秒

#include<iostream>
#include<cmath>
#define MAXN (50+5)
#define fastcio ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
using namespace std;
int a[MAXN];
int main(){
    fastcio
    int t;
    cin>>t;
    while(t--){
        int n;
        cin>>n;
        for(int i=1;i<=n;i++){
            cin>>a[i];
        }
        int minn=abs(a[1]-a[2]),nimt;
        for(int i=1;i<=n;i++){
            for(int j=i+1;j<=n;j++){
                nimt=abs(a[i]-a[j]);
                minn=min(minn,nimt);
            }
        }
        cout<<minn<<endl;
    }
    return 0;
}