제출 #1101062

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1101062		0pt1mus23	A Huge Tower (CEOI10_tower)	C++14	100 / 100	96 ms	10572 KiB

tower

#include <bits/stdc++.h>
using namespace std;
#define int long long int
#define ins insert      
#define pb push_back
#define endl '\n'
#define putr(x) cout<<x<<endl;return; 
#define all(x) x.begin(),x.end()
#define _ << " " <<
mt19937 rng(time(0));

const int mod = 1e9 +9,
        sze = 2e5 +23,
        inf = INT_MAX,
        LL = 20;

void _0x0(){
    int n,d;
    cin>>n>>d;
    vector<int> arr(n);
    for(int i=0;i<n;i++){cin>>arr[i];}
    sort(all(arr));
    int ans=1;
    int l=0;
    int r = 0;
    while(l<n){
        while(r<n && arr[r]-arr[l]<=d){
            r++;
        }
        ans=(ans * (r -l )) % mod;
        l++;
    }
    putr(ans);    
}

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    int tt = 1;

    // cin>>tt;
    while(tt--){
        _0x0();
    }
 
    return 0;
}

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