UVa 10812 Beat the Spread! (陷阱)

10812 - Beat the Spread!

/*0.018s*/

#include<cstdio>

int main()
{
	int t, s, d;
	scanf("%d", &t);
	while (t--)
	{
		scanf("%d%d", &s, &d);
		if (s < d || (s + d) & 1) puts("impossible");
		else printf("%d %d\n", (s + d) >> 1, (s - d) >> 1);
	}
	return 0;
}