Add day 8 solution

day-13/day-13.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+from pathlib import Path
+
+
+def fold(i, dots):
+    new_dots = []
+    if i[0] == 'x':
+        for d in dots:
+            n = (i[1] - abs(d[0] - i[1]), d[1])
+            if d[0] != i[1] and n not in new_dots:
+                new_dots.append(n)
+    elif i[0] == 'y':
+        for d in dots:
+            n = (d[0], i[1] - abs(d[1] - i[1]))
+            if d[1] != i[1] and n not in new_dots:
+                new_dots.append(n)
+
+    return new_dots
+
+
+def part_1(input):
+    result = 0
+    dots = []
+    instructions = []
+    for line in input:
+        if ',' in line:
+            x, y = line.strip().split(',')
+            dots.append((int(x), int(y)))
+        elif 'fold along' in line:
+            d, c = line.strip().split()[-1].split('=')
+            instructions.append([d, int(c)])
+    dots = fold(instructions.pop(0), dots)
+    result = len(dots)
+    print("Part 1 result:", result)
+
+
+def part_2(input):
+    result = 0
+    dots = []
+    instructions = []
+    for line in input:
+        if ',' in line:
+            x, y = line.strip().split(',')
+            dots.append((int(x), int(y)))
+        elif 'fold along' in line:
+            d, c = line.strip().split()[-1].split('=')
+            instructions.append([d, int(c)])
+
+    while len(instructions):
+        dots = fold(instructions.pop(0), dots)
+    max_x = 0
+    max_y = 0
+    for d in dots:
+        max_x = max(max_x, d[0] + 1)
+        max_y = max(max_y, d[1] + 1)
+    for y in range(max_y):
+        for x in range(max_x):
+            if (x, y) in dots:
+                print('#', end='')
+            else:
+                print('.', end='')
+        print()
+    print("Part 2 result:", result)
+
+
+input = list()
+p = Path(__file__).with_name('input.txt')
+with open(p) as f:
+    input = f.readlines()
+    part_1(input)
+    part_2(input)