제출 #756022

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
756022		taher	A Huge Tower (CEOI10_tower)	C++17	100 / 100	120 ms	2644 KiB

tower

#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "C:\GCC\debug.h"
#else
#define debug(...) void(42)
#endif

const int md = 1000000009;

int add(int &a, int b) {
  a += b;
  if (a > md) {
    a -= md;
  }
  return a;
}

int mult(int a, int b) {
  return (int) ((long long) a * b % md);
}


int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  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 res = 1;
  int low = 0;
  for (int high = 0; high < n; high++) {
    while (a[low] + d < a[high]) {
      ++low;
    }
    debug(high, high, low);
    res = mult(res, high - low + 1);
  }
  cout << res << '\n';
  return 0;
}

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