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  1. #include <stdio.h>
  2. #define MAX_CHARS 256
  3.  
  4. char * remove_duplicates(char *s){
  5.  
  6.         int hash[MAX_CHARS],i;
  7.         char *source, *destination;
  8.         if(s == NULL) return NULL;
  9.  
  10.         source = s;
  11.         destination = s;
  12. /* Initialize hash */
  13.         for(i=0;i<MAX_CHARS; i++) hash[i]=0;
  14.  
  15.         while(*source != '\0'){
  16.      /* If this is first time character is encountered */
  17.                 if(hash[*source] == 0){
  18.                         hash[*source]++;
  19.                         *destination = *source;
  20.                         destination++;
  21.                         source++;
  22.                 }
  23.        /* We have already processed this character. */
  24.                 else{
  25.                         source++;
  26.                 }
  27.         }
  28.       /*Imp : Terminate the string */
  29.         *destination = '\0';
  30.         return s;
  31. }
  32. int main(void) {
  33. 	// your code goes here
  34. 	char str[10] = "aaabccc";
  35. 	printf("%s\n", remove_duplicates(str));
  36.  
  37. 	char str1[] ="abcdef";
  38. 	printf("%s\n", remove_duplicates(str1));
  39.  
  40. 	char str2[] = "";
  41. 	printf("%s\n", remove_duplicates(str2));
  42.  
  43. 	if(remove_duplicates(NULL) != NULL){
  44. 	printf("%s\n", remove_duplicates(NULL));
  45. 	}
  46. 	return 0;
  47. }
  48.  
Success #stdin #stdout 0s 2248KB
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stdin
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Standard input is empty
stdout
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abc
abcdef
https://ideone.com/5qpDg9
Remove duplicate
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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