假设都是兔：

#include <bits/stdc++.h>
using namespace std;
int main(){
	int x,y;
	cin>>x>>y;    // x代表头，  y代表脚
	int check=0,ribbit=0;
	check= (x*4-y)/2;
	ribbit = x-check;
    cout<<check<<" "<<ribbit;

	return 0;
}

假设都是鸡：

#include <bits/stdc++.h>
using namespace std;
int main(){
	int x,y,check,ribbit;
	cin>>x>>y;
	ribbit = (y-2*x)/2;
	check=x-ribbit;
	cout<<check<<" "<<ribbit;
	return 0;
}