蓝桥0815-3个字符比较输出

#include <cstdio> 
#include <cstring>
#include <iostream> 
#include <stdio.h>
using namespace std;

int main()
{
    //字符判断 
    
    char a[5];
    cin.getline(a,4);
    if(a[0] == a[1] && a[1] != a[2] ||
       a[0] == a[2] && a[1] != a[2] ||
       a[1] == a[2] && a[0] != a[2]
    )
    {
        printf("%s","Yes");
    }
    else
    {
        printf("%s","No");
    }

    return 0;    
}