#include <bits/stdc++.h>
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define i64 long long
#define endl '\n'
#define lb(x) ((x) & (-x))
using namespace std;
const i64 mod = 1e15+7;
const int maxn = 1e3+10;

signed main()
{
    IOS;
    int t; cin >> t;
    while(t--)
    {
        int n; cin >> n;
        vector<int> a(n+1);
        i64 sum = 0;
        for(int i = 1; i <= n; ++i) cin >> a[i],sum += a[i];
        sum /= n;
        i64 ans = 0;
        for(int i = 1; i <= n; ++i) if(a[i] > sum) ans += a[i] - sum;
        cout << ans << endl;
    }
    return 0;
}