ACM 10812 - Beat the Spread!

#include <stdio.h>

int main()
{
    int i, add, sub, x, y, n;
    if (scanf("%d", &n) < 1) return 0;
    for (i = 0 ; i < n ; i ++)
    {
        scanf("%d %d", &add, &sub); 
        if (add < sub || (add + sub) % 2 == 1 && (add - sub) % 2 == 1)
        {
            printf("impossible\n"); 
            continue;
        }
        x = (add + sub) / 2;
        y = (add - sub) / 2;
        printf("%d %d\n", x, y);
    }   
    return 0;
}

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