Hi all!

I used Binary Search to solve this problem (because I'm not good at Math) and got AC after WA#2 3 times.

For getting AC, I changed my print line from:

cout << result << endl;
// or print("%f\n", result);

To:

print("%.2f\n", result);

It means you must format your result with 2 precisions after the decimal point, or your result will be something like: 14.99038461538461538461538461538462 (many number after the decimal point).

I hope this would help.
Please reply and notice me if there is something wrong.

MitRo.