【題目敘述】https://zerojudge.tw/ShowProblem?problemid=b298
#include <iostream>
#include <queue>
#include <vector>
#include <cstring>
using namespace std;
vector <int> v[10005];
int a[10005];
queue <int> q;
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
int n, m, l, Q, b, c;
while (cin >> n >> m >> l >> Q){
memset(a, 0, sizeof(a));
for (int i = 1; i <= n; i++){
v[i].clear();
}
for (int i = 0; i < m; i++){
cin >> b >> c;
v[b].push_back(c);
}
for (int i = 0; i < l; i++){
cin >> b;
a[b] = -1;
q.push(b);
}
while (!q.empty()){
b = q.front();
q.pop();
for (int i:v[b]){
if (a[i] == 0){
a[i] = -1;
q.push(i);
}
}
}
for (int i = 0; i < Q; i++){
cin >> b;
if (a[b] == 0) cout << "YA~~\n";
else cout << "TUIHUOOOOOO\n";
}
}
}