제출 #710063

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
710063		mmaiti	A Huge Tower (CEOI10_tower)	C++11	100 / 100	277 ms	8796 KiB

tower

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

const int MOD = 1e9 + 9;
int main()
{
    int N, D;
    cin >> N >> D;
    vector<int> arr(N);
    for(int i = 0; i < N; i++)
    cin >> arr[i];
    sort(arr.begin(), arr.end());
    int sol = 1, r = 0;
    for(int l = 0; l < N; l++)
    {
        while(r < N - 1 && arr[r+1] <= arr[l] + D) r++;
        int dist = r - l + 1;
        sol = (sol * 1LL * dist) % MOD;
    }
    cout << sol;
}

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