Acdream Mengzhu

 1 #include <cstdio>
 2 #include <cmath>
 3 #include <cstring>
 4 #include <algorithm>
 5 #define ll long long
 6 #define maxn 10000
 7 #define mod 10000000007
 8 using namespace std;
 9 
10 double a,b;
11 int t;
12 
13 int main()
14 {
15       scanf("%d",&t);
16       while(t--)
17       {
18           scanf("%lf%lf",&a,&b);
19           if(a-b>20) printf("%.5lf\n",a-1);
20           else printf("%.5lf\n",log2(pow(2,a-1)+pow(2,b-1)));
21       }
22       return 0;
23 }