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help#include <stdio.h>
#include <math.h>
void main(){
int n,a,b,x,y,i;
scanf("%d",&n);
for(i=0;i<n;i++){
scanf("%d %d",&a,&b);
if(a>b && (a+b)%2==0){
printf("%d %d\n",(a+b)/2,(a-b)/2);
}
else
printf("impossible\n");
}
}
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