ABC289 C - Coverage

提出

code: python

import itertools

n, m = list(map(int, input().split()))

s = []

for _ in range(m):

c = int(input())

a = list(map(int, input().split()))

s.append(set(a))

ans = 0

new_s = set()

for i in range(m):

res = True

for j in range(1, n+1):

if j not in new_s:

res = False

break

if res:

ans += 1

print(ans)