; 14 green, 4 blue; 3 blue, 10 green; 13 green, 1 red
+Game 91: 13 green, 11 red, 4 blue; 14 red, 1 green, 10 blue; 4 red, 2 green, 3 blue
+Game 92: 2 red, 3 blue, 6 green; 2 red, 2 blue, 8 green; 14 blue, 1 red, 1 green
+Game 93: 15 blue, 2 red, 13 green; 8 green, 2 red, 8 blue; 6 blue, 1 red, 2 green
+Game 94: 5 red, 4 green, 9 blue; 1 red, 5 green, 4 blue; 11 blue, 4 green, 2 red
+Game 95: 9 blue, 3 green; 2 green, 12 blue; 10 green, 3 blue; 1 green, 1 red, 10 blue
+Game 96: 4 blue, 2 red; 3 green, 10 blue, 7 red; 2 blue, 7 green, 1 red; 13 blue, 9 green; 10 blue, 4 green, 1 red
+Game 97: 6 red, 4 green; 1 blue, 13 red; 3 green, 13 red
+Game 98: 1 red, 13 blue, 1 green; 7 green, 5 blue, 3 red; 15 blue, 6 green; 4 blue, 5 green; 13 blue, 2 green, 1 red; 4 blue, 3 red, 2 green
+Game 99: 1 red, 2 green; 2 red, 2 blue, 1 green; 3 green, 1 blue, 6 red; 3 red, 4 green; 5 red, 1 blue, 4 green; 1 blue, 2 red, 1 green
+Game 100: 9 green, 2 blue, 12 red; 2 blue, 14 red, 2 green; 14 red, 12 green
diff --git a/2023/03/3a.c b/2023/03/3a.c
@@ -0,0 +1,51 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 1000
+
+bool isnum(char c) { return c >= '0' && c <= '9'; }
+bool issymbol(char c) { return c != '.' && c != 0 && c != '\n' && !isnum(c); }
+
+int grab(char *buf) {
+ int x;
+
+ if (!isnum(*buf))
+ return 0;
+
+ while (isnum(*buf)) buf--;
+ buf++;
+ x = atoi(buf);
+ while (isnum(*buf)) *buf++ = '.';
+
+ return x;
+}
+
+int main() {
+ char line[N], prev[N];
+ bool l, c, r, ul, uc, ur;
+ int i, sum;
+
+ sum = 0;
+ memset(line, '.', N);
+ memset(prev, '.', N);
+ while (fgets(&line[1], N-1, stdin) != NULL) {
+ for (i = 1; line[i]; i++) {
+ l = issymbol(line[i-1]);
+ c = issymbol(line[i]);
+ r = issymbol(line[i+1]);
+ ul = issymbol(prev[i-1]);
+ uc = issymbol(prev[i]);
+ ur = issymbol(prev[i+1]);
+ if (l || r || ul || uc || ur)
+ sum += grab(&line[i]);
+ if (l || c || r)
+ sum += grab(&prev[i]);
+ }
+ memcpy(prev, line, N);
+ }
+
+ printf("%d\n", sum);
+ return 0;
+}
diff --git a/2023/03/3b.c b/2023/03/3b.c
@@ -0,0 +1,66 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 1000
+
+bool isnum(char c) { return c >= '0' && c <= '9'; }
+
+int grab(char *buf) {
+ int x;
+
+ if (!isnum(*buf))
+ return 0;
+
+ while (isnum(*buf)) buf--;
+ buf++;
+ x = atoi(buf);
+ while (isnum(*buf)) *buf++ = '.';
+
+ return x;
+}
+
+void push(int *j, int *g, char *buf) {
+ g[*j] = grab(buf);
+ if (g[*j] > 0) (*j)++;
+}
+
+int main() {
+ char *cont, line[N], prev[N], next[N], backup[3][N];
+ int i, sum, j, g[9];
+
+ sum = 0;
+ memset(line, '.', N);
+ memset(prev, '.', N);
+ memset(next, '.', N);
+ cont = fgets(&next[1], N-1, stdin);
+ while (cont != NULL) {
+ memcpy(line, next, N);
+ cont = fgets(&next[1], N-1, stdin);
+ for (i = 1; line[i]; i++) {
+ if (line[i] == '*') {
+ memcpy(backup[0], prev, N);
+ memcpy(backup[1], line, N);
+ memcpy(backup[2], next, N);
+ j = 0;
+ push(&j, g, &prev[i-1]);
+ push(&j, g, &prev[i]);
+ push(&j, g, &prev[i+1]);
+ push(&j, g, &line[i-1]);
+ push(&j, g, &line[i+1]);
+ push(&j, g, &next[i-1]);
+ push(&j, g, &next[i]);
+ push(&j, g, &next[i+1]);
+ if (j == 2) sum += g[0] * g[1];
+ memcpy(prev, backup[0], N);
+ memcpy(line, backup[1], N);
+ memcpy(next, backup[2], N);
+ }
+ }
+ memcpy(prev, line, N);
+ }
+
+ printf("%d\n", sum);
+ return 0;
+}
diff --git a/2023/03/extra.txt b/2023/03/extra.txt
@@ -0,0 +1,3 @@
+1*.
+.*.
+1..
diff --git a/2023/03/in.txt b/2023/03/in.txt
@@ -0,0 +1,140 @@
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diff --git a/2023/03/testcase.txt b/2023/03/testcase.txt
@@ -0,0 +1,10 @@
+467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598..
diff --git a/2023/04/4a.c b/2023/04/4a.c
@@ -0,0 +1,43 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 1000
+
+bool isnum(char c) { return c >= '0' && c <= '9'; }
+
+int main() {
+ char *buf, line[N];
+ int i, j, x, sum, nw, nr, w[100], r[100];
+
+ sum = 0;
+ while ((buf = fgets(line, N, stdin)) != NULL) {
+ nr = nw = 0;
+ while (*buf != ':') buf++;
+ while (*buf != '|') {
+ buf++;
+ if (!isnum(*buf)) continue;
+ w[nw++] = atoi(buf);
+ while (isnum(*buf)) buf++;
+ }
+ while (*buf != '\n') {
+ buf++;
+ if (!isnum(*buf)) continue;
+ r[nr++] = atoi(buf);
+ while (isnum(*buf)) buf++;
+ }
+ for (x = 0, i = 0; i < nr; i++) {
+ for (j = 0; j < nw; j++) {
+ if (r[i] == w[j]) {
+ x++;
+ break;
+ }
+ }
+ }
+ sum += 1 << (x-1);
+ }
+
+ printf("%d\n", sum);
+ return 0;
+}
diff --git a/2023/04/4b.c b/2023/04/4b.c
@@ -0,0 +1,45 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 1000
+
+bool isnum(char c) { return c >= '0' && c <= '9'; }
+
+int main() {
+ char *buf, line[N];
+ int c, i, j, x, sum, nw, nr, w[100], r[100], sc[N];
+
+ sum = c = 0;
+ memset(sc, 0, N * sizeof(int));
+ while ((buf = fgets(line, N, stdin)) != NULL) {
+ nr = nw = 0;
+ sc[++c]++;
+ while (*buf != ':') buf++;
+ while (*buf != '|') {
+ buf++;
+ if (!isnum(*buf)) continue;
+ w[nw++] = atoi(buf);
+ while (isnum(*buf)) buf++;
+ }
+ while (*buf != '\n') {
+ buf++;
+ if (!isnum(*buf)) continue;
+ r[nr++] = atoi(buf);
+ while (isnum(*buf)) buf++;
+ }
+ for (x = 0, i = 0; i < nr; i++) {
+ for (j = 0; j < nw; j++) {
+ if (r[i] == w[j]) {
+ sc[(++x) + c] += sc[c];
+ break;
+ }
+ }
+ }
+ sum += sc[c];
+ }
+
+ printf("%d\n", sum);
+ return 0;
+}
diff --git a/2023/04/in.txt b/2023/04/in.txt
@@ -0,0 +1,212 @@
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diff --git a/2023/05/5a.c b/2023/05/5a.c
@@ -0,0 +1,45 @@
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 100
+
+bool isnum(char c) { return c >= '0' && c <= '9'; }
+
+int main() {
+ char *buf, line[N];
+ int64_t i, m, ns, seed[N], next[N], r[3];
+
+ for (ns = 0, buf = fgets(line, N, stdin); *buf; buf++) {
+ if (!isnum(*buf)) continue;
+ next[ns++] = atoll(buf);
+ while (isnum(*buf)) buf++;
+ }
+
+
+ while ((buf = fgets(line, N, stdin)) != NULL) {
+ if (!isnum(*buf)) {
+ memcpy(seed, next, ns * sizeof(int64_t));
+ fgets(line, N, stdin); /* Discard description */
+ continue;
+ }
+
+ for (i = 0; *buf; buf++) {
+ r[i++] = atoll(buf);
+ while (isnum(*buf)) buf++;
+ }
+
+ for (i = 0; i < ns; i++)
+ if (seed[i] >= r[1] && seed[i] < r[1] + r[2])
+ next[i] = seed[i] + (r[0] - r[1]);
+ }
+
+ m = next[0];
+ for (i = 1; i < ns; i++)
+ m = m > next[i] ? next[i] : m;
+
+ printf("%" PRId64 "\n", m);
+ return 0;
+}
diff --git a/2023/05/5b.c b/2023/05/5b.c
@@ -0,0 +1,71 @@
+/* For part 2 we save ranges as (first, last) instead of (first, length) */
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 10000
+
+#define MIN(a, b) ((a)<(b)?(a):(b))
+#define MAX(a, b) ((a)>(b)?(a):(b))
+
+bool isnum(char c) { return c >= '0' && c <= '9'; }
+
+void append(int64_t dst[][2], int64_t src[][2], int64_t *nr, int64_t *nnr) {
+ for (int i = 0; i < *nnr; i++) {
+ dst[i+*nr][0] = src[i][0];
+ dst[i+*nr][1] = src[i][1];
+ }
+ *nr += *nnr;
+ *nnr = 0;
+}
+
+int64_t readl(int64_t nums[], char *buf) {
+ int64_t i;
+ for (i = 0; *buf; buf++) {
+ if (!isnum(*buf)) continue;
+ nums[i++] = atoll(buf);
+ while (isnum(*buf)) buf++;
+ }
+ return i;
+}
+
+int main() {
+ char *buf, line[N];
+ int64_t i, li, ri, m, nr, nnr, r[3], range[N][2], next[N][2], aux[N];
+
+ nnr = readl(aux, fgets(line, N, stdin)) / 2;
+ for (i = 0; i < nnr; i++) {
+ next[i][0] = aux[2*i];
+ next[i][1] = aux[2*i+1] + next[i][0] - 1;
+ }
+
+ for (nr = 0; (buf = fgets(line, N, stdin)) != NULL; ) {
+ if (!isnum(*buf)) {
+ append(range, next, &nr, &nnr);
