#include <stdio.h>
int main()
{
	int cases,a,b;
	scanf("%d",&cases);
	while(cases--)
	{
		scanf("%d %d",&a,&b);
		if(b>a||(a%2==0&&b%2==1)||(a%2==1&&b%2==0))
		printf("impossible\n");
		else
		printf("%d %d\n",(a+b)/2,(a-b)/2);
	}
	return 1;
}

• Re:对这样的题目我很无语！ (306) mll_world 2012-10-22 21:30:02