Submission #2532031

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;

int main () {

    int N;
    cin >> N;

    int a, b;
    cin >> a >> b;

    int K;
    cin >> K;

    vector<int> P(K);
    for (int i = 0; i < K; i++) {
        cin >> P[i];
    }

    vector<bool> visited(N + 1, false);
    visited[a] = true;
    visited[b] = true;

    string ans = "YES";
    for (int i = 0; i < K; i++) {
        if (visited[P[i]]) {
            ans = "NO";
            break;
        }
        visited[P[i]] = true;
    }

    cout << ans << endl;

    return 0;
}

Submission Info

Judge Result