AC了前三题 1. # 豆油瓶 import collections n = int(input()) a = [] for i in range(n): a.append(list(map(int, input().split()))) dic = collections.defaultdict(list) for i in range(n): for j in range(n): if a[i][j]>=3 and i!=j: dic[i].append(j) used = [False]*n cnt = 0 def d...