Day 13

day13/part1.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+
+lines = (x.strip() for x in open("input.txt"))
+points = set()
+# 1311,895
+
+for line in lines:
+    if line.startswith("fold along x="):
+        mark = int(line[13:])
+        points = set((x if mark > x else 2*mark-x, y) for x, y in points if mark != x)
+        break
+    elif line.startswith("fold along y="):
+        mark = int(line[13:])
+        points = set((x, y if mark > y else 2*mark-y) for x, y in points if mark != y)
+        break
+    elif len(line) > 0:
+        points.add(tuple(int(num) for num in line.split(",")))
+
+print(len(points))