#include<bits/stdc++.h>
using namespace std;
int main()
{
    int a,y;
    cin>>a>>y;
    if (a<=1 and a>=-1 and y<=1 and y>=-1){
    	cout<<"yes";
	}
	else
	{
		cout<<"no";
	}
    return 0;
}

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int a;
    cin>>a;
    if(a%4==0 && a%100!=0 || a%400==0)
    {
        cout<<"no";
    }
    else
    {
        cout<<"yes";
    }
    return 0;
}

#include<bits/stdc++.h> using namespace std; int main() { int a,y; cin>>a>>y; if (a<=1 and a>=-1 and y<=1 and y>=-1) { cout<<"yes"; } else { cout<<"no"; } return 0; }

#include<bits/stdc++.h> using namespace std; int main() { int x,y; cin>>x>>y; if(x>=-1&&x<=1&&y>=-1&&y<=1) { cout<<"yes"; } else { cout<<"no"; } return 0; }

..............努力获得题解👀️ 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.............................................................................................................. 题解来了：

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int a;
    cin>>a;
    if(a%4==0 && a%100!=0 || a%400==0)
    {
        cout<<"N";
    }
    else
    {
        cout<<"Y";
    }
    return 0;
}