Submission #346540

#	Time	Username	Problem	Language	Result	Execution time	Memory
346540		Ca7Ac1	A Huge Tower (CEOI10_tower)	C++17	0 / 100	134 ms	9980 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;

bool cmpr(ll a, ll b)
{
    return a > b;
}

int main()
{
    cin.tie(0);
    cout.tie(0);
    ios_base::sync_with_stdio(0);

    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(), cmpr);

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

        possible[i] = (j - i) % MOD;
    }

    ll sol = 1;
    for (ll mult : possible)
    {
        sol *= mult;
        sol %= MOD;
    }

    cout << sol;
}

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