Advent of Code 2021 Python Solution: Day 11

adj = [(i,j) for i in range(-1, 2) for j in range(-1,2) if i!=0 or j!=0] window = {(i,j):darr[i][j] for i in range(10) for j in range(10)} flashes = 0 i=0 previous = set() while len(previous)<len(window): previous = set() window = {k:v+1 for k, v in window.items()} while True: if sum(v>9 for k,v in window.items() if k not in previous)==0: break for k,v in window.items(): if k not in previous and v>9: previous.add(k) for ad in [(k[0]+i,k[1]+j) for i,j in adj if (k[0]+i,k[1]+j) in window]: window[ad]+=1 flashes+=len(previous) window.update({k:0 for k in previous}) i+=1 if i==100: print(f"Part 1: {flashes}") print(f"Part 2: {i}")