func_code_string: #include <bits/stdc++.h>   using namespace std;   char s[1010][3][50];   bool p[1010];   int main() {     int n, i, j, c;     cin >> n;     for (i = 1; i <= n; i++) cin >> s[i][1] >> s[i][2];     memset(p, true, sizeof(p));     for (i = 1; i <= n; i++) {       for (j = 1; j <= n; j++) {         if (i != j) {           if (strcmp(s[i][2], s[j][1]) == 0) {             strcpy(s[i][2], s[j][2]);             p[j] = false;           }         }       }     }     for (i = 1, c = 0; i <= n; i++)       if (p[i]) c++;     cout << c << endl;     for (i = 1; i <= n; i++) {       if (p[i]) cout << s[i][1] <<     << s[i][2] << endl;     }     return 0;   }   