제출 #930969

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
930969		guagua0407	A Huge Tower (CEOI10_tower)	C++17	100 / 100	208 ms	2896 KiB

tower

//#pragma GCC optimize("O3")
#include <vector>
#include<iostream>
#include<algorithm>
using namespace std;
const int mod=1e9+9;

int main() {
    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 l=0;
    int ans=1;
    for(int r=0;r<n;r++){
        while(a[l]+d<a[r]){
            l++;
        }
        ans=1ll*ans*(r+1-l)%mod;
    }
    cout<<ans<<'\n';
    return 0;
}

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