제출 #1082849

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1082849		rcll	A Huge Tower (CEOI10_tower)	C++17	100 / 100	181 ms	11088 KiB

tower

#include <bits/stdc++.h>
using namespace std;
#define int long long

const int MOD=1e9+9;

signed main() {
	int n,d;
	cin >> n >> d;
	vector<int> ar(n);
	for (int i=0; i<n; i++) { 
        cin >> ar[i]; 
    }
	sort(ar.begin(),ar.end());
	int r=0, ans=1;
	for (int l=0; l<n; l++) {
		while (r<n-1 && ar[r+1]-ar[l]<=d) {
            r++;
        }
		int dist =r-l+1;
		ans=(ans*1LL*dist)%MOD;
	}
	cout << ans << endl;
}

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