Submission #3450740

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Source Code Expand

#include <iostream>
using namespace std;

int main() {
	int N, a[100000][2] = {}, ans = 0, tmp = 0;
	cin >> N;
	for (int i = 0; i < N; ++i) cin >> a[i][0];
	for (int i = 0; a[i][0] != 2; ++ans) {
		if (a[i][1] == 1) {
			tmp = 1;
			break;
		}
		a[i][1] = 1;
		i = a[i][0] - 1;
	}
	if (tmp == 0) cout << ans + 1;
	else cout << -1;
}

Submission Info

Judge Result