제출 #1254423

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1254423		classic	A Huge Tower (CEOI10_tower)	C++20	100 / 100	78 ms	2628 KiB

tower

#include <bits/stdc++.h>

const int MOD = 1E9 + 9;

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

    int N, D;
    std::cin >> N >> D;

    std::vector<int> a(N);
    for (int i = 0; i < N; i++) {
        std::cin >> a[i];
    }

    sort(a.begin(), a.end());

    int ans = 1;
    for (int i = 0, j = 0; i < N; i++) {
        while (j + 1 < N && a[j + 1] <= a[i] + D) {
            j++;
        }
        ans = (1LL * ans * (j - i + 1)) % MOD;
    }

    std::cout << ans << "\n";

    return 0;
}

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