随机算法

 1 void ShuffleArray_Fisher_Yates(char* arr, int len)

 2 {

 3     int i = len, j;

 4     char temp;

 5  

 6     if ( i == 0 ) return;

 7     while ( --i ) {

 8         j = rand() % (i+1);

 9         temp = arr[i];

         arr[i] = arr[j];

         arr[j] = temp;

     }

 }

摘自：http://coolshell.cn/articles/8593.html