Acdream Mengzhu

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

 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 }

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