From bc79fa83d3cb63d8445312b47dbed9295809b28a Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Thu, 4 Dec 2025 06:34:16 +0100
Subject: Day 4 2025

---
 2025/04/a.py | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

(limited to '2025/04/a.py')

diff --git a/2025/04/a.py b/2025/04/a.py
index 5fdb11b..a693841 100644
--- a/2025/04/a.py
+++ b/2025/04/a.py
@@ -1,6 +1,21 @@
 import fileinput
 
+def neigh(a, i, j):
+	return [
+		a[i-1][j-1], a[i-1][j], a[i-1][j+1],
+		a[i][j-1],              a[i][j+1],
+		a[i+1][j-1], a[i+1][j], a[i+1][j+1],
+	].count('@')
+
+s = 0
 with fileinput.input() as lines:
+	a = [['.'] * 200]
 	for line in lines:
-		...
+		a.append(['.'] + list(line.replace('\n', '.')))
+	a.append(['.'] * 200)
 
+for i in range(1,len(a)-1):
+	for j in range(1,len(a[1])-1):
+		if a[i][j] == '@' and neigh(a, i, j) < 4:
+			s += 1
+print(s)
-- 
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