更新桶排序 
 #include<stdio.h>
int main()
{     char arr[100] = { 0 };     char *p = arr;     int count[100] = { 0 };     gets(arr);     while (*p)         count[*p]++, p++;     if (count[65] == count[66])         printf("E\n");     else
        printf("%c\n",count[65] >  count[66] ? 'A' : 'B' );     return 0;
}