제출 #458156

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
458156		JovanB	A Huge Tower (CEOI10_tower)	C++17	100 / 100	143 ms	8800 KiB

tower

#include <bits/stdc++.h>
using namespace std;
 
using ll = long long;
using ld = long double;
 
const int MOD = 1000000009;
 
int add(int a, int b){ a += b; if(a >= MOD) a -= MOD; return a; }
int mul(int a, int b){ return (1LL*a*b)%MOD; }
 
const int MAXN = 1000000;
 
int a[MAXN+5];
 
int main(){
    ios_base::sync_with_stdio(false), cin.tie(0);
    cout.precision(10);
    cout << fixed;
 
    int n, d;
    cin >> n >> d;
    for(int i=1; i<=n; i++){
        cin >> a[i];
    }
    sort(a+1, a+1+n);
    int res = 1;
    int j = 1;
    for(int i=1; i<=n; i++){
        while(a[i] - a[j] > d) j++;
        res = mul(res, i-j+1);
    }
    cout << res << "\n";
    return 0;
}

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