#include<bits/stdc++.h> using namespace std; int main() { int C; cin >> C; for (int i = 0; i < C; i++) { int n; cin >> n; vector<int> numbers(n); for (int j = 0; j < n; j++) { cin >> numbers[j]; } int result = findSecondSmallest(numbers); if (result == -1) { cout << "NO" << endl; } else { cout << result << endl; } } return 0; }