From 554ad47f09974f0131df285fda8ea50a1fdad8f5 Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Mon, 11 Dec 2023 15:14:47 +0100
Subject: Initial commit, some solutions

---
 2023/03/3a.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 2023/03/3a.c

(limited to '2023/03/3a.c')

diff --git a/2023/03/3a.c b/2023/03/3a.c
new file mode 100644
index 0000000..13c8c8d
--- /dev/null
+++ 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;
+}
-- 
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