Online JudgeProblem SetAuthorsOnline ContestsUser
Web Board
Home Page
F.A.Qs
Statistical Charts
Problems
Submit Problem
Online Status
Prob.ID:
Register
Update your info
Authors ranklist
Current Contest
Past Contests
Scheduled Contests
Award Contest
User ID:
Password:
  Register
Language:
Sherlock Holmes
Time Limit: 1000MSMemory Limit: 65536K
Total Submissions: 838Accepted: 249

Description

Sherlock Holmes, the well known detective, must solve a puzzling situation. He has n boxes B1, B2, .., Bn , where n is even, each containing m balls. The balls are white and black. Let Bi = (Wi, Bi) denote a box with Wi white balls and Bi black balls. He must partition the boxes into two sets, each consisting of n/2 boxes, such that either the white balls or the black balls hold amajority in both sets. If there is such a majority, let m1 and m2 denote the percentage of the majority balls in each set. Holmes must find very quickly the maximum possible value of min(m1, m2). Can you help Holmes?

Input

There are several testcases. Each data set in the file stands for a particular set of boxes. A data set starts with the number n (n < 10000) of boxes. Follows the number m (m < 10000) of balls, and for each box the number (< 10000) of white and black balls in this specific order. White spaces can occur freely in the input. The input data are correct and terminate with an end of file.

Output

For each set of data the program prints the result to the standard output from the beginning of a line. The program prints the color (W or B) of the balls that hold the majority followed by the maximum value - if there is such a majority, or "No solution" (without quotes) if no majority can be obtained. An input/output sample is in the table below. There is a single data set that contains 4 boxes each containing 30 balls. The first box, for example, contains 17 white balls and 13 black balls. There is only one possible partition of the boxes (B1, B4), (B2, B3), the white balls holding majority. The result for the data set is the identifier W and the maximum value.

Sample Input

4
30
17 13
12 18
20 10
14 16

Sample Output

W 51.67

Source

[Submit]   [Go Back]   [Status]   [Discuss]

Home Page   Go Back  To top


All Rights Reserved 2003-2013 Ying Fuchen,Xu Pengcheng,Xie Di
Any problem, Please Contact Administrator