ABC118 B - Foods Loved by Everyone - 競プロ

ABC118 B - Foods Loved by Everyone

https://atcoder.jp/contests/abc118/tasks/abc118_b

提出

code: python

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

a = list(map(int,input().split())) for _ in range(n)

likes = 0 * m

for i in a:

for j in range(1, i0+1):

likes[ij-1] += 1

ans = 0

for i in likes:

if (i == n):

ans += 1

print(ans)