func_code_string: #include <bits/stdc++.h>   int main() {     char old_h[1001][21], new_h[1001][21];     int q, i, j;     char temp[21];     scanf( %d , &q);     for (i = 0; i < q; i++) {       scanf( %s %s , old_h[i], new_h[i]);     }     for (i = 0; i < q; i++) {       for (j = i + 1; j < q; j++) {         if (strcmp(new_h[i], old_h[j]) == 0) {           strcpy(temp, new_h[i]);           strcpy(new_h[i], new_h[j]);           strcpy(new_h[j], temp);         }       }     }     int count = 0;     for (i = 0; i < q; i++) {       if (strcmp(old_h[i], new_h[i]) != 0) count++;     }     printf( %d n , count);     for (i = 0; i < q; i++) {       if (strcmp(old_h[i], new_h[i]) != 0) {         printf( %s %s n , old_h[i], new_h[i]);       }     }   }   