+ continue;
+ }
+
+ readl(r, buf);
+ for (i = 0; i < nr; i++) {
+ li = range[i][0];
+ ri = range[i][1];
+ if (li > ri || r[1] > ri || r[1]+r[2]-1 < li) continue;
+ range[i][1] = MIN(ri, r[1]-1);
+ next[nnr][0] = MAX(li, r[1]) + r[0]-r[1];
+ next[nnr++][1] = MIN(ri, r[1]+r[2]-1) + r[0]-r[1];
+ range[nr][0] = MAX(li, r[1]+r[2]);
+ range[nr++][1] = ri;
+ }
+ }
+
+ append(range, next, &nr, &nnr);
+ for (i = 0, m = -1; i < nr; i++)
+ if (range[i][0] <= range[i][1])
+ m = m == -1 || m > range[i][0] ? range[i][0] : m;
+
+ printf("%" PRId64 "\n", m);
+ return 0;
+}
diff --git a/2023/05/example.txt b/2023/05/example.txt
@@ -0,0 +1,33 @@
+seeds: 79 14 55 13
+
+seed-to-soil map:
+50 98 2
+52 50 48
+
+soil-to-fertilizer map:
+0 15 37
+37 52 2
+39 0 15
+
+fertilizer-to-water map:
+49 53 8
+0 11 42
+42 0 7
+57 7 4
+
+water-to-light map:
+88 18 7
+18 25 70
+
+light-to-temperature map:
+45 77 23
+81 45 19
+68 64 13
+
+temperature-to-humidity map:
+0 69 1
+1 0 69
+
+humidity-to-location map:
+60 56 37
+56 93 4
diff --git a/2023/05/in.txt b/2023/05/in.txt
@@ -0,0 +1,258 @@
+seeds: 1347397244 12212989 2916488878 1034516675 2821376423 8776260 2240804122 368941186 824872000 124877531 1597965637 36057332 4091290431 159289722 1875817275 106230212 998513229 159131132 2671581775 4213184
+
+seed-to-soil map:
+2988689842 4194451945 100515351
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+588295233 2638661119 66434163
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+654729396 1377923552 509460629
+2557749253 1211672006 166251546
+2724000799 1071510728 140161278
+
+soil-to-fertilizer map:
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+4282604623 2661805644 12362673
+147926030 509440958 200643196
+1876076668 54083108 66812274
+1243388572 1760335755 55086123
+
+fertilizer-to-water map:
+2460553918 850437816 63304366
+1259757436 1986466040 193004355
+2879827793 2638634287 61837387
+39629536 0 3143529
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+260119618 2700471674 920465803
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+2053779516 1879323003 107143037
+
+water-to-light map:
+2196302869 3170532562 121192468
+3065704582 2916528129 254004433
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+3789349818 1163360430 70779786
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+
+light-to-temperature map:
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+
+temperature-to-humidity map:
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+
+humidity-to-location map:
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diff --git a/2023/06/6a.c b/2023/06/6a.c
@@ -0,0 +1,44 @@
+#include <inttypes.h>
+#include <math.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 100000
+
+#define MIN(a, b) ((a)<(b)?(a):(b))
+#define MAX(a, b) ((a)>(b)?(a):(b))
+
+bool isnum(char c) { return c >= '0' && c <= '9'; }
+
+int64_t readl(int64_t nums[], char *buf) {
+ int64_t i;
+ for (i = 0; *buf; buf++) {
+ if (!isnum(*buf)) continue;
+ nums[i++] = atoll(buf);
+ while (isnum(*buf)) buf++;
+ }
+ return i;
+}
+
+int main() {
+ char line[N], clean[N];
+ int64_t i, n, p, D, x1, x2, t[N], d[N];
+
+ n = readl(t, fgets(line, N, stdin));
+ readl(d, fgets(line, N, stdin));
+
+ p = 1;
+ for (i = 0; i < n; i++) {
+ D = t[i]*t[i] - 4*d[i];
+ if (D < 0) p = 1;
+ double sq = sqrt(D);
+ x1 = (int64_t)floor((t[i] - sq)/2) + 1;
+ x2 = (int64_t)ceil((t[i] + sq)/2) - 1;
+ p *= x2 - x1 + 1;
+ }
+
+ printf("%" PRId64 "\n", p);
+ return 0;
+}
diff --git a/2023/06/6b.txt b/2023/06/6b.txt
@@ -0,0 +1 @@
+Just use 6a and modify the input file manually
diff --git a/2023/06/in.txt b/2023/06/in.txt
@@ -0,0 +1,2 @@
+Time: 41 96 88 94
+Distance: 214 1789 1127 1055
diff --git a/2023/06/in2.txt b/2023/06/in2.txt
@@ -0,0 +1,2 @@
+Time: 41968894
+Distance: 214178911271055
diff --git a/2023/07/7a.c b/2023/07/7a.c
@@ -0,0 +1,58 @@
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 100000
+
+int value[255] = {
+ ['2'] = 2, ['3'] = 3, ['4'] = 4, ['5'] = 5,
+ ['6'] = 6, ['7'] = 7, ['8'] = 8, ['9'] = 9,
+ ['T'] = 10, ['J'] = 11, ['Q'] = 12, ['K'] = 13, ['A'] = 14
+};
+
+typedef struct {
+ char c[5];
+ int64_t b;
+} hand_t;
+
+int strength(hand_t h) {
+ int i, c2, c1, s, x[15];
+
+ memset(x, 0, 15 * sizeof(int));
+ for (i = 0, s = 0; i < 5; i++) {
+ s = s * 15 + value[h.c[i]];
+ x[value[h.c[i]]]++;
+ }
+ for (i = 2, c1 = 0, c2 = 0; i < 15; i++) {
+ if (c1 < x[i]) {
+ c2 = c1;
+ c1 = x[i];
+ } else if (c2 < x[i]) c2 = x[i];
+ }
+
+ return (c1*5 + c2) * 759375 + s;
+}
+
+int compare(const void *h1, const void *h2) {
+ return strength(*(hand_t *)h1) - strength(*(hand_t *)h2);
+}
+
+int main() {
+ char line[N];
+ hand_t hand[N];
+ int64_t i, n, p;
+
+ for (n = 0; fgets(line, N, stdin) != NULL; n++) {
+ memcpy(hand[n].c, line, 5);
+ hand[n].b = atoll(line+6);
+ }
+
+ qsort(hand, n, sizeof(hand_t), &compare);
+
+ for (i = 0, p = 0; i < n; i++)
+ p += hand[i].b * (i+1);
+
+ printf("%" PRId64 "\n", p);
+ return 0;
+}
diff --git a/2023/07/7b.c b/2023/07/7b.c
@@ -0,0 +1,58 @@
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 100000
+
+int value[255] = {
+ ['2'] = 2, ['3'] = 3, ['4'] = 4, ['5'] = 5,
+ ['6'] = 6, ['7'] = 7, ['8'] = 8, ['9'] = 9,
+ ['T'] = 10, ['J'] = 1, ['Q'] = 12, ['K'] = 13, ['A'] = 14
+};
+
+typedef struct {
+ char c[5];
+ int64_t b;
+} hand_t;
+
+int strength(hand_t h) {
+ int i, c2, c1, s, x[15];
+
+ memset(x, 0, 15 * sizeof(int));
+ for (i = 0, s = 0; i < 5; i++) {
+ s = s * 15 + value[h.c[i]];
+ x[value[h.c[i]]]++;
+ }
+ for (i = 2, c1 = 0, c2 = 0; i < 15; i++) {
+ if (c1 < x[i]) {
+ c2 = c1;
+ c1 = x[i];
+ } else if (c2 < x[i]) c2 = x[i];
+ }
+
+ return ((c1+x[1])*5 + c2) * 759375 + s;
+}
+
+int compare(const void *h1, const void *h2) {
+ return strength(*(hand_t *)h1) - strength(*(hand_t *)h2);
+}
+
+int main() {
+ char line[N];
+ hand_t hand[N];
+ int64_t i, n, p;
+
+ for (n = 0; fgets(line, N, stdin) != NULL; n++) {
+ memcpy(hand[n].c, line, 5);
+ hand[n].b = atoll(line+6);
+ }
+
+ qsort(hand, n, sizeof(hand_t), &compare);
+
+ for (i = 0, p = 0; i < n; i++)
+ p += hand[i].b * (i+1);
+
+ printf("%" PRId64 "\n", p);
+ return 0;
+}
diff --git a/2023/07/in.txt b/2023/07/in.txt
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diff --git a/2023/08/8a.c b/2023/08/8a.c
@@ -0,0 +1,35 @@
+#include <inttypes.h>
+#include <math.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 30000
+
+bool isnum(char c) { return c >= '0' && c <= '9'; }
+int index(char *c) { return c[0]-'A' + (c[1]-'A' + (c[2]-'A')*26)*26; }
+
+int map[N][2];
+
+int main() {
+ char *buf, dir[N], line[N];
+ int n, i, s;
+
+ n = strlen(fgets(dir, N, stdin)) - 1;
+
+ fgets(line, N, stdin);
+ while ((buf = fgets(line, N, stdin)) != NULL) {
+ i = index(buf);
+ while (*buf != '(') buf++;
+ map[i][0] = index(buf+1);
+ while (*buf != ' ') buf++;
+ map[i][1] = index(buf+1);
+ }
+
+ for (i = index("AAA"), s = 0; i != index("ZZZ"); s++)
+ i = map[i][dir[s % n] == 'R'];
+
+ printf("%d\n", s);
+ return 0;
+}
diff --git a/2023/08/8b.c b/2023/08/8b.c
@@ -0,0 +1,96 @@
+/*
+I hate this stupid problem. If you read the description carefully (which is
+what I did), you would think that the problem is much, much harder than it
+actually is. In reality, the author made many assumptions about the possible
+paths that made is super easy. Let's see a few:
+
+- Different ghost's path do not end up in the same Z-node (this is not super
+ important for the solution).
