#include <bits/stdc++.h>
using namespace std;
int main() {
int t;
cin >> t;
while(t--)
{
int n,k;
cin >> n >> k;
vector<int> v;
for(int i=0;i<n;i++)
{
int a;
cin >> a;
v.push_back(a);
}
int c=0,sum=0;
for(int i=0;i<n;i++)
{
sum = sum + v[i];
if(i==((k-1)%2==0))
{
if(sum>0)
{
c--;
}
else
{
c++;
}
i++;
}
}
cout << c << endl;
}
return 0;
}
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