advent2023

commit dee410a39093919a0c2ea665f5694daf13f66c05
parent a224a07f453aba7ecedadc5ed4bef17202ec9702
Author: bsandro <email@bsandro.tech>
Date:   Wed, 10 Jan 2024 22:11:18 +0200

day 10 p2 finally solved

Diffstat:
M
day10/puzzle.c
 | 
55
+++++++++++++++++++++++++++++++++++++++----------------

1 file changed, 39 insertions(+), 16 deletions(-)
diff --git a/day10/puzzle.c b/day10/puzzle.c
@@ -180,19 +180,31 @@ int traverse(Map *map, Pos start, Map *loop) {
 }
 
 /*
-
 | -> |,F,L
 L -> J
 F -> 7
 7 -> |,F,L
  */
-bool is_wall_closing(char cur, char prev) {
+bool is_wall_toggles(char cur, char prev) {
+	if (cur=='-') return false;
+	//if (cur=='|') return prev!=0;
+
 	if (cur=='J') return prev=='L';
+	if (cur=='L') return prev=='J';
+
 	if (cur=='7') return prev=='F';
-	if (cur=='|' /*||
-		cur=='F' ||
-		cur=='L'*/) return prev=='|'||prev=='7';
+	if (cur=='F') return prev=='7';
 
+	return false; //prev=='|';
+}
+
+/*
+F -> J
+L -> 7
+ */
+bool is_wall_continues(char cur, char prev) {
+	if (cur=='J') return prev=='F';
+	if (cur=='7') return prev=='L';
 	return false;
 }
 
@@ -205,18 +217,29 @@ int calc_area(Map *loop) {
 		for (int x=0; x<loop->w; ++x) {
 			char sym = loop->area[loop->w*y+x];
 			char prev = stack_last(&walls);
-			if (is_wall_closing(sym, prev)) {
-				stack_pop(&walls);
-				is_open = false;
-				printf("[%d] wall closed from %c to %c (%d)\n", y, prev, sym, is_open);
-			} else if (sym!='.'&&sym!='-'&&!is_open) {
-				stack_push(&walls, sym);
-				is_open = true;
-				printf("[%d] wall opened from %c to %c (%d)\n", y, prev, sym, is_open);
+
+			if (sym=='.') {
+			 	if (is_open) {
+					loop->area[loop->w*y+x] = 'I';
+					area++;
+				}
+				continue;
 			}
-			if (sym=='.' && is_open) {
-				loop->area[loop->w*y+x] = 'I';
-				area++;
+
+			if (is_wall_continues(sym, prev)) {
+				//printf("[%2d:%2d] wall continues from %c to %c (%d)\n", y, x, prev, sym, is_open);
+				//stack_pop(&walls);
+				//prev = stack_pop(&walls);
+				stack_push(&walls, sym);
+				//is_open = !is_open;
+			} else if (sym!='-') {
+				is_open = !is_open;
+				stack_push(&walls, sym);
+				if (is_open) {
+					printf("[%2d:%2d] wall opened from %c to %c (%d)\n", y, x, prev, sym, is_open);
+				} else {
+					printf("[%2d:%2d] wall closed from %c to %c (%d)\n", y, x, prev, sym, is_open);
+				}
 			}
 		}
 	}