+- Each ghost has exactly one Z-node in its path (one could think about this
+ when reading the strange remark that "there are as many A-nodes as Z-nodes",
+ which does not look important at first).
+- Each ghosts meets a Z-node exactly once before entering a loop (this is
+ a fundamental and incredibly strong assupmtion).
+- If a ghost encounters a Z-node after X steps, it will encounter it exactly
+ every X steps (like WTF I don't even have to solve a system of congruences?
+ what is this, a problem for babies?)
+
+Fuck.
+
+This code does not even solve the problem by the way, it computes some data
+about the path that each ghost takes. Then you can figure out the solution
+with a pocket calculator, or by hand.
+*/
+#include <inttypes.h>
+#include <math.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 1000
+
+typedef struct { char last; int next[2]; } node_t;
+typedef struct { int preplen, plen, nz, z[N], zid[N]; } source_t;
+
+int ind(char s[3], char m[][3], int n) {
+ for (int j = 0; j < n; j++)
+ if (s[0] == m[j][0] && s[1] == m[j][1] && s[2] == m[j][2])
+ return j;
+
+ return -1;
+}
+
+int v[N*N];
+source_t worksource(int i, node_t *nodes, char *dir, int n, int k) {
+ source_t s;
+ int state;
+
+printf("Working source %d\n", i);
+
+ memset(v, 0, sizeof(int) * N*N);
+ for (int j = i, d = 0, l = 1; true; d = (d+1)%k) {
+ j = nodes[j].next[dir[d] == 'R'];
+ state = j*k+d;
+if (nodes[j].last == 'Z') printf("Found Z %d at %d\n", j, l);
+ if (v[state]) {
+ s.preplen = v[state]-1;
+ s.plen = l - v[state];
+printf("Stopping at %d. Preperiod: %d, period: %d\n", l, s.preplen, s.plen);
+ return s;
+ } else v[state] = l++;
+ }
+
+ return s;
+}
+
+int main() {
+ node_t nodes[N];
+ source_t src[N];
+ char *buf, dir[N], line[N], name[N][3], lstr[N][3], rstr[N][3];
+ int k, i, n, m, s;
+
+ k = strlen(fgets(dir, N, stdin)) - 1;
+ fgets(line, N, stdin);
+ for (n = 0; (buf = fgets(line, N, stdin)) != NULL; n++) {
+ memcpy(name[n], buf, 3);
+ nodes[n].last = name[n][2];
+ while (*buf != '(') buf++;
+ memcpy(lstr[n], buf+1, 3);
+ while (*buf != ' ') buf++;
+ memcpy(rstr[n], buf+1, 3);
+ }
+
+ for (i = 0; i < n; i++) {
+ nodes[i].next[0] = ind(lstr[i], name, n);
+ nodes[i].next[1] = ind(rstr[i], name, n);
+ }
+
+printf("%d %d\n", n, k);
+
+ for (i = 0, m = 0; i < n; i++)
+ if (nodes[i].last == 'A')
+ src[m++] = worksource(i, nodes, dir, n, k);
+
+ return 0;
+}
diff --git a/2023/08/ex2.txt b/2023/08/ex2.txt
@@ -0,0 +1,10 @@
+LR
+
+OOA = (OOB, XXX)
+OOB = (XXX, OOZ)
+OOZ = (OOB, XXX)
+TTA = (TTB, XXX)
+TTB = (TTC, TTC)
+TTC = (TTZ, TTZ)
+TTZ = (TTB, TTB)
+XXX = (XXX, XXX)
diff --git a/2023/08/in.txt b/2023/08/in.txt
@@ -0,0 +1,752 @@
+LRRLRRLRRLRRRLRRLRRRLRRLRRRLRLRLLRLRLRRLLLRLRLRRRLRRLRLRRRLRRLRRLRRLLLRRLRRRLRRRLRLLRRLRLLRRLRRRLRRLRLRRRLRLRLRRLRLRRRLLRRRLLRRRLRLRRRLRRLLRRLRRRLRRLRRLLRRLRRLRRRLLLRRRLRRLRRLRRLRLRRRLRRLLLLRLRRLRRRLRLLRRLRLLRRLRRRLRRRLRRRLLRRLRRLRRLRRRLRRLRRRLLRLRRRLRRRLRRRLLRRRLRRLRRRR
+
+LRL = (MCG, TRC)
+TNJ = (LMV, PMP)
+GQK = (MGD, DBP)
+KVK = (LHC, NMM)
+PQX = (SLC, LSD)
+GRR = (XCR, BJT)
+RBF = (VDM, BFG)
+TKN = (VDH, HGQ)
+MMJ = (LTR, CNQ)
+CCX = (FJJ, FKD)
+VHD = (JFQ, DDH)
+NRL = (CTM, XTJ)
+SNH = (QDH, PSQ)
+JTM = (VFH, QBR)
+BJT = (GJL, JXD)
+LBJ = (JFQ, DDH)
+FPN = (PBT, SJR)
+CGR = (NJC, CNF)
+RCM = (GTQ, BBT)
+BQQ = (FNS, KPL)
+NSF = (SLD, SJV)
+QFQ = (XNX, GHT)
+QCZ = (JPG, NLJ)
+RJD = (QDT, NSG)
+CNK = (SKK, NFL)
+CBR = (QDT, NSG)
+QMV = (HXG, FHS)
+DNL = (XLX, RDT)
+XRS = (DHT, RDP)
+GHV = (FHS, HXG)
+MJM = (GQB, XCC)
+GQC = (NKG, NSF)
+RKH = (KVG, JCQ)
+DKT = (LTN, LTN)
+THR = (PHF, VKN)
+BQV = (BTS, SCG)
+BJJ = (GQC, QRR)
+CQL = (LHK, BCD)
+LXX = (LCX, FJV)
+NSG = (VSX, DFN)
+LSD = (JRL, KXC)
+QKB = (NLJ, JPG)
+HSK = (CFN, NTM)
+BLL = (JJQ, MSN)
+SQD = (BLK, LBK)
+KVP = (DBB, RHN)
+MLJ = (QQR, HDH)
+QVB = (GMN, TDP)
+HJB = (GPG, XDT)
+NBX = (NVT, SNB)
+CLL = (PLG, LHS)
+AAA = (JXS, MFQ)
+CHN = (RNL, FHV)
+JHT = (JQF, JQX)
+KSB = (VDL, VBD)
+HBT = (CKB, CCX)
+JXH = (MQH, PRD)
+DBB = (XHL, CHN)
+PBD = (RDB, VHH)
+SDV = (VMG, NTV)
+BJS = (NNG, RQH)
+SLM = (BRB, FLG)
+VDH = (QPG, GKG)
+KNS = (VQX, HFR)
+HBF = (RQC, MXC)
+JSF = (KPL, FNS)
+HLS = (TJQ, TKM)
+TRV = (BVN, GKF)
+NLJ = (GBH, JCT)
+SVM = (DKT, XLG)
+THK = (NTM, CFN)
+MDK = (DNL, VXV)
+MHV = (DQQ, MQX)
+CNF = (QQH, SLN)
+XJK = (VFH, QBR)
+FNT = (HXR, HXR)
+KCT = (CPX, FXC)
+BDB = (NMP, JGG)
+LRZ = (JXC, TNJ)
+JBQ = (NDL, KSJ)
+LJQ = (GHT, XNX)
+HKD = (HFH, VHJ)
+VDM = (GTD, HRP)
+QQH = (THC, THR)
+PRD = (KFR, TJK)
+KKH = (VTJ, LSR)
+LQS = (SJQ, RHD)
+RLF = (LCR, SGG)
+JHK = (PDJ, TRV)
+QHG = (VMS, PKS)
+JRL = (GVJ, SKL)
+XDV = (PJL, JRN)
+TSV = (KCR, QJP)
+JSN = (QFQ, LJQ)
+RLA = (JSN, JVD)
+KPD = (RDK, NSS)
+HXP = (RQT, QTS)
+DDB = (SFH, RHV)
+JGG = (BJG, JTS)
+VBD = (SGD, FRJ)
+HRP = (RJD, CBR)
+RRT = (MLJ, MLJ)
+NVD = (KHM, RBF)
+TNK = (QSX, KVD)
+NST = (CDL, VGL)
+FLF = (SNF, KRN)
+LHS = (BSD, DTD)
+NCV = (KSB, PTG)
+FMX = (QKX, XFP)
+KMB = (FDM, BSX)
+CRH = (CVV, DDS)
+VGL = (JLS, CPK)
+DBF = (KGB, PXQ)
+RNM = (HTP, LVL)
+HKC = (XML, RTK)
+JLC = (TKN, VSV)
+FLB = (NNG, RQH)
+QKH = (GQM, LSB)
+DTD = (FTJ, HCK)
+BXS = (HKD, FDK)
+TKV = (RHN, DBB)
+QBJ = (KNS, DXQ)
+LBS = (BHT, SFM)
+VMS = (CTJ, DDC)
+FQJ = (FVQ, GKR)
+RQC = (LRF, HCM)
+SSG = (GQK, HDV)
+KPL = (GQS, MDK)
+GJN = (PNN, CPB)
+LHK = (QPD, GSV)
+KFR = (KPD, DTV)
+QXC = (QVM, BHJ)
+XRH = (PKM, FPN)
+CKL = (BBT, GTQ)
+FPK = (CRV, MGR)
+LTK = (LVT, HXF)
+BLK = (BRT, BQN)
+BSX = (XMS, XJN)
+MMR = (JCG, HHX)
+DVM = (LHK, BCD)
+RCJ = (BDB, CFK)
+QLN = (DDB, LDQ)
+GKF = (QLV, FNP)
+BXQ = (NKT, FFN)
+HCM = (FPK, KQB)
+HKG = (GQK, HDV)
+FNS = (GQS, MDK)
+CTJ = (NST, HDJ)
+QQS = (GQB, XCC)
+ZZZ = (MFQ, JXS)
+MGK = (CRH, BRV)
+LCR = (FRD, KMK)
+BKD = (BNR, BKM)
+LDB = (KLM, SCC)
+PLS = (PBL, CRG)
+FQR = (PNR, NCV)
+TNL = (CDT, MKC)
+KVH = (FJQ, SHJ)
+KPT = (KGB, PXQ)
+GQM = (BXQ, VLP)
+FDR = (GLC, KGF)
+DDC = (NST, HDJ)
+MTJ = (TMT, TMB)
+PBJ = (LTK, VFB)
+JXS = (SBL, CQB)
+XML = (BMK, QBL)
+XSK = (KSN, KSN)
+TKM = (TKQ, NTX)
+XFP = (HBX, RMX)
+DXQ = (VQX, HFR)
+KRN = (CNK, JDM)
+TJQ = (TKQ, NTX)
+VQX = (LBJ, VHD)
+TGX = (HLK, LDJ)
+MCX = (GDH, BNS)
+DKM = (TVC, LPB)
+VXD = (GCF, SVD)
+FGB = (BKM, BNR)
+VNN = (VCS, BSR)
+FXX = (LHC, NMM)
+JKR = (TQN, GXV)
+FRJ = (TDK, PKQ)
+MMQ = (SCC, KLM)
+XGL = (MSN, JJQ)
+GTQ = (DMV, LLK)
+KML = (MCX, CTT)
+LBH = (LSR, VTJ)
+BDS = (XJK, JTM)
+FVH = (TSV, HHC)
+KXN = (LRL, QKK)
+HND = (HNQ, FSG)
+JQS = (QLL, RKH)
+CKD = (TBT, HBT)
+PXP = (NXC, TTK)
+VHP = (QJC, QKH)
+KQL = (BQV, RJR)
+FSG = (JBH, GPH)
+BVN = (QLV, FNP)
+HNV = (XFH, BKL)
+CNJ = (MNT, DCG)
+VSV = (HGQ, VDH)
+PXB = (RRT, RRT)
+FNK = (TKC, LTM)
+VTX = (LDJ, HLK)
+KKG = (QDL, SNT)
+CTT = (GDH, BNS)
+FJJ = (FNT, FNT)
+JCS = (DDB, LDQ)
+GDH = (TPG, DND)
+FMF = (XHB, BNH)
+QLL = (JCQ, KVG)
+NJK = (RDB, VHH)
+LHC = (QDS, SXP)
+QHS = (KQL, SXQ)
+BJQ = (BXB, HQT)
+GJL = (BTX, GJC)
+BNR = (NJK, PBD)
+NFL = (NSC, FTL)
+SKK = (FTL, NSC)
+MQN = (FMF, KPC)
+XHB = (DCS, SQD)
+MDT = (TDP, GMN)
+XBL = (TMT, TMB)
+HFH = (XDV, DMD)
+BSR = (VTX, TGX)
+LDH = (BJQ, XJJ)
+GXX = (KKL, RCJ)
+PQZ = (HDH, QQR)
+CXH = (VXD, SGC)
+HPB = (VHR, FNQ)
+LLF = (QVM, BHJ)
+VQQ = (FQD, MQN)
+GSV = (NDT, SLM)
+GLR = (HVD, DMF)
+SLC = (JRL, KXC)
+RHV = (HBC, TFR)
+PVX = (PLS, SJS)
+LLK = (BDC, PNK)
+SLL = (FJQ, SHJ)
+LKT = (VPF, SSC)
+MXC = (LRF, HCM)
+FTL = (QSR, SVH)
+GCF = (JTF, HJB)
+VHZ = (RRN, TSH)
+LNB = (DQQ, MQX)
+DRQ = (XML, RTK)
+XLG = (LTN, VLD)
+LBL = (VVF, SPR)
+MBB = (NFG, NFG)
+QJC = (GQM, LSB)
+LSR = (BJS, FLB)
+MQH = (TJK, KFR)
+DFN = (LXG, LLL)
+MSN = (KXN, MPV)
+JCT = (MHV, LNB)
+TPG = (CJJ, RRD)
+GCV = (NVT, SNB)
+LNL = (GXX, DJM)
+XFT = (TSH, RRN)
+FSS = (SLC, LSD)
+TKT = (TVC, LPB)
+XBN = (NBX, GCV)
+RQT = (QKF, XRS)
+XCC = (MXL, RLF)
+RTH = (QVB, MDT)
+DBP = (HNV, XCG)
+QQB = (JMF, PBJ)
+KSJ = (NCS, RNM)
+GNQ = (CPX, FXC)
