제출 #1125510

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1125510		njoop	A Huge Tower (CEOI10_tower)	C++17	100 / 100	130 ms	5312 KiB

tower

#include <bits/stdc++.h>
#define int long long
using namespace std;

int n, d, arr[1000010], dp[1000010], ans=1, mod=1e9+9;

signed main() {
    cin.tie(0)->sync_with_stdio(0);
    cin >> n >> d;
    for(int i=0; i<n; i++) {
        cin >> arr[i];
    }
    sort(arr, arr+n);
    for(int i=0; i<n; i++) {
        int p = lower_bound(arr, arr+n, arr[i]-d)-arr;
        ans *= i-p+1;
        ans %= mod;
    }
    cout << ans;
    return 0;
}

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