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a guest Aug 12th, 2017 45 Never
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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. int main() {
  6.     char * s = calloc(1,sizeof(char));
  7.     int i,j;
  8.     for (i=1; i<=3; i++) {
  9.         for(j=1; j<=i; j++) {
  10.             //s = realloc(s, (strlen(s)+1) * sizeof (char));
  11.             int t;
  12.             for (t = strlen(s); t >= 0; t--) {
  13.                 s[t+1] = s[t];
  14.             }
  15.             s[0] = j+'0';
  16.         }
  17.     }
  18.     printf("%s\n", s);
  19.     return 0;
  20. }
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