Submission #346578

#	Time	Username	Problem	Language	Result	Execution time	Memory
346578		Ca7Ac1	A Huge Tower (CEOI10_tower)	C++17	0 / 100	130 ms	14844 KiB

tower

#include <iostream>
#include <algorithm>
#include <vector>
#include <set>
#include <map>

#define ll signed long long

using namespace std;

const ll MOD = (ll)10e9 + 9;

int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);
    //freopen("tower.in", "r", stdin);

    ll N;
    ll D;
    cin >> N >> D;

    vector<ll> blocks(N, 0);
    for (ll i = 0; i < N; i++)
    {
        cin >> blocks[i];
    }

    sort(blocks.begin(), blocks.end(), greater<ll>());

    vector<ll> place(N, 1);
    ll j = 0;
    for (ll i = 0; i < N; i++)
    {
        while (j < N && blocks[i] - blocks[j] < D)
        {
            j++;
        }

        place[i] = (j - i);
    }

    vector<ll> count(N, 1);
    for (ll i = N - 2; i >= 0; i--)
    {
        count[i] = count[i + 1] * place[i];
        count[i] %= MOD;
    }

    cout << count[0];
}

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