func_code_string: #include <bits/stdc++.h>   using namespace std;   int n, tot, Trie[2000000 + 5][2], Num[2000000 + 5];   long long x;   char s[9], ch[20];   int main() {     for (scanf( %d , &n); n; n--) {       scanf( %s , s);       if (s[0] ==  ? ) {         scanf( %s , ch);         int len = strlen(ch), u = 0, ans;         for (int i = 1; i <= 19; i++) {           int j = 0;           if (i <= len) {             j = ch[len - i] -  0 ;             ch[len - i] =   0 ;           }           if (!Trie[u][j]) {             u = -1;             break;           }           u = Trie[u][j];         }         if (!~u)           ans = 0;         else           ans = Num[u];         printf( %d n , ans);       } else {         scanf( %I64d , &x);         for (int i = 0, u = 0; i <= 18 || x; i++, x /= 10) {           int j = (x % 10) & 1;           if (!Trie[u][j]) Trie[u][j] = ++tot;           u = Trie[u][j];           Num[u] += (s[0] ==  +  ? 1 : -1);         }       }     }     return 0;   }   