제출 #524055

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
524055		K4YAN	A Huge Tower (CEOI10_tower)	C++17	100 / 100	137 ms	14020 KiB

tower

//Be Name Khoda

#include<bits/stdc++.h>
#pragma GCC optimize("Ofast,unroll-loops")

using namespace std;
#define ll long long
#define ld long double
#define all(x) x.begin(), x.end()
#define pii pair<int, int>
#define pll pair<ll, ll>

const ll mxn = 2e5 + 16, md = 1e9 + 9;
ll t, n, D, q, w;
vector<ll> g;
vector<pll> f;

void input() {

    g.clear(), f.clear();

    cin >> n >> D;
    for(int i = 0; i < n; i++) {
        cin >> q;
        g.push_back(q);
    }

}

void solve() {

    sort(all(g));
    ll ans = 1, ptr = 0;
    for(ll i = 1; i < n; i++) {
        while(g[ptr] < g[i] - D) {
            ptr++;
        }
        ans = ans * (i - ptr + 1) % md;
    }
    cout << ans << endl;
    return;

}

int main() {

    ios::sync_with_stdio(false); cin.tie(NULL);

    input(), solve();

    return 0;

}

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