advent2021

commit 51c0568fca5e7912677c7c770332129e643c0230
parent c2f92267749224cda5d4854ba1a4820306753202
Author: bsandro <[email protected]>
Date:   Sat, 11 Dec 2021 11:49:19 +0200

Day 11, puzzle 2

Diffstat:
M
day11/puzzle.c
 | 
18
++++++++++++------

1 file changed, 12 insertions(+), 6 deletions(-)
diff --git a/day11/puzzle.c b/day11/puzzle.c
@@ -7,6 +7,7 @@
 #include <strings.h>
 #include <assert.h>
 #include <ctype.h>
+#include <limits.h>
 
 #include "util.h"
 
@@ -48,15 +49,20 @@ void puzzle(const char *filename, long long *result1, long long *result2) {
 		bzero(buf, STR_LEN);
 	}
 
-	int flashes = 0;
-
-	for (int s = 1; s <= STEPS; ++s) {
+	for (int s = 1; s < INT_MAX; ++s) {
 		step(&octopuses);
-		flashes += normalize(&octopuses);
+		int flashes = normalize(&octopuses);
+		if (s <= STEPS) {
+			*result1 += flashes;
+		}
+		if (flashes == GRID_WIDTH*GRID_HEIGHT) {
+			*result2 = s;
+		}
+		if (*result1 > 0 && *result2 > 0) {
+			break;
+		}
 	}
 
-	*result1 = flashes;
-
 	// mutiny! ignoring feof/ferror.
 	fclose(infile);
 }