This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int n, a[5000110];
int main () {
    ios_base::sync_with_stdio(false); cin.tie(0);
    cin >> n;
    bool y = 1;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
        if (i > 1 and a[i] < a[i - 1]) y = 0;
    }
    if (y) cout << "0\n";
    else cout << "-1\n";
return 0;}
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