UVa 10812 Beat the Spread!

#include <cstdio>#include <iostream>#include <vector>#include <map>#include <algorithm>using namespace std;int main(){int n;int s, d;scanf("%d", &n);while (n-- > 0){scanf("%d%d", &s, &d);if (s < d || (s + d) & 1){printf("impossible\n");}else{printf("%d %d\n", (s + d) >> 1, (s - d) >> 1);}}return 0;}