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1360B.cpp
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//<<<<<<<<<<<<<Tushars_07>>>>>>>>>>>>>>>>
#include<bits/stdc++.h>
using namespace std;
#define lli long long int
#define ll long long
#define no cout<<"NO \n";
#define yes cout<<"YES \n";
#define test lli trtyuio ; cin>>trtyuio; while(trtyuio--)
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL);
test{
int n ;
cin >> n ;
vector<int> arr ;
for(int i = 0 ; i<n ; i++){
int a ;
cin >> a ;
arr.push_back(a);
}
sort(arr.begin(),arr.end());
int min = INT_MAX ;
for(int i = 0 ; i<arr.size()-1 ; i++){
if((arr[i+1]-arr[i])<min)
min = arr[i+1]-arr[i] ;
}
cout<<min<<endl ;
}
return 0;
}
//<<<<<<<<<<Tushars_07>>>>>>>>>>>>>>>>