2301.cpp

这些是我到目前在PKU上做出的题目

#include <iostream.h>
int main()
{long n,s,c,i;
 cin>>n;
 for (i=1;i<=n;i++)
 {cin>>s>>c;
  if (s>=c && (s+c)%2==0) cout<<(s+c)/2<<" "<<(s-c)/2<<"\n"; 
   else cout<<"impossible\n";}
return 0;
}