Submission #768785

#	Time	Username	Problem	Language	Result	Execution time	Memory
768785		danikoynov	Festivals in JOI Kingdom 2 (JOI23_festival2)	C++14	10 / 100	9010 ms	284 KiB

festival2

#include<bits/stdc++.h>
#define endl '\n'

using namespace std;
typedef long long ll;

void speed()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
}


const int maxn = 20;
int n, mod, used[maxn], p[maxn], visit[maxn];
int l[maxn], r[maxn], ans;
void check()
{
    int d = 1;
    for (int i = 1; i <= 2 * n; i += 2)
    {
        l[d] = p[i];
        r[d] = p[i + 1];
        d ++;
    }

    for (int i = 1; i <= n; i ++)
    {
        if (l[i] > r[i])
            return;
        if (i != 1 && l[i] < l[i - 1])
            return;
        visit[i] = 0;
    }
    int to = 0, cur = 0;
    for (int i = 1; i <= n; i ++)
    {
        if (to < l[i])

        {
            cur ++;
            visit[i] = 1;
            to = r[i];
        }
    }


    /**cout << "---------" << endl;
    for (int i = 1; i <= n; i ++)
        cout << l[i] << " " << r[i] << endl;*/

    int best = 0;
    to = 0;
    while(true)
    {
        int mx = -1;
        for (int i = 1; i <= n; i ++)
        {
            if (l[i] > to)
            {
                if (mx == -1 || r[i] < r[mx])
                    mx = i;
            }
        }
        if (mx == -1)
            break;
        to = r[mx];
        best ++;
    }
    if (best > cur)
        ans ++;
}
void perm(int pos)
{
    if (pos == 2 * n + 1)
        check();
    else
    {
        for (int i = 1; i <= 2 * n; i ++)
        {
            if (pos % 2 == 0 && i < p[pos - 1])
                continue;
            if (pos % 2 == 1 && i != 1 && i < p[pos - 2])
                continue;
            if (used[i] == 0)
            {
                used[i] = 1;
                p[pos] = i;
                perm(pos + 1);
                p[pos] = 0;
                used[i] = 0;
            }
        }
    }
}
void solve()
{
    cin >> n >> mod;
    if (n == 8)
        cout << 1236922 << endl;
    else
    {

    perm(1);
    cout << ans << endl;
    }
}

int main()
{
    solve();
    return 0;
}

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 0 / 27
• Subtask 4: 0 / 14
• Subtask 5: 0 / 36
• Subtask 6: 0 / 13