Day 05

day05/part1.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+import re
+from collections import defaultdict
+
+lines = (x.strip() for x in open("input.txt"))
+points = defaultdict(int)
+
+for line in lines:
+    [x1, y1, x2, y2] = list(map(int, re.match(r"(\d+),(\d+) -> (\d+),(\d+)", line).groups()))
+    if x1 == x2:
+        for y in range(min(y1, y2), max(y1, y2)+1):
+            key = '{},{}'.format(x1, y)
+            points[key] = points[key] + 1
+    elif y1 == y2:
+        for x in range(min(x1, x2), max(x1, x2)+1):
+            key = '{},{}'.format(x, y1)
+            points[key] = points[key] + 1
+
+print(sum(1 if val >= 2 else 0 for val in points.values()))