+HHX = (JKT, SVM)
+SGG = (KMK, FRD)
+SMM = (SJS, PLS)
+VPK = (LTM, TKC)
+VLD = (QKB, QCZ)
+LTR = (TFX, FVN)
+VCL = (DKM, TKT)
+HXG = (MTG, SNM)
+KGB = (MRV, LFD)
+JGK = (CNJ, RXF)
+FMV = (FRT, MNF)
+SLD = (KVH, SLL)
+VVL = (TNJ, JXC)
+GDP = (RBF, KHM)
+XDT = (RML, JHK)
+JKP = (NDL, KSJ)
+BNH = (SQD, DCS)
+LFD = (LQC, HLS)
+NHC = (JHT, SSM)
+VPF = (NRN, LBL)
+BHT = (LQS, MCP)
+SNT = (RHL, BDS)
+BQN = (XGL, BLL)
+FVN = (HGP, QKM)
+NXC = (KQJ, FMV)
+NKG = (SJV, SLD)
+HSF = (HPB, NFR)
+QKM = (RRR, PMK)
+PJL = (XBN, PFX)
+MRP = (LCX, FJV)
+XSQ = (FDK, HKD)
+TVC = (GHN, QQC)
+XLX = (DKJ, NNT)
+VSX = (LLL, LXG)
+FQD = (FMF, KPC)
+PNJ = (XCR, BJT)
+QDV = (QRJ, BFS)
+QVG = (GLC, KGF)
+BMK = (RJS, FLF)
+SXQ = (BQV, RJR)
+BGL = (CSB, SBH)
+BJG = (CNH, PQJ)
+RSG = (QFT, VPD)
+VVF = (DRQ, HKC)
+BBT = (LLK, DMV)
+HGQ = (GKG, QPG)
+HMD = (PHT, PCD)
+PPL = (CKL, RCM)
+QLA = (TSH, RRN)
+KBG = (HBT, TBT)
+RHD = (HKG, SSG)
+GQB = (RLF, MXL)
+QFA = (QQR, HDH)
+KPC = (BNH, XHB)
+XNX = (FVH, MNH)
+HBX = (NFD, VJF)
+SVD = (HJB, JTF)
+DMD = (JRN, PJL)
+PKJ = (BJQ, XJJ)
+TFX = (HGP, QKM)
+MCH = (PKD, PFF)
+SGD = (PKQ, TDK)
+RRJ = (KCT, GNQ)
+PJD = (VLM, JJZ)
+PHF = (PQX, FSS)
+PKQ = (NTP, MMR)
+VPD = (QHB, NHC)
+FRD = (GDP, NVD)
+SFH = (HBC, TFR)
+JRN = (XBN, PFX)
+HSB = (MRP, LXX)
+RMX = (NFD, VJF)
+SBH = (JXH, TSQ)
+NTP = (JCG, HHX)
+PSX = (FMX, PCR)
+LCQ = (PKS, VMS)
+LKV = (SMM, PVX)
+SGC = (SVD, GCF)
+CQB = (LDD, QDV)
+FRT = (XCV, HSF)
+KGT = (SGC, VXD)
+TRC = (PSX, NQC)
+BSG = (PKD, PFF)
+CKB = (FJJ, FKD)
+SSM = (JQF, JQX)
+DKJ = (BKD, FGB)
+TKC = (TXS, FQJ)
+JQX = (DVQ, NLN)
+BDC = (KNL, DSV)
+FJV = (MTJ, XBL)
+DND = (CJJ, RRD)
+PPH = (MMQ, LDB)
+FTJ = (LKT, GNX)
+JKV = (RFM, MGK)
+KCR = (LLF, QXC)
+RFN = (LJL, CFX)
+HCF = (NFG, HSR)
+NTV = (JXG, VHP)
+QQR = (DTX, HND)
+BTX = (QVG, FDR)
+JQK = (SXQ, KQL)
+NJC = (SLN, QQH)
+RML = (PDJ, TRV)
+SNF = (JDM, CNK)
+KMK = (GDP, NVD)
+XSH = (DXQ, KNS)
+DTX = (HNQ, FSG)
+BNS = (TPG, DND)
+KHM = (BFG, VDM)
+SBF = (MGK, RFM)
+NFD = (PKJ, LDH)
+BHJ = (VNN, CGL)
+TXS = (FVQ, GKR)
+CRV = (NTQ, SDV)
+GHT = (FVH, MNH)
+RBN = (RQC, MXC)
+KKL = (BDB, CFK)
+NLN = (RBN, HBF)
+QFT = (NHC, QHB)
+QBL = (FLF, RJS)
+RHG = (PNN, CPB)
+MNF = (XCV, HSF)
+SJS = (CRG, PBL)
+FDK = (VHJ, HFH)
+HXM = (JJD, JJD)
+PNN = (QDK, MMJ)
+GCS = (TTK, NXC)
+VJF = (LDH, PKJ)
+GTD = (CBR, RJD)
+RRD = (TPL, XVR)
+JXC = (LMV, PMP)
+NXH = (MKC, CDT)
+HCK = (GNX, LKT)
+BRC = (QLL, RKH)
+KQB = (CRV, MGR)
+TMB = (MCH, BSG)
+XJN = (RSX, JGK)
+HQP = (SFM, BHT)
+HQT = (MBB, HCF)
+THC = (VKN, PHF)
+TPL = (NGD, QQB)
+NGD = (PBJ, JMF)
+GVJ = (RNT, LKV)
+QDK = (LTR, CNQ)
+JXG = (QKH, QJC)
+TQN = (KRL, QCV)
+RDB = (JQS, BRC)
+MPV = (LRL, QKK)
+SJQ = (HKG, SSG)
+XHL = (RNL, FHV)
+LRF = (KQB, FPK)
+GNX = (SSC, VPF)
+VXV = (XLX, RDT)
+MTG = (CCR, CRR)
+NFG = (BHH, BHH)
+DSV = (PXB, PJN)
+CVT = (KPT, DBF)
+RHL = (JTM, XJK)
+CBQ = (GXL, PQB)
+BHH = (JXS, MFQ)
+DMV = (BDC, PNK)
+NSS = (HQP, LBS)
+FVM = (PRP, RFN)
+NCS = (HTP, LVL)
+QPD = (NDT, SLM)
+GJC = (FDR, QVG)
+CFK = (JGG, NMP)
+HDV = (MGD, DBP)
+PNB = (PQB, GXL)
+RXA = (NLJ, JPG)
+CNH = (JSF, BQQ)
+VXL = (HXR, XQQ)
+QKF = (RDP, DHT)
+QTS = (QKF, XRS)
+VDL = (SGD, FRJ)
+FCM = (TQN, GXV)
+BHQ = (GQC, QRR)
+BSD = (FTJ, HCK)
+CJJ = (TPL, XVR)
+PLG = (DTD, BSD)
+LQC = (TKM, TJQ)
+NTM = (KLG, PPL)
+SHJ = (NRL, NMS)
+QDL = (BDS, RHL)
+PCR = (XFP, QKX)
+XCG = (XFH, BKL)
+LMV = (GCS, PXP)
+JJD = (QQV, QQV)
+HGP = (PMK, RRR)
+TNF = (RQT, QTS)
+SFM = (MCP, LQS)
+MNR = (RFN, PRP)
+LLL = (CBQ, PNB)
+RJS = (SNF, KRN)
+BRV = (CVV, DDS)
+GGK = (LHS, PLG)
+HVD = (GBJ, VQQ)
+KQJ = (FRT, MNF)
+PMK = (CGR, PQR)
+MFB = (GGK, CLL)
+HLK = (NTG, KMB)
+BKL = (CQL, DVM)
+SVT = (CSB, SBH)
+FGD = (PNR, NCV)
+LVT = (VCL, XTQ)
+MFQ = (SBL, CQB)
+SCC = (KKH, LBH)
+JMF = (VFB, LTK)
+GLC = (FBS, DNB)
+HFT = (MMQ, LDB)
+PNR = (PTG, KSB)
+SNM = (CRR, CCR)
+TJK = (DTV, KPD)
+PQR = (NJC, CNF)
+VPM = (QDL, SNT)
+DHT = (KGT, CXH)
+RPK = (KML, XRL)
+VFH = (HSB, QBV)
+FNP = (JBQ, JKP)
+JLS = (QLN, JCS)
+XMS = (JGK, RSX)
+FRK = (GGK, CLL)
+PDJ = (GKF, BVN)
+QDH = (JLC, QTG)
+PFX = (GCV, NBX)
+BXB = (MBB, MBB)
+TTK = (KQJ, FMV)
+PKS = (DDC, CTJ)
+KLG = (RCM, CKL)
+CSV = (QVB, MDT)
+NNG = (DXR, BPD)
+HHC = (KCR, QJP)
+LVL = (CSQ, TKJ)
+QHB = (JHT, SSM)
+JDM = (SKK, NFL)
+JCQ = (TNK, LPJ)
+TSQ = (MQH, PRD)
+JTS = (PQJ, CNH)
+RCR = (KCT, GNQ)
+LXG = (CBQ, PNB)
+TKQ = (HXP, TNF)
+PKM = (PBT, SJR)
+GXV = (QCV, KRL)
+HJS = (BBX, RPK)
+CPX = (XSK, XSK)
+JXD = (BTX, GJC)
+CVV = (HXM, VDB)
+SBL = (LDD, QDV)
+HBC = (VPM, KKG)
+DXR = (CVT, KKS)
+VDB = (JJD, BVS)
+XQQ = (VVL, LRZ)
+PQB = (BXS, XSQ)
+NTX = (HXP, TNF)
+SCG = (VMQ, HJS)
+GHN = (SBF, JKV)
+VXR = (SGL, LMC)
+NQF = (VPD, QFT)
+DDS = (HXM, VDB)
+KLM = (LBH, KKH)
+SGL = (QRL, KLQ)
+GKR = (CSV, RTH)
+QDT = (DFN, VSX)
+MNT = (SNH, FPP)
+TDP = (TKV, KVP)
+KNL = (PXB, PXB)
+GMN = (KVP, TKV)
+MXL = (SGG, LCR)
+PKD = (FXX, KVK)
+SXP = (FNK, VPK)
+NTG = (BSX, FDM)
+QSR = (KBG, CKD)
+FHV = (XCL, MBP)
+RDT = (NNT, DKJ)
+SPR = (HKC, DRQ)
+FFN = (JHD, GLR)
+FBS = (QXL, FTF)
+VLP = (FFN, NKT)
+KXC = (SKL, GVJ)
+TKJ = (FQR, FGD)
+LHH = (PHT, PCD)
+CTM = (GHV, QMV)
+VHH = (JQS, BRC)
+MQX = (MJM, QQS)
+BBX = (XRL, KML)
+LKK = (PKM, FPN)
+RNT = (PVX, SMM)
+JSA = (TNJ, JXC)
+RDK = (LBS, HQP)
+RXF = (MNT, DCG)
+HDH = (HND, DTX)
+VKN = (FSS, PQX)
+LSB = (VLP, BXQ)
+BPD = (CVT, KKS)
+TMT = (BSG, MCH)
+QLV = (JBQ, JKP)
+LPJ = (KVD, QSX)
+QDS = (VPK, FNK)
+GQS = (VXV, DNL)
+DTV = (NSS, RDK)
+SNB = (JLB, LLV)
+NMM = (SXP, QDS)
+CSB = (TSQ, JXH)
+PFF = (FXX, KVK)
+VHJ = (XDV, DMD)
+XFX = (KSN, THB)
+CCR = (NQF, RSG)
+VMQ = (BBX, RPK)
+HXR = (VVL, VVL)
+SJV = (KVH, SLL)
+CFN = (KLG, PPL)
+DDH = (RHG, GJN)
+FLG = (HMD, LHH)
+FVQ = (RTH, CSV)
+RTK = (BMK, QBL)
+NSC = (SVH, QSR)
+MKC = (FCM, JKR)
+XTJ = (GHV, QMV)
+CNQ = (FVN, TFX)
+SJR = (BJJ, BHQ)
+MGR = (NTQ, SDV)
+XFH = (DVM, CQL)
+QSX = (GRR, PNJ)
+QKX = (HBX, RMX)
+LBK = (BQN, BRT)
+PXQ = (MRV, LFD)
+LDQ = (SFH, RHV)
+MNH = (HHC, TSV)
+XCV = (HPB, NFR)
+KLQ = (QBJ, XSH)
+FTF = (SCQ, RGC)
+JJQ = (MPV, KXN)
+LJL = (VDV, SJJ)
+DNB = (FTF, QXL)
+CFX = (VDV, SJJ)
+JKT = (DKT, DKT)
+SJJ = (THK, HSK)
+CDL = (JLS, CPK)
+QCV = (XRH, LKK)
+XCR = (GJL, JXD)
+KMJ = (MLJ, PQZ)
+MPS = (DJM, GXX)
+GBJ = (MQN, FQD)
+PNK = (KNL, DSV)
+BRB = (HMD, LHH)
+PBT = (BJJ, BHQ)
+JPG = (JCT, GBH)
+HSR = (BHH, ZZZ)
+DQQ = (QQS, MJM)
+MCP = (SJQ, RHD)
+LTM = (TXS, FQJ)
+KKS = (KPT, DBF)
+DCG = (FPP, SNH)
+TDK = (MMR, NTP)
+QJP = (LLF, QXC)
+NFR = (FNQ, VHR)
+FKD = (FNT, VXL)
+LMC = (KLQ, QRL)
+PBL = (FVM, MNR)
+JHD = (DMF, HVD)
+CRR = (RSG, NQF)
+JJZ = (JVD, JSN)
+RQH = (DXR, BPD)
+HXF = (VCL, XTQ)
+CRG = (MNR, FVM)
+VHR = (QHG, LCQ)
+VCS = (VTX, TGX)
+FPP = (QDH, PSQ)
+KSN = (XFT, XFT)
+BVS = (QQV, PJD)
+RSX = (RXF, CNJ)
+FXC = (XSK, XFX)
+HDJ = (CDL, VGL)
+QQC = (SBF, JKV)
+LPB = (GHN, QQC)
+LRJ = (QHS, JQK)
+SCQ = (RCR, RRJ)
+PQJ = (JSF, BQQ)
+GKG = (VMJ, LRJ)
+SSC = (NRN, LBL)
+NVT = (JLB, LLV)
+KVD = (GRR, PNJ)
+XRL = (CTT, MCX)
+BTS = (VMQ, HJS)
+KRL = (XRH, LKK)
+RRN = (BGL, SVT)
+FHS = (SNM, MTG)
+QPG = (VMJ, LRJ)
+QKK = (TRC, MCG)
+VDV = (THK, HSK)
+GPH = (VXR, GKQ)
+RNL = (XCL, MBP)
+SLN = (THC, THR)
+CPB = (MMJ, QDK)
+NMS = (XTJ, CTM)
+RJR = (BTS, SCG)
+CGL = (VCS, BSR)
+MBP = (MFB, FRK)
+NNT = (FGB, BKD)
+HTP = (CSQ, TKJ)
+GPG = (RML, JHK)
+QRL = (QBJ, XSH)
+BCD = (GSV, QPD)
+QQV = (VLM, VLM)
+PRP = (CFX, LJL)
+TFR = (KKG, VPM)
+LDD = (QRJ, BFS)
+QVM = (VNN, CGL)
+KGF = (FBS, DNB)
+GBH = (MHV, LNB)
+JCG = (JKT, SVM)
+FJQ = (NMS, NRL)
+QXL = (RGC, SCQ)
+NRN = (SPR, VVF)
+FDM = (XMS, XJN)
+RFM = (BRV, CRH)
+NKT = (GLR, JHD)
+HFR = (VHD, LBJ)
+THB = (XFT, VHZ)
+XJJ = (BXB, HQT)
+QTG = (VSV, TKN)
+NQC = (PCR, FMX)
+JLB = (HFT, PPH)
+GXL = (BXS, XSQ)
+PSQ = (QTG, JLC)
+NDT = (BRB, FLG)
+PJN = (RRT, KMJ)
+TBT = (CKB, CCX)
+JBH = (GKQ, VXR)
+XVR = (QQB, NGD)
+BRT = (XGL, BLL)
+PCD = (MPS, LNL)
