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  1. #include <stdlib.h>
  2. #include<iostream>
  3. using namespace std;
  4. #define NO_OF_CHARS 256 
  5.  
  6. bool* getCharCountArray(char *str) 
  7. { 
  8.    bool *count = (bool *)calloc(sizeof(bool), NO_OF_CHARS); 
  9.    for (int i = 0; str[i];  i++) 
  10.       count[ str[i] ] = 1; 
  11.    return count; 
  12. } 
  13.  
  14. char *removeDirtyChars(char *str, char *mask_str) 
  15. { 
  16.   bool* count  = getCharCountArray(mask_str); 
  17.  
  18.   int ip_ind = 0, res_ind = 0; 
  19.   while ( str[ip_ind] ) 
  20.   { 
  21.     char temp = str [ip_ind]; 
  22.     if (count[temp] ==  0) 
  23.             str [res_ind++] = str [ip_ind]; 
  24.       ip_ind++; 
  25.   }     
  26.  
  27.  str[res_ind] = '\0';     
  28.  return str; 
  29. } 
  30.  
  31. int main() 
  32. { 
  33.     char str[]         = "geeksforgeeks"; 
  34.     char mask_str[]  = "mask"; 
  35.     cout<< removeDirtyChars(str, mask_str) <<endl; 
  36.     return 0; 
  37. }
Success #stdin #stdout 0s 4484KB
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geeforgee
https://ideone.com/FwSBWU
language:
C++ (gcc 8.3)
created:
3 years ago
visibility:
public

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