#include <stdio.h>
int main()
 {
 int a[100],b[100],n,i,j;
 scanf("%d",&n);
 for(i=0;i<n;i++)
 {
  scanf("%d %d",&a[i],&b[i]);
 }
 for(j=0;j<n;j++)
 {
  if(b[i]>=0&&a[j]>=b[j]&&(a[j]+b[j])>=0&&(a[i]+b[i])%2==0)
   {
         printf("%d %d\n",(a[j]+b[j])/2,(a[j]-b[j])/2);
   }
  else printf("impossible\n");
 }
 return 0;
}

• Re:怎么不对~ (697) feima 2008-11-01 20:27:09