제출 #935990

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
935990		Ponda	A Huge Tower (CEOI10_tower)	C++17	100 / 100	92 ms	11168 KiB

tower

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

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

    int mod = 1000000009, n, d; cin >> n >> d;
    vector<int> blocks(n);
    for (int i = 0; i < n; i++) {
        cin >> blocks[i];
    }
    sort(blocks.begin(), blocks.end());
    int ans = 1; int j = 0;
    for (int i = 0; i < n; i++) {
        while (j < n && blocks[i] + d >= blocks[j]) {
            j++;
        }
        ans = (ans * (j-i) % mod) % mod;
    }
    cout << ans << '\n';
    return 0;
}

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