diff --git a/d11.py b/d11.py new file mode 100755 index 0000000..402aab9 --- /dev/null +++ b/d11.py @@ -0,0 +1,46 @@ +#!/usr/bin/env python3 + +from sys import argv + +i = [list(x.strip()) for x in open(argv[1])] +w = len(i[0]) +h = len(i) + +d = ( + (-1,-1), (-1, 0), (-1,+1), + ( 0,-1), ( 0,+1), + (+1,-1), (+1, 0), (+1,+1) +) + +def f(p2): + o = i + while True: + n = [[None]*w for x in range(h)] + for y, iy in enumerate(o): + for x, c in enumerate(iy): + a = 0 + for v in d: + cy = y+v[0] + cx = x+v[1] + while cy >= 0 and cx >= 0 and cy < h and cx < w: + cc = o[cy][cx] + if cc == "#": + a += 1 + break + if cc == "L" or not p2: + break + cy += v[0] + cx += v[1] + if c == "L" and a == 0: + n[y][x] = "#" + continue + if c == "#" and a >= (4 if not p2 else 5): + n[y][x] = "L" + continue + n[y][x] = c + if str(n) == str(o): + return n + o = n + +print(sum(x.count("#") for x in f(False))) +print(sum(x.count("#") for x in f(True))) diff --git a/d11_input.txt b/d11_input.txt new file mode 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