题解

#include<bits/stdc++.h>
using namespace std;
int main(){
int x,y;cin>>x>>y;if(x1&&y1){cout<<"yes";}else if(x1&&y-1){cout<<"yes";}else if(x==-1&&y==-1){cout<<"yes";}else if(x0&&y0){cout<<"yes";}else if(x==-1&&y==1){cout<<"yes";}else{cout<<"no";}return 0;
}