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6.py
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import math
import collections
from collections import Counter
import re
TEST = """
....#.....
.........#
..........
..#.......
.......#..
..........
.#..^.....
........#.
#.........
......#...
"""
PROD = """
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........#................#..............................#..#......................................................................
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"""
x = TEST
x = PROD
x = x.strip()
# Data in differnt formats for quick access
text = x
lines = x.split("\n")
grid = [list(line) for line in lines]
guard_pos = None
for i in range(len(grid)):
for j in range(len(grid[i])):
if grid[i][j] == "^":
guard_pos = (i, j)
grid[i][j] = "."
break
if guard_pos:
break
print()
inital_pos = guard_pos
# from tqdm import tqdm
looped = set()
for i in range(len(grid)):
for j in range(len(grid[i])):
if grid[i][j] == ".":
# ok wehat if we block this?
grid[i][j] = "#"
guard_pos = inital_pos
walked = set()
cdir = (-1, 0)
while True:
x, y = guard_pos
tmp = guard_pos + cdir
if tmp in walked:
looped.add((i, j))
break
walked.add(tmp)
nx, ny = x + cdir[0], y + cdir[1]
# if out of bounds
if nx < 0 or nx >= len(grid) or ny < 0 or ny >= len(grid[0]):
break
# if wall
if grid[nx][ny] == "#":
# turn right
cdir = (cdir[1], -cdir[0])
continue
else:
# move forward
guard_pos = (nx, ny)
continue
grid[i][j] = "."
# c = Counter(walked)
# print(len(walked))
print(len(looped))