제출 #1155084

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1155084		raphaeltroen	A Huge Tower (CEOI10_tower)	C++20	30 / 100	178 ms	5264 KiB

tower

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

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;
    int j = 0;
    for (int i = 0; i < n; i++) {
        while(a[j]+d<a[i] && j<i){j++;}
        ans *= ll(1 + i-j)%ll(1e9+9);
    }
    cout << ans;
    return 0;
}

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