仅供参考，举报我全家四

#include <bits/stdc++.h>
using namespace std;
int n , x , y;
int main()
{
	cin>>n;
	for(int i = 1 ; i<=n ; i++)
	{
		cin>>x;
		while(x)
		{
			y+=x%10;
			x/=10;
		}
		if(y%7==0) cout<<"Yes"<<endl;
		else cout<<"No"<<endl;
		y = 0;
	}
	return 0;
}