제출 #1284137

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1284137		ereonzis	A Huge Tower (CEOI10_tower)	C++20	100 / 100	85 ms	2628 KiB

tower

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

#define rep(i, a, b) for (int i = (a); i <= (b); i++)
#define per(i, a, b) for (int i = (b); i >= (a); i--)
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define all(a) (a).begin(), (a).end()
using ll = long long;

const int MOD = 1e9 + 9;

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    int n, d;
    cin >> n >> d;
    vector<int> A(n);
    FOR(i, 0, n) cin >> A[i];
    sort(all(A));
    int p = 0;
    int ans = 1;
    FOR(i, 0, n) {
        while (p < i && A[p] + d < A[i]) p++;
        ans = 1ll * ans * (i - p + 1) % MOD;
    }
    cout << ans << '\n';
    return 0;
}

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