func_code_string: #include <bits/stdc++.h>   using namespace std;   int m[10000000];   int func(int v) {     int r = 1;     while (v != 1) {       if (v % 2 == 0) {         v /= 2;       } else {         v--;         r++;       }     }     return r;   }   int main() {     int n, a;     long long r = 0;     scanf( %d , &n);     for (int i = 0; i < n; i++) {       scanf( %d , &a);       m[func(a)]++;     }     for (int i = 0; i < 10000000; i++) {       r += (long long)(((long long)m[i] * (long long)(m[i] - 1)) / 2);     }     cout << r;     return 0;   }   