"""# ### 谜题描述 Note that the only differences between easy and hard versions are the constraints on n and the time limit. You can make hacks only if all versions are solved. Slime is interested in sequences. He defined good positive integer sequences p of length n as follows: * For each k>1 that presents in p, there should be at least one pair of indices i,j, such that 1 ≤ i < j ≤ n, p_i = k - 1 and p_j = k. For the given integer n, the set of all good sequences of length n is s_n. For the fixed integer k and the sequence p, let f_p(k) be the number of times that k appears in p. For each k from 1 to n, Slime wants to know the following value: $$$\left(∑_{p∈ s_n} f_p(k)\right)\ mod\ 998 244 353$$$ Input The first line contains one integer n\ (1≤ n≤ 5000). Output Print n integers, the i-th of them should be equal to \left(∑_{p∈ s_n} f_p(i)\right)\ mod\ 998 244 353. Examples Input 2 Output 3 1 Input 3 Output 10 7 1 Input 1 Output 1 Note In the first example, s=\{[1,1],[1,2]\}. In the second example, s=\{[1,1,1],[1,1,2],[1,2,1],[1,2,2],[2,1,2],[1,2,3]\}. In the third example, s=\{[1]\}. Here is a reference code to solve this task. You can use this to help you genereate cases or validate the solution. ```python #include using namespace std; inline bool cmin(int &x, int y) { return x > y ? x = y, 1 : 0; } inline bool cmax(int &x, int y) { return x < y ? x = y, 1 : 0; } const int _ = 5055, mod = 998244353; int N, fac[_], inv[_]; int f[_][_]; int ans[_]; inline int dec(int x) { return x >= mod ? x - mod : x; } inline int Pow(int x, int y = mod - 2) { int ans(1); for (; y; y >>= 1, x = (long long)x * x % mod) if (y & 1) ans = (long long)ans * x % mod; return ans; } int main() { cin >> N; fac[0] = fac[1] = inv[0] = 1; for (int i = 2, I = N; i <= I; ++i) fac[i] = 1ll * fac[i - 1] * i % mod; inv[N] = Pow(fac[N]); for (int i = N, I = 2; i >= I; --i) inv[i - 1] = 1ll * inv[i] * i % mod; f[0][0] = 1; for (int i = 1, I = N; i <= I; ++i) for (int j = 1, I = i; j <= I; ++j) f[i][j] = (1ll * f[i - 1][j] * j + 1ll * f[i - 1][j - 1] * (i - j + 1)) % mod; for (int i = 1, I = N; i <= I; ++i) for (int j = 1, I = N; j <= I; ++j) ans[j] = (ans[j] + 1ll * f[i][j] * inv[i]) % mod; for (int i = 1, I = N; i <= I; ++i) cout << 1ll * ans[i] * fac[N] % mod << \" \"; return 0; } ``` 请完成上述谜题的训练场环境类实现,包括所有必要的方法。 """ from bootcamp import Basebootcamp import re from bootcamp import Basebootcamp MOD = 998244353 class Fslimeandsequenceseasyversionbootcamp(Basebootcamp): def __init__(self, max_n=100): # 默认限制测试用例规模 """ 限制默认max_n以保证生成效率,用户可自行设置更大值 """ self.max_n = min(max_n, 5000) # 强制不超过题目要求的5000上限 def case_generator(self): import random n = random.randint(1, self.max_n) expected = self.compute_answer(n) return {'n': n, 'expected': expected} @staticmethod def compute_answer(n): mod = MOD if n == 0: return [] # 预计算阶乘和逆阶乘 fac = [1]*(n+1) for i in range(1, n+1): fac[i] = fac[i-1] * i % mod inv_fac = [1]*(n+1) inv_fac[n] = pow(fac[n], mod-2, mod) for i in range(n-1, -1, -1): inv_fac[i] = inv_fac[i+1] * (i+1) % mod # 使用滚动数组优化空间 ans = [0]*(n+2) prev = [0]*(n+2) prev[0] = 1 for i in range(1, n+1): curr = [0]*(n+2) for j in range(1, i+1): term1 = prev[j] * j % mod term2 = prev[j-1] * (i-j+1) % mod curr[j] = (term1 + term2) % mod # 实时累加结果,避免存储全表 for j in range(1, i+1): ans[j] = (ans[j] + curr[j] * inv_fac[i]) % mod prev = curr # 滚动更新 # 最终调整 return [ans[j] * fac[n] % mod for j in range(1, n+1)] @staticmethod def prompt_func(question_case): n = question_case['n'] return f"""Given n = {n}, compute the sum of occurrences for each k (1-{n}) in all valid sequences. Enclose your answer in [answer][/answer] tags. Sample format: n=2 → [answer]3 1[/answer] n=3 → [answer]10 7 1[/answer] Rules: 1. For any k>1 in sequence, must have earlier k-1 2. Output n space-separated values mod 998244353 3. Numbers must be in order from k=1 to k={n} Your answer for n={n}:""" @staticmethod def extract_output(output): matches = re.findall(r'\[answer\](.*?)\[\/answer\]', output, re.DOTALL) if not matches: return None last = matches[-1].strip() try: return list(map(int, last.split())) except: return None @classmethod def _verify_correction(cls, solution, identity): expected = identity['expected'] return solution == expected # 测试样例验证 if __name__ == "__main__": # 验证n=2的示例 bootcamp = Fslimeandsequenceseasyversionbootcamp() test_case = {'n': 2} assert bootcamp.compute_answer(2) == [3, 1], "Sample 2 failed" # 验证n=3的示例 test_case = {'n': 3} assert bootcamp.compute_answer(3) == [10, 7, 1], "Sample 3 failed" print("All sample tests passed!")