#include <bits/stdc++.h>
using namespace std;
int main()
{
int t;
cin >> t;
while(t--){
int n,k;
cin >> n ;
cin>>k;
std::vector<int>vct(n);
std::vector<int>vct1;
for(int i=0;i<n;i++)
{
cin>>vct[i];
}
for(int i=0;i<n-k+1;i++)
{
int sum=0;
for(int j=i;j<i+k;j++)
{
sum+=vct[j];
}
vct1.push_back(sum);
}
sort(vct1.begin(),vct1.end());
cout<<vct1[vct1.size()-1];
}
return 0;
}
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