套公式

兔=(总头数*4-总足数)/2
鸡=总头数-兔

#include<iostream>
using namespace std;
int main(){
    int x,y;
    cin>>x>>y;
    int c,r;
    cout<<(4*x-y)/2<<"\n"<<x-(4*x-y)/2;
    return 0;
}