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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3.  
  4. #define NO_OF_CHARS 256
  5.  
  6. char *removeDups(char *str)
  7. {
  8.      int i, j=0;
  9.      int *count=(int *)calloc(NO_OF_CHARS, sizeof(int));    
  10.  
  11.      for(i=0; *(str+i); i++)                                
  12.      {
  13.               count[*(str+i)]++;                            
  14.      }
  15.      for(i=0; *(str+i); i++)
  16.      {
  17.               if(count[*(str+i)]!=-1)
  18.               {
  19.                                      count[*(str+i)]=-1;
  20.                                      *(str+j)=*(str+i);
  21.                                      j++;
  22.               }
  23.      }
  24.      *(str+j) = '\0';
  25.      return str;
  26. }
  27.  
  28. int main()
  29. {
  30.   char str[] = "geeksforgeeks";
  31.   printf("%s", removeDups(str));
  32.   getchar();
  33.   return 0;
  34. }
  35.  
Success #stdin #stdout 0s 2384KB
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geksfor
https://ideone.com/6GViO6
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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