题解，直接复制

#include <iostream>
using namespace std;
int main(){
int n;
cin>>n;
int a;
int sum;
for (int i=1;i<=n;i++){
int sum=0;
cin>>a;
while (a>0){
sum=sum+a%10;
a=a/10;
}
if (sum%7==0){
cout<<"Yes";
cout<<endl;
}
else{
cout<<"No";
cout<<endl;
}
}
return 0;
}