Submission #1370742

#	Time	Username	Problem	Language	Result	Execution time	Memory
1370742		chikien2009	Asceticism (JOI18_asceticism)	C++20	49 / 100	5 ms	12612 KiB

asceticism

#include <bits/stdc++.h>

using namespace std;

void setup()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

const long long mod = 1e9 + 7;

int n, k;
long long f[3001][3001];

int main()
{
    setup();

    cin >> n >> k;
    f[0][1] = 1;
    for (int i = 1; i <= n; ++i)
    {
        for (int j = 1; j <= k; ++j)
        {
            f[i][j] = (f[i - 1][j] * j + f[i - 1][j - 1] * (i + 1 - j)) % mod;
        }
    }
    cout << f[n][k];
    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 20 / 20
• Subtask 3: 25 / 25
• Subtask 4: 0 / 51