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哈哈哈哈哈哈哈#include <stdio.h>
int main() {
int n,a,b;
scanf("%d",&n);
while(n--){
scanf("%d%d",&a,&b);
if((a-b)%2||a<b)printf("impossible\n");
else printf("%d %d\n",(a+b)/2,(a-b)/2);
}
return 0;
}
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