除掉字符串里面相同的字符

题目:

除掉字符串里面相同的字符

such as 字符串“aaaabbbccdd” 出去相同的字符就会变成“abcd”

代码：

  

   

    

     

    
    

     

      #include <stdio.h>
     
    
   

    

     

    
    

     

      #include <stdlib.h>
     
    
   

    

     

    
    

     

      #include <string.h>
     
    
   

    

     

    
    

     
 
     
    
   

    

     

    
    

     

      void grepString1(char a[]) {
     
    
   

    

     

    
    

     

      	int length = strlen(a);
     
    
   

    

     

    
    

     

      	int i = 0, j = 0;
     
    
   

    

     

    
    

     

      	for (i=0; i < length; ++i) {
     
    
   

    

     

    
    

     

       if (a[i] != 0) {
     
    
   

    

     

    
    

     

       a[j++] = a[i];
     
    
   

    

     

    
    

     

       for (int k = i+1; k < length; k++) {
     
    
   

    

     

    
    

     

       if (a[i] == a[k]) {
     
    
   

    

     

    
    

     

       a[k] = 0;
     
    
   

    

     

    
    

     

       }
     
    
   

    

     

    
    

     

       }
     
    
   

    

     

    
    

     

       }
     
    
   

    

     

    
    

     

       }
     
    
   

    

     

    
    

     

      }
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

      void grepString2(char a[]) {
     
    
   

    

     

    
    

     

       bool h[256];
     
    
   

    

     

    
    

     

       memset(h, 0, sizeof(h));
     
    
   

    

     

    
    

     

       int i = 0, j = 0; 
     
    
   

    

     

    
    

     

       while (a[i]) {
     
    
   

    

     

    
    

     

       if (!h[a[i] - 'a']) {
     
    
   

    

     

    
    

     

       a[j++] = a[i];
     
    
   

    

     

    
    

     

       h[a[i] - 'a'] = true;
     
    
   

    

     

    
    

     

       }
     
    
   

    

     

    
    

     

       ++i;
     
    
   

    

     

    
    

     

       }
     
    
   

    

     

    
    

     

       a[j] = 0;
     
    
   

    

     

    
    

     

      } 
     
    
   

    

     

    
    

     

      
     
    
   

    

     

    
    

     

      int main() {
     
    
   

    

     

    
    

     

       char a[10] = "aaabbccdd";
     
    
   

    

     

    
    

     

       grepString1(a);
     
    
   

    

     

    
    

     

       printf("字符串里面不同的字符为%s\n", a);
     
    
   

    

     

    
    

     

       char str[100] = "aaabbccdddddfffffdaaceeedj";
     
    
   

    

     

    
    

     

       grepString2(str
     
    
  
 

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原文链接：chenyu.blog.csdn.net/article/details/52799649