题解 | 变幻莫测

#include <iostream>
using namespace std;

int main() {
    int x,y;
    cin>>x>>y;
    if(x==y){
        cout<<0<<endl;
    }else if(y==0){
        cout<<1<<endl;
    }else if(x==0){
        cout<<2<<endl;
    }else if(x+y==0){
        cout<<3<<endl;
    }else{
        cout<<-1<<endl;
    }
    return 0;
}
// 64 位输出请用 printf("%lld")