제출 #1086372

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1086372		juicy	A Huge Tower (CEOI10_tower)	C++17	100 / 100	84 ms	8784 KiB

tower

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

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

  const int M = 1e9 + 9;

  int n, d; cin >> n >> d;
  vector<int> a(n);
  for (int &x : a) {
    cin >> x;
  }
  sort(a.begin(), a.end());
  int res = 1;
  for (int i = 0, j = 0; i < n; ++i) {
    while (a[i] - a[j] > d) {
      ++j;
    }
    res = (long long) res * (i - j + 1) % M;
  }
  cout << res;
  return 0;
}

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