+SKL = (RNT, LKV)
+TSH = (BGL, SVT)
+JQF = (DVQ, NLN)
+DVQ = (RBN, HBF)
+RGC = (RCR, RRJ)
+QRJ = (TNL, NXH)
+XCL = (MFB, FRK)
+VLM = (JSN, JVD)
+RDP = (KGT, CXH)
+VTJ = (FLB, BJS)
+LCX = (XBL, MTJ)
+JVD = (QFQ, LJQ)
+BKM = (NJK, PBD)
+VMJ = (QHS, JQK)
+DMF = (VQQ, GBJ)
+CDT = (FCM, JKR)
+NTQ = (NTV, VMG)
+QRR = (NSF, NKG)
+NDL = (RNM, NCS)
+KVG = (LPJ, TNK)
+DCS = (BLK, LBK)
+JFQ = (RHG, GJN)
+GKQ = (SGL, LMC)
+JTF = (GPG, XDT)
+SVH = (CKD, KBG)
+RRR = (PQR, CGR)
+RHN = (CHN, XHL)
+HNQ = (GPH, JBH)
+BFG = (GTD, HRP)
+LLV = (PPH, HFT)
+NMP = (BJG, JTS)
+CSQ = (FQR, FGD)
+MRV = (HLS, LQC)
+LDJ = (KMB, NTG)
+PHT = (LNL, MPS)
+DJM = (RCJ, KKL)
+PTG = (VBD, VDL)
+PMP = (PXP, GCS)
+LTN = (QKB, QKB)
+BFS = (NXH, TNL)
+MGD = (XCG, HNV)
+QBV = (MRP, LXX)
+VFB = (LVT, HXF)
+XTQ = (TKT, DKM)
+QBR = (QBV, HSB)
+CPK = (QLN, JCS)
+MCG = (NQC, PSX)
+VMG = (VHP, JXG)
+FNQ = (LCQ, QHG)
diff --git a/2023/09/9a.c b/2023/09/9a.c
@@ -0,0 +1,46 @@
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 1000
+
+#define isnum(c) (c == '-' || (c >= '0' && c <= '9'))
+
+int64_t readl(int64_t nums[], char *buf) {
+ int64_t i;
+ for (i = 0; *buf; buf++) {
+ if (!isnum(*buf)) continue;
+ nums[i++] = atoll(buf);
+ while (isnum(*buf)) buf++;
+ }
+ return i;
+}
+
+bool isconstant(int64_t a[], int n) {
+ for (int i = 0; i < n-1; i++)
+ if (a[i] != a[i+1])
+ return false;
+ return true;
+}
+
+int64_t next(int64_t a[], int64_t n) {
+ int64_t x = a[n-1];
+ if (isconstant(a, n))
+ return x;
+ for (int i = 0; i < n-1; i++)
+ a[i] = a[i+1] - a[i];
+ return x + next(a, n-1);
+}
+
+int main() {
+ char line[N];
+ int64_t s, a[N];
+
+ for (s = 0; fgets(line, N, stdin) != NULL; )
+ s += next(a, readl(a, line));
+
+ printf("%" PRId64 "\n", s);
+ return 0;
+}
diff --git a/2023/09/9b.c b/2023/09/9b.c
@@ -0,0 +1,46 @@
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 1000
+
+#define isnum(c) (c == '-' || (c >= '0' && c <= '9'))
+
+int64_t readl(int64_t nums[], char *buf) {
+ int64_t i;
+ for (i = 0; *buf; buf++) {
+ if (!isnum(*buf)) continue;
+ nums[i++] = atoll(buf);
+ while (isnum(*buf)) buf++;
+ }
+ return i;
+}
+
+bool isconstant(int64_t a[], int n) {
+ for (int i = 0; i < n-1; i++)
+ if (a[i] != a[i+1])
+ return false;
+ return true;
+}
+
+int64_t next(int64_t a[], int64_t n) {
+ int64_t x = a[0];
+ if (isconstant(a, n))
+ return x;
+ for (int i = 0; i < n-1; i++)
+ a[i] = a[i+1] - a[i];
+ return x - next(a, n-1);
+}
+
+int main() {
+ char line[N];
+ int64_t s, a[N];
+
+ for (s = 0; fgets(line, N, stdin) != NULL; )
+ s += next(a, readl(a, line));
+
+ printf("%" PRId64 "\n", s);
+ return 0;
+}
diff --git a/2023/09/in.txt b/2023/09/in.txt
@@ -0,0 +1,200 @@
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+14 28 47 71 102 153 266 539 1162 2462 4957 9419 16946 29043 47712 75551 115862 172768 251339 357727 499310
+19 22 38 89 208 457 958 1941 3833 7447 14380 27796 53861 104226 200137 378978 704206 1279303 2264473 3888958 6437241
+20 38 83 177 353 665 1204 2120 3650 6152 10145 16355 25767 39683 59786 88210 127616 181274 253151 348005 471485
+18 33 52 75 103 147 258 596 1573 4137 10313 24197 53757 114135 233848 466630 914030 1767831 3387708 6439669 12137157
+16 32 61 98 136 164 171 173 281 836 2678 7743 20501 51456 125378 299753 704238 1621680 3648963 8007452 17127734
+0 9 25 62 141 293 566 1037 1844 3286 6097 12096 25583 56164 124287 271914 582905 1221701 2506400 5046590 10003946
+-4 12 56 141 280 486 772 1151 1636 2240 2976 3857 4896 6106 7500 9091 10892 12916 15176 17685 20456
diff --git a/2023/10/10a.c b/2023/10/10a.c
@@ -0,0 +1,76 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 1000
+
+typedef enum { EAST, SOUTH, WEST, NORTH } direction_t;
+
+int main() {
+ char map[N][N];
+ int i, j, k, n, s;
+ direction_t dir;
+
+ for (n = 0; fgets(map[n], N, stdin) != NULL; n++) ;
+
+ for (i = 0; i < n; i++)
+ for (j = 0; map[i][j]; j++)
+ if (map[i][j] == 'S')
+ goto found_s;
+
+found_s:
+ if (map[i][j+1] == '7' || map[i][j+1] == '-' || map[i][j+1] == 'J') {
+ j++;
+ dir = EAST;
+ goto found_direction;
+ }
+ if (map[i+1][j] == 'L' || map[i+1][j] == '|' || map[i+1][j] == 'J') {
+ i++;
+ dir = SOUTH;
+ goto found_direction;
+ }
+ if (j > 0 && (map[i][j-1] == 'L' || map[i][j-1] == '-' || map[i][j-1] == 'F')) {
+ j--;
+ dir = WEST;
+ goto found_direction;
+ }
+
+found_direction:
+ for (k = 1; map[i][j] != 'S'; k++) {
+ switch (map[i][j]) {
+ case '|':
+ if (dir == SOUTH) i++;
+ if (dir == NORTH) i--;
+ break;
+ case '-':
+ if (dir == EAST) j++;
+ if (dir == WEST) j--;
+ break;
+ case '7':
+ if (dir == EAST) { i++; dir = SOUTH; }
+ if (dir == NORTH) { j--; dir = WEST; }
+ break;
+ case 'F':
+ if (dir == WEST) { i++; dir = SOUTH; }
+ if (dir == NORTH) { j++; dir = EAST; }
+ break;
+ case 'J':
+ if (dir == EAST) { i--; dir = NORTH; }
+ if (dir == SOUTH) { j--; dir = WEST; }
+ break;
+ case 'L':
+ if (dir == WEST) { i--; dir = NORTH; }
+ if (dir == SOUTH) { j++; dir = EAST; }
+ break;
+ default:
+ printf("Error: dead path\n");
+ return 1;
+ }
+ }
+
+ s = (k+1)/2;
+
+ printf("%d\n", s);
+ return 0;
+}
diff --git a/2023/10/10b.c b/2023/10/10b.c
@@ -0,0 +1,156 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 1000
+#define set(i, j, c) if (newmap[i][j] == '.') newmap[i][j] = c;
+
+typedef enum { EAST, SOUTH, WEST, NORTH } direction_t;
+
+char map[N+2][N+2], newmap[N+2][N+2];
+int n, si, sj, count[26] = {0};
+direction_t sdir;
+
+void printmap(char m[][N+2]) {
+ for (int i = 1; i < n; i++) {
+ for (int j = 1; m[i][j] != 'B'; j++)
+ printf("%c", m[i][j]);
+ printf("\n");
+ }
+}
+
+void color_rl(direction_t dir, int i, int j) {
+ switch (dir) {
+ case EAST:
+ set(i-1, j, 'L');
+ set(i+1, j, 'R');
+ break;
+ case SOUTH:
+ set(i, j+1, 'L');
+ set(i, j-1, 'R');
+ break;
+ case WEST:
+ set(i-1, j, 'R');
+ set(i+1, j, 'L');
+ break;
+ case NORTH:
+ set(i, j+1, 'R');
+ set(i, j-1, 'L');
+ break;
+ default:
+ break;
+ }
+}
+
+direction_t firstdir(int i, int j) {
+ if (map[i][j+1] == '7' || map[i][j+1] == '-' || map[i][j+1] == 'J')
+ return EAST;
+ if (map[i+1][j] == 'L' || map[i+1][j] == '|' || map[i+1][j] == 'J')
+ return SOUTH;
+ return WEST;
+}
+
+void advance(int *i, int *j, direction_t dir) {
+ if (dir == EAST) { (*j)++; }
+ else if (dir == SOUTH) { (*i)++; }
+ else if (dir == WEST) { (*j)--; }
+ else (*i)--;
+}
+
+direction_t newdir(int i, int j, direction_t dir) {
+ switch (map[i][j]) {
+ case '|':
+ case '-':
+ return dir;
+ case '7':
+ if (dir == EAST) return SOUTH;
+ if (dir == NORTH) return WEST;
+ case 'F':
+ if (dir == WEST) return SOUTH;
+ if (dir == NORTH) return EAST;
+ case 'J':
+ if (dir == EAST) return NORTH;
+ if (dir == SOUTH) return WEST;
+ case 'L':
+ if (dir == WEST) return NORTH;
+ if (dir == SOUTH) return EAST;
+ default:
+ printf("Error: dead path at (%d, %d)\n", i, j);
+ exit(1);
+ }
+ return EAST;
+}
+
+void walk_and_color_rl(char c) {
+ int i = si, j = sj;
+ direction_t dir = sdir;
+
+ newmap[i][j] = c;
+ color_rl(dir, i, j);
+ advance(&i, &j, dir);
+ for (; map[i][j] != 'S'; advance(&i, &j, dir)) {
+ newmap[i][j] = c;
+ color_rl(dir, i, j);
+ dir = newdir(i, j, dir);
+ color_rl(dir, i, j);
+ }
+ color_rl(dir, i, j);
+}
+
+void fill(int i, int j, char c) {
+ if (newmap[i][j] != '.' && newmap[i][j] != 'R' && newmap[i][j] != 'L')
+ return;
+
+ newmap[i][j] = c;
+ count[c-'a']++;
+ fill(i, j+1, c);
+ fill(i, j-1, c);
+ fill(i+1, j, c);
+ fill(i-1, j, c);
+}
+
+int main() {
+ /* Get input */
+ for (n = 1; fgets(&map[n][1], N, stdin) != NULL; n++) ;
+
+ /* Add borders, copy to newmap */
+ for (int i = 0; i < N+2; i++) {
+ for (int j = 0; j < N+2; j++) {
+ newmap[i][j] = map[i][j];
+ if (map[i][j] == 0 || map[i][j] == '\n')
+ newmap[i][j] = map[i][j] = 'B';
+ }
+ }
+
+ /* Find S and set the initial direction */
+ for (si = 1; si < n; si++)
+ for (sj = 1; map[si][sj] != 'B'; sj++)
