제출 #1304695

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1304695		naperiggers	A Huge Tower (CEOI10_tower)	C++20	100 / 100	106 ms	5184 KiB

tower

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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    long long mod = 1e9 + 9;
    int n;
    long long d;
    cin >> n >> d;
    vector<long long> a(n);
    for (auto &x : a) cin >> x;
    sort(a.begin(), a.end());
    long long ans = 1; 
    for (int i = 0; i < n; i++) {
        long long limit = a[i] + d;
        long long cnt = upper_bound(a.begin(), a.end(), limit) - (a.begin() + i);
        ans = (ans*cnt)%mod;
    }

    cout << ans << "\n";
    return 0;
}

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