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A_Great_Graphs.cpp
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A_Great_Graphs.cpp
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/*
///////// ///// //// ///
// // // // // // //
////// // // // // //
// // /// // // //
//////// // // // //
*/
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
#define Fast \
ios_base::sync_with_stdio(false); \
cin.tie(NULL); \
cout.tie(0);
#define rep(i, s, n) for (ll i = s; i < n; i++)
#define For(i, s, l) for (ll i = l; i >= s; i--)
#define mod 1000000007
#define deb(x) cout << #x << "=" << x << endl
#define deb2(x, y) cout << #x << "=" << x << ", " << #y << "=" << y << endl
#define umap unordered_map
#define pb(x) push_back(x)
#define all(x) (x).begin(), (x).end()
#define lb() lower_bound()
#define ub() upper_bound()
#define S second
#define F first
#define PI 3.14159265358979323846
#define bits_all_odds 0X55555555
#define bits_all_even 0XAAAAAAAA
#define setBit(x) builtin_popcount(x)
#define fix(num, dig) cout << fixed << setprecision(dig) << num
//fill(all(vec), 1);to fill vector with a number
//if (S.count(key)) returns 1 if set or map contain key else return 0
const int N = 1000010;
vector<ll> is_prime(N + 1, true);
void seive_of_eras(ll n)
{
is_prime[0] = 0;
is_prime[1] = 0;
for (ll i = 2; i * i <= n; i++)
{
if (is_prime[i])
{
for (ll j = i * i; j <= n; j += i)
{
is_prime[j] = false;
}
}
}
}
ll nCr(ll n, ll r)
{
r = min(r, n - r);
if (r < 0)
return 0;
if (r == 0)
return 1;
ll ans = 1;
for (ll i = 1; i <= r; i++)
{
ans = ans * (n - i + 1) / i;
}
return ans;
}
ll logn(int val, int base) { return (val > base - 1) ? 1 + logn(val / base, base) : 0; }
//ll logn(int val, int base) { return (base > val - 1) ? 1 + logn(base / val, val) : 0; }
ll power(ll a, ll b)
{
if (b == 1)
return a;
if (b == 0)
return 1;
ll m1 = power(a, b / 2);
if (b % 2)
return m1 * m1 * a;
return m1 * m1;
}
bool isprime(ll a)
{
if (a <= 1)
return false;
if (a == 2 || a == 3)
return true;
if (a % 2 == 0 || a % 3 == 0)
return false;
for (ll i = 5; i * i <= a; i = i + 6)
{
if (a % i == 0 || a % (i + 2) == 0)
return false;
}
return true;
}
template <typename T>
void init(T *temp, T num, int n)
{
for (int i = 0; i < n; i++)
temp[i] = num;
}
/*********************/ /*********************/ /*********************/ /*********************/ //
void solve()
{
ll n;
cin>>n;
vl a(n);
rep(i,0,n)
cin>>a[i];
sort(all(a));
ll sum=a[n-1];
ll pre=0;
rep(i,1,n)
{
ll x=pre+i*(a[i]-a[i-1]);
sum-=x;
pre=x;
}
cout<<sum<<endl;
}
signed main()
{
Fast
ll t;
// #ifndef ONLINE_JUDGE
// freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
// #endif
t = 1;
cin >> t;
for (int i = 1; i <= t; i++)
{
// cout << "Case #" << i << ": ";
solve();
}
return 0;
}