제출 #516251

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
516251		Evang	A Huge Tower (CEOI10_tower)	C++17	100 / 100	139 ms	2636 KiB

tower

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

const int mod = 1e9+9;

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);

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

	int p = 0;
	long long ans = 1;
	for(int i = 0; i < n; ++i){
		while(a[p]+d<a[i])
			++p;
		ans = ans * (i-p+1)%mod;
	}
	cout << ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
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• Subtask 5: 5 / 5
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• Subtask 19: 5 / 5
• Subtask 20: 5 / 5