func_code_string: #include <bits/stdc++.h>   using namespace std;   bool possible = 1;   void change(char str[], char mask[]) {     char best[6];     best[0] =   0 ;     for (int i = 0; i < (4); ++i) {       for (int d = 0; d < (10); ++d)         if (!(i == 0 && d == 0)) {           char temp = str[i];           str[i] = (d +  0 );           if (strcmp(str, mask) >= 0) {             if (best[0] ==   0 )               strcpy(best, str);             else if (strcmp(best, str) > 0)               strcpy(best, str);           }           str[i] = temp;         }     }     if (strcmp(best,  2011 ) > 0) possible = 0;     strcpy(str, best);   }   int main() {     int n;     scanf( %d , &n);     char in[1005][6];     for (int i = 0; i < (n); ++i) scanf( %s , in[i]);     change(in[0],  1000 );     possible = 1;     for (int i = (1); i <= (n - 1); ++i) {       change(in[i], in[i - 1]);     }     if (!possible)       puts( No solution );     else {       for (int i = 0; i < (n); ++i) printf( %s n , in[i]);     }     return 0;   }   