From: Mart Lubbers <mart@martlubbers.net>
Date: Wed, 15 Dec 2021 14:29:40 +0000 (+0100)
Subject: add some comments
X-Git-Url: https://git.martlubbers.net/?a=commitdiff_plain;h=cbabfe67e29d6bff028fd13e1867332a00e46b84;p=advent21.git

add some comments
---

diff --git a/15b.c b/15b.c
index 26881a3..029d305 100644
--- a/15b.c
+++ b/15b.c
@@ -15,11 +15,9 @@ int maxy = 0;
 
 int get_grid(int x, int y)
 {
-	if (x == 0 && y == 0)
-		return 0;
 	int r = grid[y%maxy][x%maxx] + y/maxy + x/maxx;
-	while (r > 9)
-		r -= 9;
+	if (r > 9)
+		return r % 9;
 	return r;
 }
 
@@ -73,6 +71,7 @@ int main()
 				int alt = dist[u.y][u.x] + get_grid(v->key.x, v->key.y);
 				if (alt < dist[v->key.y][v->key.x]) {
 					dist[v->key.y][v->key.x] = alt;
+					//Reinsert with in correct position
 					HASH_DELETE(hh, q, v);
 					HASH_ADD_INORDER(hh, q, key, sizeof(struct point), v, qcmp);
 				}