ACM10812.c

ACM10812.c

#include <stdio.h>
#include <stdlib.h>

/*
http://uva.onlinejudge.org/index.php?option=onlinejudge&Itemid=99999999&page=show_problem&category=&problem=1753&mosmsg=Submission+received+with+ID+14388286
*/


int main()
{
    int total_cases, count = 0, input_1, input_2;
    scanf("%d", &total_cases);
    while(scanf("%d %d", &input_1, &input_2)!= EOF){
        count++;
        if(count > total_cases){
            break;
        }

        if(input_1 < input_2 || (input_1 + input_2) % 2 != 0 || (input_1 - input_2) % 2 != 0){
            printf("impossible\n");
            continue;
        }
        printf("%d %d\n", (input_1 + input_2) / 2, (input_1 - input_2) / 2);
    }
    return 0;
}