func_code_string: #include <bits/stdc++.h>   using namespace std;   multiset<long long> h[1000005];   int main() {     int q;     scanf( %d , &q);     while (q--) {       char op, s[20];       long long a;       scanf(  %c , &op);       if (op ==  + ) {         scanf( %lld , &a);         int idx = 0, k = 0;         for (long long x = a; x > 0; x /= 10, k++) {           int d = x % 10;           idx |= (d & 1) << k;         }         h[idx].insert(a);       } else if (op ==  - ) {         scanf( %lld , &a);         int idx = 0, k = 0;         for (long long x = a; x > 0; x /= 10, k++) {           int d = x % 10;           idx |= (d & 1) << k;         }         h[idx].erase(h[idx].find(a));       } else {         scanf( %s , s);         reverse(s, s + strlen(s));         int idx = 0;         for (int k = 0; s[k]; k++) idx |= (s[k] -  0 ) << k;         printf( %d n , (int)h[idx].size());       }     }   }   