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day 21 part 1

main
magical 2023-12-21 05:20:42 +00:00
parent f3b38a3ece
commit 52a2184a3c
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import sys
from collections import defaultdict
map = [x.strip() for x in sys.stdin]
print(map)
Y = len(map)
X = len(map[0])
assert all(len(row) == X for row in map)
grid = {}
#start = None
#for i, row in enumerate(map):
# for j,c in enumerate(row):
# if c in "#.":
# pass
# elif c == "S":
# start = (i,j)
# else:
# raise Exception("invalid char %s at (%s,%s)" % (c, i, j))
# grid[i,j] = d
#print(grid)
def solve(grid):
import numpy
fill = numpy.zeros((Y,X+1), dtype='uint8')
mask = numpy.zeros((Y,X+1), dtype='uint8')
for i, row in enumerate(map):
for j, c in enumerate(row):
if c == '#':
mask[i,j] = 1
if c == 'S':
start = (i,j)
def draw(fill):
for i, row in enumerate(fill):
print("".join(".O#"[f + 2*mask[i,j]] for j,f in enumerate(row)))
fill[start] = 1
# flood fill
for i in range(64):
draw(fill)
old = fill
fill = numpy.zeros(fill.shape, dtype='uint8')
for i in range(Y):
f = (old[i] == 1)
f = numpy.roll(f, 1) | numpy.roll(f, -1)
if i > 0: f |= (old[i-1] == 1)
if i < Y-1: f |= (old[i+1] == 1)
f[-1] = False
f &= (mask[i] == 0)
#print(old, f)
if f.any():
fill[i, f] = 1
draw(fill)
print(numpy.sum(fill))
solve(grid)