제출 #964495

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
964495		12345678	A Huge Tower (CEOI10_tower)	C++17	100 / 100	93 ms	8888 KiB

tower

#include <bits/stdc++.h>

using namespace std;

#define ll long long

const int mod=1e9+9;

ll n, d, ans=1, x;

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>d;
    vector<int> v(n);
    for (auto &x:v) cin>>x;
    sort(v.begin(), v.end());
    for (int i=0; i<n; i++)
    {
        while (v[x]+d<v[i]) x++;
        ans=(ans*(i-x+1))%mod;
    }
    cout<<ans;
}

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