2023 - Day 11 part 1

2023/11/11.py

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+#!/usr/bin/env python
+# 2023 - Advent Of Code 11
+
+# file = 'input_example.txt'
+file = 'input.txt'
+
+# pylint: disable=consider-using-with
+input_lines = [line.strip('\n') for line in open(file, encoding="utf-8")]
+print(f'map: ({len(input_lines[0])}, {len(input_lines)})')
+
+# find empty lines
+empty_lines = []
+for y, _ in enumerate(input_lines):
+    if '#' not in input_lines[y]:
+        empty_lines.append(y)
+print(f'empty lines: {empty_lines}')
+
+# find empty columns
+empty_columns = []
+for x in range(0, len(input_lines[0])):
+    empty = True
+    for y, _ in enumerate(input_lines):
+        if input_lines[y][x] == '#':
+            empty = False
+            break
+    if empty:
+        empty_columns.append(x)
+print(f'empty columns: {empty_columns}')
+
+# expand lines
+eline = "".join(['.'] * len(input_lines[0]))
+offset = 0
+for l in empty_lines:
+    input_lines.insert(l+offset, eline)
+    offset += 1
+
+# expand columns
+offset = 0
+for c in empty_columns:
+    for y, line in enumerate(input_lines):
+        s = line[:c+offset] + '.' + line[c+offset:]
+        input_lines[y] = s
+    offset += 1
+
+stars = []
+for y, _ in enumerate(input_lines):
+    for x, _ in enumerate(_):
+        if input_lines[y][x] == '#':
+            stars.append((x, y))
+print(f'stars: {len(stars)}, extended map: ({len(input_lines[0])}, {len(input_lines)})')
+
+# for y in range(0, len(input_lines)):
+#     for x in range(0, len(input_lines[y])):
+#         print(input_lines[y][x], end='')
+#     print()
+
+paths = []
+for s1 in stars:
+    for s2 in stars:
+        if s1 != s2 and {s1, s2} not in paths:
+            paths.append({s1, s2})
+print(f'number of paths: {len(paths)}')
+
+# dist = math.abs(x2-x1) + math.abs(y2-y1)
+path_sum = 0
+for path in paths:
+    p = list(path)
+    dist = abs(p[0][0] - p[1][0]) + abs(p[0][1] - p[1][1])
+    path_sum += dist
+    # print(f'{path} dist: {dist}')
+
+print(f'{path_sum=}')

2023/11/input.txt

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2023/11/input_example.txt

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+..........
+.......#..
+#...#.....