Added solutions for 15, 16, 17, 18 and 19

1 files changed, 21 insertions, 0 deletions

diff --git a/2023/15/15a.c b/2023/15/15a.c
new file mode 100644
index 0000000..16a8fec
--- /dev/null
+++ b/2023/15/15a.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+#define N 100000
+
+char *b, line[N];
+int c, s;
+
+int main() {
+        fgets(line, N, stdin);
+
+        for (b = line, c = 0, s = 0; *b; b++) {
+                if (*b == ',' || *b == '\n') {
+                        s += c;
+                        c = 0;
+                } else
+                        c = (c + (int)*b) * 17 % 256;
+        }
+
+        printf("%d\n", s);
+        return 0;
+}