제출 #1103087

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1103087		fyan	A Huge Tower (CEOI10_tower)	C++14	100 / 100	87 ms	11984 KiB

tower

#include "bits/stdc++.h"
using namespace std;
#define int long long
#define all(x) begin(x), end(x)
#define sz(x) (int) (x).size()

const int mxN=1e7,MOD=1e9+9;

int N,D,a[mxN],c[mxN],res=1;

signed main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);
	
	cin>>N>>D;
	for (int i=0; i<N; i++)
		cin>>a[i];
	sort(a,a+N);
	for (int l=0,r=0; l<N; l++)
		for (; r<N && a[r]-a[l]<=D; r++)
			res=res*(r-l+1)%MOD;
	cout<<res;
	
	return 0;
}

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