func_code_string: #include <bits/stdc++.h>   using std::cin;   using std::cout;   using std::endl;   using std::string;   using std::vector;   int zfn[100010];   int count = 0, nodes_count;   string P, T;   vector<string> str;   vector<vector<int> > connections;   void kmpPreprocess() {     int i = 0, j = -1;     zfn[0] = -1;     while (i < P.size()) {       while (j >= 0 && P[i] != P[j]) j = zfn[j];       i++;       j++;       zfn[i] = j;     }   }   void kmp_DFS(int current, int j) {     string T = str[current];     int i = 0;     while (i < T.size()) {       while (j >= 0 && T[i] != P[j]) j = zfn[j];       i++;       j++;       if (j == P.size()) {         count++;         j = zfn[j];       }     }     for (vector<int>::iterator it = connections.at(current).begin();          it != connections.at(current).end(); ++it) {       kmp_DFS(*it, j);     }   }   int main() {     cin.sync_with_stdio(false);     cin >> nodes_count;     str.resize(nodes_count + 1);     for (int i = 0; i < nodes_count; i++) {       vector<int> v;       connections.push_back(v);     }     int current_parent;     for (int current_node = 0; current_node < nodes_count - 1; current_node++) {       T =   ;       cin >> current_parent >> T;       connections[current_parent - 1].push_back(current_node + 1);       str.at(current_node + 1) = T;     }     cin >> P;     kmpPreprocess();     T =   ;     kmp_DFS(0, 0);     cout << count << endl;     return 0;   }   