Submission #2714904

---

Source Code Expand

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

int main() {
    int N;
    cin >> N;
    vector<int> a(N);
    for (int i = 0; i < N; i++)
    {
        cin >> a[i];
    }
    int index = 1, num = 0;
    while(1)
    {
        index = a[index - 1];
        if(index == 2)
        {
            cout << num + 1;
            return 0;
        }
        if(num > 100000)
        {
            cout << -1;
            return 0;
        }
        num++;
    }
}

Submission Info

Judge Result