제출 #394534

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
394534		__SIGSEGV__	A Huge Tower (CEOI10_tower)	C++17	100 / 100	136 ms	5444 KiB

tower

#include <bits/stdc++.h>

using namespace std;

constexpr long long mod = 1e9 + 9;

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  int n, d;
  cin >> n >> d;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  sort(a.begin(), a.end());
  long long answer = 1;
  int l = 0;
  for (int r = 1; r < n; r++) {
    while (l < r && a[r] - a[l] > d) {
      ++l;
    }
    answer = answer * (r - l + 1) % mod;
  }
  cout << answer << '\n';
  return 0;
}

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