思路

本题考查数位分解。

题解

#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
    int n;
    cin>>n;
    int n1,n2,n3,t;
    n1=n/100;
    n2=n/10%10;
    n3=n%100%10;
    t=n1+n2+n3;
    if(t%3==0){
        cout<<"yes";
    }
    else {
        cout<<"no";
    }
    return 0;
}