zoj_2388 Beat the Spread!

题目链接：http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=1364

 

//C++代码
#include<iostream>
using namespace std;

int main(){
	int n,a,b;
	cin>>n;
	while(n--){
		cin>>a>>b;
		if(a<b || (a+b)&1) cout<<"impossible"<<endl;
		else cout<<(a+b)/2<<" "<<(a-b)/2<<endl;
	}
	return 0;
}