hdu1194-Beat the Spread!

http://acm.hdu.edu.cn/showproblem.php?pid=1194

理解题意

 

#include<iostream>
#include<cstring>
#include<cstdio>

using namespace std ;

int main()
{
		int Case ;
		int m , n;
		int a , b ;
		 cin >> Case ;
		while( Case-- )
		{
			cin >> m >> n ;
			if( m < n )
				cout << "impossible" << endl ;
			else if( ( m + n ) % 2 != 0)
				cout << "impossible" << endl ;
			else
			{
				a = ( m + n ) / 2 ;
				b = ( m - n ) / 2 ;
				if( a < b )
					int t = a , a = b , b = t ;
				cout << a << " " << b << endl ; 
			}
		}
		return 0 ;
}