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...#include <stdio.h>
int main()
{
int i,n,s,d,max,min;
while(scanf("%d",&n)!=EOF)
{
for(i=0;i<n;i++)
{
scanf("%d%d",&s,&d);
max=s+d;
min=s-d;
if(max<0||min<0||max%2!=0)
{
printf("impossible\n");
}
else
printf("%d %d\n",max/2,min/2);
}
}
return(0);
}
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