Simple Statistics

All submissions for this problem are available.
Read problems statements in Mandarin Chinese , Russian and Vietnamese as well.
Sergey has made N measurements. Now, he wants to know the average value of the measurements made.
In order to make the average value a better representative of the measurements, before calculating the average, he wants first to remove the highest K and the lowest K measurements. After that, he will calculate the average value among the remaining N  2K measurements.
Could you help Sergey to find the average value he will get after these manipulations?
Input
The first line of the input contains an integer T denoting the number of test cases. The description of T test cases follows.
The first line of each test case contains two spaceseparated integers N and K denoting the number of measurements and the number of the greatest and the lowest values that will be removed.
The second line contains N spaceseparated integers A_{1}, A_{2}, ..., A_{N} denoting the measurements.
Output
For each test case, output a single line containing the average value after removing K lowest and K greatest measurements.
Your answer will be considered correct, in case it has absolute or relative error, not exceeding 10^{6}.
Constraints
 1 ≤ T ≤ 100
 1 ≤ N ≤ 10^{4}
 0 ≤ 2K < N
 10^{6} ≤ A_{i} ≤ 10^{6}
Subtasks
 Subtask #1 (50 points): K = 0
 Subtask #2 (50 points): no additional constraints
Example
Input: 3 5 1 2 9 10 25 1 5 0 2 9 10 25 1 3 1 1 1 1 Output: 4.000000 5.400000 1.000000
Explanation
Example case 1. After removing 1 greatest and 1 lowest measurement, we get the set {2, 9, 1}. The average value in this set is (2+9+1)/3=4.
Example case 2. The average value in the set {2, 9, 10, 25, 1} is (2+910+25+1)/5=5.4.
Example case 3. After removing the 1 largest and smallest measurements, Sergey will be left with only one measurement, i.e. 1. Average of this is 1 itself.
Author:  xcwgf666 
Tester:  zedthirtyeight 
Editorial  http://discuss.codechef.com/problems/SIMPSTAT 
Tags  cakewalk, ltime34, sorting, xcwgf666 
Date Added:  21022016 
Time Limit:  1 sec 
Source Limit:  50000 Bytes 
Languages:  C, CPP14, JAVA, PYTH, PYTH 3.5, PYPY, CS2, PAS fpc, PAS gpc, RUBY, PHP, GO, NODEJS, HASK, SCALA, D, PERL, FORT, WSPC, ADA, CAML, ICK, BF, ASM, CLPS, PRLG, ICON, SCM qobi, PIKE, ST, NICE, LUA, BASH, NEM, LISP sbcl, LISP clisp, SCM guile, JS, ERL, TCL, PERL6, TEXT, SCM chicken, CLOJ, FS 
Comments
 Please login at the top to post a comment.
SUCCESSFUL SUBMISSIONS
Fetching successful submissions
HELP
If you are still having problems, see a sample solution here. 