Untitled

#include<bits/stdc++.h>

using namespace std;

#define ll long long

ll minDiffPairValue(vector<ll> &arr,int n)
{
    int i;
    ll mn=LLONG_MAX;
    
    for(i = 0; i < n-1; i++)
    {
        mn=min(mn,abs(arr[i]-arr[i+1]));
    }       
    return mn;
}

void solution(vector<ll> &array, int operation) {
    int i;
    ll diff;

    for (i = 0; i < operation; i++) {
        diff = minDiffPairValue(array, array.size());
        array.push_back(diff);
    }
    cout << diff << endl;
}
int main()
{
    int numberOfTests;
    int n; // lenght of array
    int operations; // number of operation 
    int i, j;
    ll key;
    vector<ll> array;

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> numberOfTests;
    for (i = 0; i < numberOfTests; i++) {
        cin >> n;
        cin >> operations;
        array.clear();
        for(j = 0; j < n; j++) {
            cin >> key;
            array.push_back(key);
        }
        solution(array, operations);
    }

    return 0;
}