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butypair.cpp
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butypair.cpp
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#include <bits/stdc++.h>
using namespace std;
#define lli long long int
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
// #ifndef ONLINE_JUDGE
// freopen("input.txt", "r", stdin);
// freopen("output.txt", "w", stdout);
// #endif
lli t, z;
cin >> t;
for (z = 1; z <= t; z++)
{
long long int n;
cin >> n;
vector<lli> counter(1000005,0);
long long int array[n];
for (int i = 0; i < n; i++)
{
cin >> array[i];
counter[array[i]] = counter[array[i]] + 1;
}
long long int sum = n;
long long int ans = 0;
sort(array, array + n);
for (int i = 0; i < n;)
{
int count = counter[array[i]];
sum = sum - count;
ans = ans + count * (sum);
i=i+count;
}
cout << ans*2 << endl;
}
return 0;
}