func_code_string: #include <bits/stdc++.h>   using namespace std;   void task();   int main() {     srand(time(0));     task();     return 0;   }   const int INF = 0x3f3f3f3f;   const int N = 1e6 + 10;   const int M = 1e7 + 100;   const int OLOLO = 0xFFFFFFFF;   int n, k;   long long int cnt[N];   set<int> vals;   long long int ans;   vector<int> masks;   void task() {     cin >> n >> k;     for (int i = 0; i < n; ++i) {       int a;       cin >> a;       ++cnt[a];       vals.insert(a);     }     for (int i = 0; i < (1 << 14); ++i) {       if (__builtin_popcount(i) == k) {         masks.push_back(i);       }     }     for (int val : vals) {       for (int mask : masks) {         int result = val & (mask ^ OLOLO);         result |= (val ^ OLOLO) & mask;         if (result < N) {           if (val == result) {             ans += cnt[val] * (cnt[val] - 1);           } else {             ans += cnt[val] * cnt[result];           }         }       }     }     cout << ans / 2;   }   