제출 #886580

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
886580		stefanneagu	A Huge Tower (CEOI10_tower)	C++17	100 / 100	109 ms	12768 KiB

tower

#include <bits/stdc++.h>
#define int long long

using namespace std;

const int nmax = 2e6 + 1, mod = 1e9 + 9;

int v[nmax];

int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie();
  cout.tie();
  int n, h;
  cin >> n >> h;
  for(int i = 1; i <= n; i ++) {
    cin >> v[i];
  }
  sort(v + 1, v + n + 1);
  int ult = 1, ans = 1;
  for(int i = 2; i <= n; i ++) {
    while(v[i] - v[ult] > h) {
      ult ++;
    }
    ans *= i - ult + 1;
    ans %= mod;
  }
  cout << ans;
  return 0;
}

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