Do day 3 and 4 for 2025

2025/d04.py

@@ -0,0 +1,32 @@
+from lib import get_data, Grid2D
+
+data = get_data(__file__)
+g = Grid2D(data)
+
+r = 0
+adjs = []
+for pos in g.all_coords():
+    if g[pos] != "@":
+        continue
+    nr_of_rolls_adj = len([nb for nb in g.neighbors_adj(pos) if g[nb] == "@"])
+    if nr_of_rolls_adj < 4:
+        r += 1
+        adjs.append(pos)
+print(r)
+
+r = 0
+while True:
+    adjs = []
+    for pos in g.all_coords():
+        if g[pos] != "@":
+            continue
+        nr_of_rolls_adj = len([nb for nb in g.neighbors_adj(pos) if g[nb] == "@"])
+        if nr_of_rolls_adj < 4:
+            adjs.append(pos)
+    if adjs:
+        r += len(adjs)
+        for a in adjs:
+            g[a] = "."
+    else:
+        break
+print(r)