Hunter Island

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In a mystical HunterLand, a person's health and wealth is measured in terms of time(seconds) left. Suppose a person there has 24x60x60 = 86400 seconds left, then he would live for another 1 day. A person dies when his time left becomes 0. Some timeamount can be borrowed from other person, or timebanks. Some timeamount can also be lend to another person, or can be used to buy stuffs.
Our hero Mr X, is in critical condition, has very less time left.
Today's the inaugural day of a new timebank. So they are giving away free timeamount worth 1000 years.
Bank released N slips, A[1], A[2], .... A[N]. Each slip has a timeamount(can be +ve as well as ve).
A person can pick any number of slips(even none, or all of them, or some of them) out of the N slips. But bank introduced a restriction, they announced one more number K. Restriction is that, if a person picks a slip A[i], then the next slip that he can choose to pick will be A[i+K+1]. It means there should be a difference of atleast K between the indices of slips picked.
Now slip(s) should be picked in such a way that their sum results in maximum positive timeamount sum possible with the given restriction.
If you predict the maximum positive sum possible, then you win.
Mr X has asked for your help. Help him win the lottery, and make it quick!
Input
First line of the test file contains single number T, the number of test cases to follow.
Each test case consists of two lines.
First line contains two numbers N and K , separated by a space. Second line contains the N numbers A[1], A[2] ..... A[N] separated by space.
Output
For every test case, output in a single line the maximum positive sum possible, that is output for the case.
Constraints
T ≤ 250
N ≤ 10000
109 ≤ A[i] ≤ 109
0 ≤ K ≤ N1
Example
Input:
2
10 1
1 2 3 5 4 6 3 2 1 2
10 2
1 2 3 5 4 6 3 2 1 2
Output:
12
10
Explanation
1st Case: We can take slips { A[2]=2, A[6]=6, A[8]=2, A[10]=2 }, slips are atleast 1 indices apart this makes maximum sum, A[2]+A[6]+A[8]+A[10]=12
2nd Case: We can take slips { A[2]=2, A[6]=6, A[10]=2 }, slips are atleast 2 indices apart this makes maximum sum, A[2]+A[6]+A[10]=10
Author:  big_oh1312 
Tags  big_oh1312 
Date Added:  1012016 
Time Limit:  0.5 sec 
Source Limit:  50000 Bytes 
Languages:  C, CPP14, JAVA, PYTH, PYTH 3.6, 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 
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