（觉得有用就点赞）

#include <iostream>
#include <bits/stdc++.h>

using namespace std;

int main() {
int T;
cin >> T;

while (T--) {
    int n;
    cin >> n;
    
    vector<int> s(n);
    for (int i = 0; i < n; i++)  {
        cin >> s[i];
    }
    
    
    sort(s.begin(), s.end());
    int min_diff = 1000;  
    for (int i = 0; i < n - 1; i++) {
        min_diff = min(min_diff, s[i+1] - s[i]);
    }
    
    cout << min_diff << endl;
}

return 0;

}