Submission #1239658

#	Time	Username	Problem	Language	Result	Execution time	Memory
1239658		duckindog	Asceticism (JOI18_asceticism)	C++20	49 / 100	7 ms	16632 KiB

asceticism

#include <bits/stdc++.h>

using namespace std;

const int N = 4'000 + 10,
            M = 1'000'000'007;
int n, k;

int f[N][N];

int32_t main() { 
    cin.tie(0)->sync_with_stdio(0);

    cin >> n >> k;

    f[0][0] = 1;
    for (int i = 1; i <= n; ++i) { 
        for (int j = 1; j <= min(i, k); ++j) { 
            auto& ret = f[i][j];
            ret = (1ll * f[i - 1][j] * j % M);
            ret = (ret + 1ll * f[i - 1][j - 1] * (i - j + 1) % M) % M;
        }
    }
    
    cout << f[n][k] << "\n";
}

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