advent2025

commit eea5ba992ac288b358d5bfb4e78780e24fdfe134
parent e5244a3f8e25b183fe488c44e752b9f745390f40
Author: bsandro <email@bsandro.tech>
Date:   Sun,  7 Dec 2025 08:53:45 +0200

day07

Diffstat:
A
day07.c
 | 
30
++++++++++++++++++++++++++++++

1 file changed, 30 insertions(+), 0 deletions(-)
diff --git a/day07.c b/day07.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+#include <inttypes.h>
+#include "cputime.h"
+
+#define W 144
+#define H 144
+
+int main(void) {
+    int x = 1;
+    int64_t beams[W] = {0};
+    int p1 = 0;
+    for (int c=getchar();c!=EOF;c=getchar()) {
+        if (c=='\n') {
+            x = 1;
+        } else {
+            if (c=='^' && beams[x]!=0) {
+                beams[x-1] += beams[x];
+                beams[x+1] += beams[x];
+                beams[x] = 0;
+                p1++;
+            }
+            if (c=='S') beams[x] = 1;
+            x++;
+        }
+    }
+    int64_t p2 = 0;
+    for (int i=0;i<W;++i) p2 += beams[i];
+    printf("p1: %d\np2: %"PRIi64"\n", p1, p2);
+    return 0;
+}