1056：点和正方形的关系-信息学奥赛一本通

#include<algorithm>

#include<cmath>

#include<cstdio>

#include<iostream>

using namespace std;

int main(){

int x,y;

cin>>x>>y;

if(-1<=x && x<=1 && -1<=y && y<=1){

cout<<"yes";

}

else{

cout<<"no";

}

return 0;

}