제출 #990966

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
990966		i_liek_cheezits	A Huge Tower (CEOI10_tower)	C++17	100 / 100	82 ms	2652 KiB

tower

#include <bits/stdc++.h>
using namespace std;
#define fastIO ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
const int MOD = 1e9+9;
int main() {
  fastIO
  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());
  int r = 0;  int ans = 1;
  for (int l = 0; l < n; l++) {
   	while (r<n-1 && a[r+1]-a[l] <= d) r++;
    int count = r-l+1;
    ans = (ans * 1LL * count) % MOD;
  }
  cout << ans << '\n';
}

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