【ECJTU_ACM 11级队员2012年暑假训练赛（8） - K - A short problem】

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B题要套一个数论的模版，注意m=1！！ C题可以二分匹配，把行列看作点; 不能开百度，开谷歌搜题解，再次强调！一经发现，取消成绩！

ECJTU_ACM 11级队员2012年暑假训练赛（8）

4:30:00

K - A short problem

Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u

Submit  Status  Practice  FZU 2013

Description

The description of this problem is very short. Now give you a string(length N), and ask you the max sum of the substring which the length can't small than M.

Input

The first line is one integer T(T≤20) indicates the number of the test cases. Then for every case, the first line is two integer N(1≤N≤1000000) and M(1≤M≤N).

Then one line contains N integer indicate the number. All the number is between -10000 and 10000.

Output

Output one line with an integer.

Sample Input

2
5 1
1 -2 -2 -2 1
5 2
1 -2 -2 -2 1

Sample Output

1
-1

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