제출 #405686

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
405686		four_specks	A Huge Tower (CEOI10_tower)	C++17	100 / 100	204 ms	8732 KiB

tower

#include <bits/stdc++.h>

using namespace std;

const int mod = 1'000'000'009;

void solve()
{
    int n;
    long d;
    cin >> n >> d;

    vector<int> a(n);
    for (int i = 0; i < n; i++)
        cin >> a[i];
    sort(a.begin(), a.end());

    long c = 1;
    for (int i = 0; i < n; i++)
    {
        int x = i + 1 - (lower_bound(a.begin(), a.end(), a[i] - d) - a.begin());
        c *= x;
        c %= mod;
    }

    cout << c << '\n';
}

int main()
{
    ios_base::sync_with_stdio(false), cin.tie(nullptr);

    solve();

    return 0;
}

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