Submission #1287719

#	Time	Username	Problem	Language	Result	Execution time	Memory
1287719		hynmj	Binaria (CCO23_day1problem1)	C++20	0 / 25	2 ms	1856 KiB

Main

#include <bits/stdc++.h>
#define int long long
using namespace std;
const long long N = 2e5 + 5;
int a[N];
int b[N];
int f[N];
const int mod = 1e6 + 3;
int po(int n, int k = mod - 2)
{
    if (k == 0)
        return 1;
    else if (k & 1)
        return n * po((n * n) % mod, k / 2) % mod;
    return po((n * n) % mod, k / 2);
}
int ncr(int n, int k)
{
    return ((f[n] * po(f[k]) % mod) * po(f[n - k])) % mod;
}
void solve()
{
    int n, k;
    cin >> n >> k;
    for (int i = 0; i < n - k + 1; i++)
    {
        cin >> b[i];
    }
    for (int i = 0; i <= n; i++)
    {
        a[i] = -1;
    }
    for (int i = 0; i + k < n; i++)
    {
        // cout << b[i] << ' ' << b[i + 1] << endl;
        if (b[i] == b[i + 1])
        {
            continue;
        }
        else if (b[i] + 1 == b[i + 1])
        {
            a[i] = 0;
            a[i + k] = 1;
        }
        else if (b[i] == b[i + 1] + 1)
        {
            a[i] = 1;
            a[i + k] = 0;
        }
        else
        {
            cout << 0;
            return;
        }
    }
    int choices = 0;
    int sum = 0;
    for (int i = 0; i < k; i++)
    {
        int l;
        if (a[i] != -1)
        {
            continue;
        }
        l = -1;
        for (int j = i; j < n; j += k)
        {
            if (a[j] != -1)
            {
                l = a[j];
            }
        }

        for (int j = i; j < n; j += k)
        {
            if (a[j] == -1)
            {
                a[j] = l;
            }
            else if (a[j] != l)
            {
                for (int i = 0; i < n; i++)
                {
                    cout << a[i] << ' ';
                }
                return;
                cout << 0;
                return;
            }
        }
    }
    for (int i = 0; i < k; i++)
    {
        if (a[i] == -1)
        {
            choices++;
        }
        else
        {
            sum += a[i];
        }
    }
    // for (int i = 0; i < n; i++)
    // {
    //     cout << a[i] << ' ' << endl;
    // }
    // cout << sum << ' ' << b[0] << endl;
    cout << ncr(choices, b[0] - sum);
}

signed main()
{
    f[0] = 1;
    for (int i = 1; i < N; i++)
    {
        f[i] = (f[i - 1] * i) % mod;
    }
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
    int t = 1;
    // cin >> t;
    for (int i = 1; i <= t; i++)
    {
        // cout << "Case #" << i << ':' << ' ';
        solve();
        cout << endl;
    }
    return 0;
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 3
• Subtask 3: 0 / 4
• Subtask 4: 0 / 4
• Subtask 5: 0 / 4
• Subtask 6: 0 / 7