問題：B - Foods Loved by Everyone #include <iostream> #include <vector> using namespace std; #define REP(i, n) for (int i = 0; i < (n); ++i) int main(void) { int n, m, k, a, ans = 0; cin.tie(0); ios::sync_with_stdio(false); cin >> n >> m; vector<int> cnt(m, 0); </int></vector></iostream>…