제출 #1103110

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1103110		zephyrion	A Huge Tower (CEOI10_tower)	C++17	100 / 100	86 ms	5368 KiB

tower

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int mod = 1e9 + 9;

signed main() {
    ios::sync_with_stdio(false); cin.tie(nullptr);
    
    int n, d;
    cin >> n >> d;
    vector<int> arr(n);
    
    for (int i = 0; i < n; i++) {
        cin >> arr[i];
    }
    
    int res = 1;
    sort(arr.begin(), arr.end());
    
    for (int l = 0, r = 0; l < n; l++) {
        for (; r < n && arr[r] - arr[l] <= d; r++) {
            res = res * (r - l + 1) % mod; 
        }
    }
    
    cout << res << endl;
    return 0;
}

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