제출 #1247566

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1247566		chikien2009	A Huge Tower (CEOI10_tower)	C++20	100 / 100	75 ms	2632 KiB

tower

#include <bits/stdc++.h>

using namespace std;

void setup()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

int n, a[1000000], d;
long long res = 1;
const long long mod = 1e9 + 9;

int main()
{
    setup();

    cin >> n >> d;
    for (int i = 0; i < n; ++i)
    {
        cin >> a[i];
    }
    sort(a, a + n);
    for (int i = 0, j = 0; i < n; ++i)
    {
        j = max(i, j);
        while (j < n && a[i] + d >= a[j])
        {
            j++;
        }
        (res *= j - i) %= mod;
    }
    cout << res;
    return 0;
}

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