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#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define endl "\n"
 
const double PI = 3.14159265358979;
const ll INF =  1e18 + 7;
const ll MOD = 1e9 + 7;
const ll nax = 1000005;
const int LOG = 25;


void solve() {
    int n, k;
    cin >> n >> k;
    int a[n];
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    int zeroCnt = 0, tail = 0, head = -1, ans = 0;
    while(tail < n) {
        while(head + 1 < n && ((a[head + 1] == 0) + zeroCnt) <= k) {
            head++;
            zeroCnt += (a[head] == 0);
        }
        ans = max(ans, head - tail + 1);
        if (head >= tail) {
            zeroCnt -= (a[tail] == 0);
            tail++;
        } else {
            tail++;
            head = tail - 1;
        }
    }
    cout << ans << endl;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int t; cin >> t; while(t--)
    solve();
    return 0;
}