제출 #1341299

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1341299		heimaodedog	A Huge Tower (CEOI10_tower)	C++20	100 / 100	85 ms	2628 KiB

tower

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

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

    int n, k, idx = 0; cin >> n >> k;
    ll result = 1;
    vector<int> blocks(n);
    for (int i = 0; i < n; i++) cin >> blocks[i];
    sort(blocks.begin(),blocks.end());
    for (int i = 0; i < n; i++)
    {
        while (idx < n && blocks[idx] - blocks[i] <= k)
        {
            idx++;
        }
        result *= idx - i;
        result %= 1000000009;
    }
    cout << result;
    return 0;
}

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