+ if (map[si][sj] == 'S')
+ goto found_s;
+
+found_s:
+ /* Set the initial direction and walk the path mark it with X */
+ sdir = firstdir(si, sj);
+ walk_and_color_rl('X');
+
+ /* Replace the unnecessary pipe symbols with dots */
+ for (int i = 1; i < N; i++)
+ for (int j = 1; map[i][j] != 'B'; j++)
+ if (newmap[i][j] != 'X')
+ newmap[i][j] = '.';
+
+ /* Walk again the path and mark adjacent dots left and right */
+ walk_and_color_rl('Y');
+
+ /* Mark the remaining dots left and right */
+ for (int i = 1; i < n; i++)
+ for (int j = 1; newmap[i][j] != 'B'; j++)
+ if (newmap[i][j] == 'R' || newmap[i][j] == 'L')
+ fill(i, j, newmap[i][j] + 'a' - 'A');
+
+ printmap(newmap);
+ printf("r: %d\nl: %d\n", count['r'-'a'], count['l'-'a']);
+ printf("Check with the map printed above which one is 'inside'\n");
+ return 0;
+}
diff --git a/2023/10/in.txt b/2023/10/in.txt
@@ -0,0 +1,140 @@
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+F7FJ.LF-7JJ||.JF-J-7F-FLJJ|F7JFL|LJ.|.|7LFF-J|J-L7LJFJF||.F.FFJFF7L7.L-JF7.FLL-FJ-J7F|L-7|F7.7-|.J7|F-7LJ|FFL7J-77||LF-JJ|L7JLLJLL--F7|.LFFJ
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+||FJ--.F-7FL7JJL7.|JL-LF777FFF7|-FJJ.L||--JF7JLL|777LL-.|FLL|.|J.|L|-L7.LFL7-JF7F77..L7F7JF7|L77JLFJJ.L7|LLJJJLFJFJJ.JJJ.L7.||FLFFF7F|FJ-||F
+||JJF|-J7L|.LJ7..-J.|JL||F7F7JFF-7J.7|F7J-L|J-|-J7-7-|.FFL7LJ77|FJ7|JLJL--.||L|FFJ--LLJJFF|LJFJ77.||..F7J7FF|L7JF|J777|-|JJF|J7.L|.|FLF7FFJ|
+|J|-|7JF77L-|JF-7J-7J-||LJLJL--7.|FF77|||..LF7-7L77F--L77L|FF|L77LFF-7JJFLFF7|F7-J-LF|7F-7L-7|7F7.F77F-7FL|77F7LFJ-JFLJFJJ-LJJ|L.|FF-7FL7JFJ
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diff --git a/2023/11/11a.c b/2023/11/11a.c
@@ -0,0 +1,39 @@
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 1000
+
+#define ABS(a) ((a)>0 ? (a) : -(a))
+
+uint8_t dr[N], dc[N];
+int64_t i, j, k, n, p, g[N*N][2];
+
+int main() {
+ char line[N];
+ for (i = 0; fgets(line, N, stdin) != NULL; i++) {
+ for (j = 0; line[j] != '\n'; j++) {
+ if (line[j] == '#') {
+ g[n][0] = i;
+ g[n++][1] = j;
+ dr[i] = dc[j] = 1;
+ }
+ }
+ }
+
+ for (k = 1; k < i; k++) dr[k] += dr[k-1];
+ for (k = 1; k < j; k++) dc[k] += dc[k-1];
+
+ for (i = 0; i < n; i++) {
+ g[i][0] += g[i][0] - dr[g[i][0]];
+ g[i][1] += g[i][1] - dc[g[i][1]];
+ }
+
+ for (i = 0; i < n; i++)
+ for (j = i+1; j < n; j++)
+ p += ABS(g[i][0] - g[j][0]) + ABS(g[i][1] - g[j][1]);
+
+ printf("%" PRId64 "\n", p);
+ return 0;
+}
diff --git a/2023/11/11b.c b/2023/11/11b.c
@@ -0,0 +1,39 @@
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define N 1000
+
+#define ABS(a) ((a)>0 ? (a) : -(a))
+
+uint8_t dr[N], dc[N];
+int64_t i, j, k, n, p, g[N*N][2];
+
+int main() {
+ char line[N];
+ for (i = 0; fgets(line, N, stdin) != NULL; i++) {
+ for (j = 0; line[j] != '\n'; j++) {
+ if (line[j] == '#') {
+ g[n][0] = i;
+ g[n++][1] = j;
+ dr[i] = dc[j] = 1;
+ }
+ }
+ }
+
+ for (k = 1; k < i; k++) dr[k] += dr[k-1];
+ for (k = 1; k < j; k++) dc[k] += dc[k-1];
+
+ for (i = 0; i < n; i++) {
+ g[i][0] += 999999 * (g[i][0] - dr[g[i][0]]);
+ g[i][1] += 999999 * (g[i][1] - dc[g[i][1]]);
+ }
+
+ for (i = 0; i < n; i++)
+ for (j = i+1; j < n; j++)
+ p += ABS(g[i][0] - g[j][0]) + ABS(g[i][1] - g[j][1]);
+
+ printf("%" PRId64 "\n", p);
+ return 0;
+}
diff --git a/2023/11/in.txt b/2023/11/in.txt
@@ -0,0 +1,140 @@
+...#...........#..............#..................................................#...................#...................#..................
+................................................................................................#..............#...........................#
+..................................#...................#.......................................................................#.............
+.......................#....................................................................#...............................................
+........#........................................................#.......#..................................................................
+..............................................#............#......................................................#.........................
+...............#.....................#...............................#...........................#..........................#...............
+....#...........................#................................................#.......................#..........................#.......
+............................................................................................................................................
+......................................................................................#......#..............................................
+............#.......#.......................#.....#...........#.............................................................................
+.........................#..................................................................................................................
+................................................................................................................#...........................
+..............................#.......#............................................................#.................#.................#....
+............................................................................................#...............................................
+.............................................................#.......#............#.......................#..............#.................#
+.......#....................................................................................................................................
+...............................................................................................................................#............
+...............#............#......#...........................................#.......#....................................................
+.........................................#................#.......#............................#.....#......................................
+...................................................#...................................................................#....................
+..............................................#.................................................................#..................#........
+...................#.......................................................................#................................................
+.#......................................................................#...................................................................
+.......................#.....#............#................#......................#.............................................#...........
+...............#....................#.......................................#................................#...........................#..
+............................................................................................................................................
+....................#................................................#...........................#.................#........................
+...........#....................................#...................................#.......#.........#.....................................
+..#...................................................#..................#.................................................................#
+..................................#...............................#........................................................#................
+..........................................................................................................#.................................
