Submission #1249378

#	Time	Username	Problem	Language	Result	Execution time	Memory
1249378		cpismylifeOwO	A Huge Tower (CEOI10_tower)	C++20	100 / 100	77 ms	2628 KiB

tower

#include <bits/stdc++.h>

using namespace std;

const long long mod = 1e9 + 9;
const int MaxN = 1e6 + 5;

int n, d;
int arr[MaxN];

void Inp()
{
    cin >> n >> d;
    for (int x = 1; x <= n; x++)
    {
        cin >> arr[x];
    }
    sort(arr + 1, arr + n + 1);
}

void Exc()
{
    int y = 1;
    long long res = 1;
    for (int x = 1; x <= n; x++)
    {
        while (y < x && arr[y] + d < arr[x])
        {
            y++;
        }
        res = (res * (x - y + 1)) % mod;
    }
    cout << res;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int test = 1;
    //cin >> test;
    for (int x = 1; x <= test; x++)
    {
        Inp();
        Exc();
    }
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
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• Subtask 10: 5 / 5
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• Subtask 16: 5 / 5
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• Subtask 19: 5 / 5
• Subtask 20: 5 / 5