func_code_string: #include <bits/stdc++.h>   using namespace std;   bool comp(int x, int y) { return x > y; }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     ;     int t = 1;     cin >> t;     long long m, n, k;     string a, b;     while (t--) {       cin >> n;       vector<long long> vec(n);       for (long long i = 0; i < n; i++) cin >> vec[i];       map<long long, long long> mp;       for (long long i = 0; i < n; i++) {         long long k = (long long)(log2(vec[i]));         mp[k] += 1;       }       map<long long, long long>::iterator it = mp.begin();       long long ans = 0;       while (it != mp.end()) {         ans += ((it->second) * (it->second - 1)) / 2;         ++it;       }       cout << ans <<   n ;     }   }   