제출 #680282

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
680282		peijar	A Huge Tower (CEOI10_tower)	C++17	100 / 100	167 ms	11180 KiB

tower

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

namespace std {
template <typename T> ostream &operator<<(ostream &out, const vector<T> &vec) {
  out << "[";
  for (int i = 0; i < (int)vec.size(); ++i) {
    out << vec[i];
    if (i + 1 < (int)vec.size())
      out << ", ";
  }
  return out << "]";
}
} // namespace std

void dbg_out() { cout << endl; }
template <typename Head, typename... Tail> void dbg_out(Head H, Tail... T) {
  cout << ' ' << H;
  dbg_out(T...);
}

#ifdef DEBUG
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

const int MOD = 1e9 + 9;
signed main(void) {
  ios_base::sync_with_stdio(false);
  cin.tie(0);

  int N, d;
  cin >> N >> d;
  vector<int> a(N);
  for (int &x : a)
    cin >> x;
  sort(a.begin(), a.end());
  dbg(a);
  int sol = 1;

  for (int i = 1; i < N; ++i) {
    int from = lower_bound(a.begin(), a.end(), a[i] - d) - a.begin();
    dbg(i, from);
    sol = sol * (i - from + 1) % MOD;
  }
  cout << sol << endl;
}

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