제출 #1340495

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1340495		greendoubledecker	A Huge Tower (CEOI10_tower)	C++20	30 / 100	216 ms	5260 KiB

tower

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main(){
	ll n, k;
	cin >> n >> k;
	vector<ll> v(n);
	for(ll i = 0; i < n; ++i){
		cin >> v[i];
	}
	sort(v.begin(), v.end());
	ll ans = 1;
	for(ll i = 0; i < n; ++i){
		auto boundary = lower_bound(v.begin(), v.end(), v[i] - k);
		ans *= ((v.end() - boundary) + 1) - (n - i);
	}
	cout << ans << endl;
}

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