题解

#include<iostream>
using namespace std;
int main(){
    int n;
    cin>>n;
    int a=n/1000,b=n/100%10,c=n%100/10,d=n%10;
    if(a*a*a*a+b*b*b*b+c*c*c*c+d*d*d*d==n){
        cout<<"Yes";
    }else{
        cout<<"No";
    }
    return 0;
}