func_code_string: #include <bits/stdc++.h>   using namespace std;   string s;   char zh[125], ch, sw;   int n, m;   int main() {     cin >> n >> m >> s;     for (int i = 97; i <= 122; i += 1) {       zh[i] = i;     }     for (int i = 1; i <= m; i += 1) {       cin >> ch >> sw;       for (int j = 97; j <= 122; j += 1) {         if (zh[j] == ch) {           zh[j] = sw;         } else {           if (zh[j] == sw) {             zh[j] = ch;           }         }       }     }     for (int i = 0; i <= n - 1; i += 1) {       cout << zh[s[i]];     }     return 0;   }   