真·题解

#include<iostream>
using namespace std;
int main(){
long long a,b,c;
cin>>a>>b;
if (b%2!=0 || b<a2){
cout<<"No";
return 0;
}
c = ((b-a4)/2 * -1)2 + (a-(b-a4)/2 * -1)*4;
if (c == b){
cout<<"Yes";
}else{
cout<<"No";
}
return 0;
}