c782

/* c782              */
/* AC (0.3s, 17.2MB) */
#pragma warning( disable : 4996 )
#include <cstdio>
#include <cstring>
#include <cstdint>
#include <cmath>
#include <algorithm>
#include <tuple>
#define ios_jazz ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

using namespace std;

constexpr int Dir4[4][2] = { {0, 1}, {1, 0}, {0, -1}, {-1, 0} };
constexpr int Dir8[8][2] = { {-1, -1}, {-1, 1}, {0, -1}, {0, 1}, {1, -1}, {1, 1} };
constexpr double EPS = 1e-9;
const double PI = acos(-1);

using int16 = short;
using uint16 = unsigned short;
using uint = unsigned int;
using int64 = long long;
using uint64 = unsigned long long;
using pii = pair<int, int>;

/* fast power */
auto pow_fast_2 = [](int64 b) -> int64 { return 1 << b; };

template <typename T>
T pow_fast(T x, int64 b) noexcept
{
    T tmp = 1;
    while (b)
    {
        if (b & 0x1) tmp = x * tmp;
        x = x * x;
        b >>= 1;
    }
    return tmp;
}

/* main code */
constexpr int MAXN = 2000000;
int t, n, k, arr[MAXN + 1], l, r;
int64 ans, wi[MAXN + 1]{};
int main()
{
    scanf("%d", &t);
    while (t-- && scanf("%d %d", &n, &k))
    {
        ans = 0, l = n - 1, r = n;
        for (int i = 1; i <= n; ++i) scanf("%d", arr + i);
        for (int i = 1; i <= n; wi[i] += wi[i - 1], ++i) scanf("%lld", wi + i);

        while (l && (arr[r] - arr[l]) <= k)
            --l;
        while(l)
        {
            ans += (wi[r] - wi[r - 1]) * wi[l];
            --r;
            while (l && (arr[r] - arr[l]) <= k)
                --l;
        }
        printf("%lld\n", ans);
    }

    return 0;
}