제출 #1332008

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1332008		timeforclock	A Huge Tower (CEOI10_tower)	C++20	100 / 100	244 ms	9868 KiB

tower

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

const ll MOD = (ll)(1e9 + 9);

int main() {
	ll N, d; cin >> N >> d;
    vector<ll> a(N);
    for (ll i = 0; i < N; i++) cin >> a[i];
    sort(a.begin(), a.end());
    vector<ll> dp(N); dp[0] = 1;

    for (ll i = 1; i < N; i++) {
        ll r = i;
        for (int x = i; x >= 1; x /= 2){
            while (r-x >= 0 && a[i]-a[r-x] <= d) r -= x;
        }
        dp[i] = (dp[i-1]*(i-r+1)) % MOD;
    }

    cout << dp.back();
}

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