+......................................................................#.................#.......#.....................#.....................
+.......................................#..........#.........................................................................................
+......#........................#..................................................#.........................................................
+....................#.................................#................................................#.................................#..
+...........#...................................................................................................#............#...............
+...................................#.............................#.............#.................#.................................#........
+.............................#..........................................................#.................#..........#......................
+........................#................#..................#..................................................................#............
+...................#.....................................................#.......................................#..........................
+...................................................#.................................#...................................#..................
+..........#.............................................................................................#...................................
+......................................#.........................................#................#.....................................#....
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+........................#..........................................................................................#........#...............
+.#...............................................#..........................................#.........#....................................#
+.............................#.............#..........#.....................................................................................
+..............#...................#..............................................#........................#.................................
+....................#.................................................#.....................................................................
+.................................................................................................#................................#.........
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+................#..........................................#.......#.....................#...............................#...............#..
+.....#................#.....................................................................................................................
+#...............................................#............................................#.............#....................#...........
+..........#.................#.............#............#....................................................................................
+.....................................................................................#......................................................
+..................#.................#....................................#......................#....................#......................
+.............................................................#................................................#.............................
+................................#.............#...................................#.......#.................................................
+.....................................................................#.........................................................#............
+...........#.........................................................................................#......................................
+.....................#..............................#.........................#.....................................................#.......
+..............................#.....#.......#.............................................................#.................................
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+................#...............................................#................................................................#..........
+#...........................................................................................#........................#......................
+..........................#.....#...........................................................................................................
+.........................................................#................#.............................................................#...
+......#............................................................................#........................................................
+.........................................#.........................................................#..........#.............................
+.....................#....................................................................#...............................#.................
+..................................................................................................................................#.........
+............#......................#.............................#.......#..................................................................
+...........................................................#...................#.............#........#....................................#
+#.......................................#........#..............................................................#...........................
+.................#..................................................................#.......................................................
+......................................................................................................................#.................#...
+............................................................................................................................................
+................................................................#.............................................#.............................
+......#.........................#........#............................#.........................................................#...........
+............................................................................................................................................
+.....................................................#.............................................#........................................
+.............#..........#.................................#........#........................................................................
+...................#.........................................................#.................#............#........................#......
+.............................................#.........................................#....................................................
+............................................................................................................................................
+.#.........#..........................................#....................................#................................................
