제출 #868156

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
868156		overwatch9	A Huge Tower (CEOI10_tower)	C++17	20 / 100	1066 ms	54908 KiB

tower

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
using ll = long long;
const int mod = 1e9 + 9;
vector <ll> dp, nums;
int n, d;
ll solve(int i) {
    if (i == 0)
        return 1;
    if (dp[i] != -1)
        return dp[i];
    ll ans = solve(i-1);
    for (int j = i-1, x = 1; j > 0; j--, x++) {
        if (j > 0 && nums[j] + d < nums[i])
            break;
        ans += solve(j) * x;
        ans %= mod;
    }
    dp[i] = ans;
    return ans;
}
int main() {
    cin >> n >> d;
    dp.resize(n+1, -1);
    nums.resize(n+1);
    for (int i = 1; i <= n; i++)
        cin >> nums[i];
    sort(nums.begin(), nums.end());
    cout << solve(n) << '\n';
}

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