func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 2 * 1e6;   int a[N];   int main() {     std::ios::sync_with_stdio(false);     int n;     cin >> n;     for (int i = 0; i < n; ++i) {       int tmp;       cin >> tmp;       a[tmp]++;     }     int res = 0;     for (int i = 0; i < N; ++i) {       if (a[i] % 2) ++res;       a[i + 1] += (a[i] / 2);     }     cout << res << endl;     return 0;   }   