func_code_string: #include <bits/stdc++.h>   using namespace std;   int q, ans;   char s[300010];   set<int> len, hs[300010];   int p[300010], v[300010];   int main() {     int i, l, op;     for (i = 1, p[0] = 1; i <= 300000; ++i)       p[i] = 1LL * p[i - 1] * 27 % 1000000007;     scanf( %d , &q);     while (q--) {       scanf( %d%s , &op, s + 1);       l = strlen(s + 1);       for (i = 1, v[0] = 0; i <= l; ++i)         v[i] = (1LL * v[i - 1] * 27 + s[i] -  a  + 1) % 1000000007;       if (op == 1) {         len.insert(l);         hs[l].insert(v[l]);       } else if (op == 2)         hs[l].erase(v[l]);       else {         ans = 0;         for (auto it = len.begin(); it != len.end(); it++)           for (i = *it; i <= l; i++)             ans += (hs[*it].find((v[i] - 1LL * v[i - *it] * p[*it] % 1000000007 +                                   1000000007) %                                  1000000007) != hs[*it].end());         printf( %d n , ans);         fflush(stdout);       }     }     return 0;   }   