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c_cpp
a year ago
601 B
4
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#include <bits/stdc++.h>

using i64 = long long;

void solve() {
    int n;
    std::cin >> n;
    
    std::vector<int> a(n);
    for (int i = 0; i < n; i++) {
        std::cin >> a[i];
    }
    
    auto it = std::min_element(a.begin(), a.end());
    if (std::is_sorted(it, a.end())) {
        std::cout << it - a.begin() << "\n";
    } else {
        std::cout << -1 << "\n";
    }
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    int t;
    std::cin >> t;
    
    while (t--) {
        solve();
    }
    
    return 0;
}
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