
ZOJ Problem Set  2549
The player starts with a prize of $1, and is asked a sequence of n questions. For each question, he may
Once each question is asked, the player is able to assess the probability p that he will be able to answer it. For each question, we assume that p is a random variable uniformly distributed over the range t .. 1. InputInput is a number of lines, each with two numbers: an integer 1 ≤ n ≤ 30, and a real 0 ≤ t ≤ 1. Input is terminated by a line containing 0 0. This line should not be processed. OutputFor each input n and t, print the player's expected prize, if he plays the best strategy. Output should be rounded to three fractional digits. Sample Input1 0.5 1 0.3 2 0.6 24 0.25 0 0 Sample Output1.500 1.357 2.560 230.138 Source: University of Waterloo Local Contest 2005.09.17 