제출 #668735

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
668735		Dec0Dedd	A Huge Tower (CEOI10_tower)	C++14	100 / 100	311 ms	10520 KiB

tower

#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int N = 1e5+10;
const ll MOD = 1e9+9;

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

    ll ans=1, r=0;
    for (ll i=0; i<n; ++i) {
        r=max(i, r);
        while (r < n && a[i]+d >= a[r]) ++r;
        (ans*=r-i)%=MOD;
    } cout<<ans<<"\n";
}

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