hdu-1194 Beat the Spread!

#include<stdio.h>int main(){   int s,n,d,x,y;   scanf("%d",&n);   while(n--)   {   int flag=0;      scanf("%d%d",&s,&d);   if(s<d)    flag=1;   if((s+d)%2!=0)    flag=1;   x=(s+d)/2;   y=s-x;   if(flag==1)    printf("impossible\n");   else    printf("%d %d\n",x>y?x:y,x>y?y:x);   }   return 0;}       注意特殊数据100   1，这道题还是比较简单的