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Delete Characters.

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Given string a and b. Delete all characters of a that are in b.

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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<string.h>
  4.  
  5. char* deleteCharacters(char * str, char * charSet)
  6. {
  7. 	int hash [256];
  8. 	if(NULL == charSet)
  9. 		return str;
  10. 	for(int i = 0; i < 256; i++)
  11. 		hash[i] = 0;
  12. 	for(int i = 0; i < strlen(charSet); i++)
  13. 		hash[charSet[i]] = 1;
  14. 	int currentIndex = 0;
  15. 	for(int i = 0; i < strlen(str); i++)
  16. 	{
  17. 		if(!hash[str[i]])
  18. 			str[currentIndex++] = str[i];
  19. 	}
  20. 	str[currentIndex] = '\0';
  21. 	return str;
  22. }
  23.  
  24. int main()
  25. {
  26.     char s[2] = "a";
  27.     char s2[5] = "aca";
  28. 	printf("%s", deleteCharacters(s2, s));
  29. 	return 0;
  30. }

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