Acdream Mengzhu

http://acdream.info/problem?pid=1006

 #include <cstdio>
 #include <cmath>
 #include <cstring>
 #include <algorithm>
 #define ll long long
 #define maxn 10000
 #define mod 10000000007
 using namespace std;
 
 double a,b;
 int t;
 
 int main()
 {
       scanf("%d",&t);
       while(t--)
       {
           scanf("%lf%lf",&a,&b);
           if(a-b>) printf("%.5lf\n",a-);
           else printf("%.5lf\n",log2(pow(,a-)+pow(,b-)));
       }
       return ;
 }