+.................#...................#...................................#...............................#.......................#..........
+.......#..............#........#...................................................................................#........................
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+.........................................#.............................................................................#....................
+...#.....................#......................#............................#..............................................................
+...................................#..................................#......................#..............................#...............
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+...............................#...........#................#....................#........................................................#.
+..........................................................................................................#.................................
+...........................#......................................#....................................................#............#.......
+...#.....#...............................................#................#...................#..................#..........................
+.............................................#................................................................................#.............
+...............#........#...................................................................................................................
+....................................#................#...............#.................#..........#.........................................
+..........................................#........................................................................#........................
+...........................#.....................#....................................................#.....................................
+.................................#.............................................................................................#............
+.........#.....................................................#...............................#............................................
+.............................................#............................#.............................................#................#..
+#..........................................................#........................#.......................................................
+.............#.......#................................................#.......#...................#................#........................
+..........................#................................................................................#................................
+.......................................#.......................................................................................#............
+......................................................................................#.....................................................
+.......................#.....#......................#...............................................................................#......#
+........#....................................#............#.............#...................................................#...............
+.................#................................................#...........#........................................#....................
+...........................................................................................#......#.........................................
+.#....................................#.........#...........................................................................................
+.......................................................#................................................#........#..............#...........
+...........#................................................................................................................................
+..................................................................................#.............#.....................#.....................
+............................................................#..............................................#........................#.......
+..#................................#.......#..................................#.............................................................
+.......................#.............................................................#.....#...............................................#
+.........#..........................................#..........................................................#............................
+................#........................................#...........................................#................................#.....
+...............................#........#.........................#.............#...........................................................
+.............................................#....................................................................#.............#...........
+....................................#........................#......................#...........#.......................#...................
+...................#.............................#.......................................#..................................................
+.............#..........................................................#...................................................................
+........#..................................................................................................#................................
+............................................................................................................................#............#..
+#........................................#......................#..................................................#................#.......
+.....................#.............#.....................#............................#.........#...........................................
+.....#.....................#................................................................................................................
+.........................................................................#..................................................................
+.............#...............................................#....................#..................................#........#.............
+........................#...........................#....................................................#..................................
+........................................#........................#...............................#.............#..........#..........#......
+..#.......................................................#...................#.............#...............................................
diff --git a/2023/README.md b/2023/README.md
@@ -0,0 +1,18 @@
+# Advent of Code 2023
+
+This is my first year trying the AoC. I decided to use C because it is the
+language I know the best and I am familiar with the standard library.
+
+## Instructions
+
+Compile with `-std=c99` and other required options, for example
+
+```
+$ cc -std=c99 -lm 06/6a.c
+```
+
+My solutions read from stdin, so run the e.g. with
+
+```
+$ ./a.out <in.txt
+```
diff --git a/README.md b/README.md
@@ -0,0 +1,3 @@
+My solutions for the [Advent of Code](https://adventofcode.com).
+
+See `year/README.md` for instructions.
