HDU 1056 - HangOver

递推

 #include <iostream>
 using namespace std;
 double f[];
 double c;
 int main()
 {
     f[]=;
     for(int i=;i<=;i++) f[i]=1.0/(i+)+f[i-];
     while(cin>>c,c!=)
     {
         int m=;
          while(f[m]<c) m++;
          cout<<m<<" card(s)\n";
     }
 }