"""# ### 谜题描述 John Doe has found the beautiful permutation formula. Let's take permutation p = p1, p2, ..., pn. Let's define transformation f of this permutation: where k (k > 1) is an integer, the transformation parameter, r is such maximum integer that rk ≤ n. If rk = n, then elements prk + 1, prk + 2 and so on are omitted. In other words, the described transformation of permutation p cyclically shifts to the left each consecutive block of length k and the last block with the length equal to the remainder after dividing n by k. John Doe thinks that permutation f(f( ... f(p = [1, 2, ..., n], 2) ... , n - 1), n) is beautiful. Unfortunately, he cannot quickly find the beautiful permutation he's interested in. That's why he asked you to help him. Your task is to find a beautiful permutation for the given n. For clarifications, see the notes to the third sample. Input A single line contains integer n (2 ≤ n ≤ 106). Output Print n distinct space-separated integers from 1 to n — a beautiful permutation of size n. Examples Input 2 Output 2 1 Input 3 Output 1 3 2 Input 4 Output 4 2 3 1 Note A note to the third test sample: * f([1, 2, 3, 4], 2) = [2, 1, 4, 3] * f([2, 1, 4, 3], 3) = [1, 4, 2, 3] * f([1, 4, 2, 3], 4) = [4, 2, 3, 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; const int di[] = {-1, 0, 1, 0}; const int dj[] = {0, 1, 0, -1}; const long long MOD = 1e9 + 7; const long long INF = 1e9; const double EPS = 1e-5; int main() { ios::sync_with_stdio(false), cin.tie(0); int n; cin >> n; deque num(n); for (int i = 0; i < n; i++) num[i] = i + 1; for (int shft = 2; shft <= n; shft++) { int last = num[0]; for (int i = shft; i < n; i += shft) swap(num[i], last); num.pop_front(); num.push_back(last); } for (int i = 0; i < n; i++) cout << num[i] << \" \n\"[i == n - 1]; cin.ignore(), cin.get(); } ``` 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 import random from collections import deque from bootcamp import Basebootcamp class Bshiftingbootcamp(Basebootcamp): def __init__(self, **params): """ 参数有效性检查:确保2 ≤ min_n ≤ max_n ≤ 1e6 """ self.min_n = max(2, params.get('min_n', 2)) self.max_n = min(10**6, params.get('max_n', 100)) super().__init__(**params) def case_generator(self): """ 严格保证生成的n在[2, 1e6]范围内 """ n = random.randint(self.min_n, self.max_n) return {'n': n} @staticmethod def prompt_func(question_case): n = question_case['n'] return f"""Find the beautiful permutation for n={n} by applying sequential transformations for k=2 to n. Each transformation divides the permutation into k-length blocks and left-rotates each block. Output format: space-separated numbers within [answer] tags. Example for n=4: [answer] 4 2 3 1 [/answer]""" @staticmethod def extract_output(output): # 增强提取逻辑:允许任意分隔符和空格 matches = re.findall(r'\[answer](.*?)\[/answer]', output, re.DOTALL | re.IGNORECASE) if not matches: return None # 提取最后一个answer块并规范化格式 raw_answer = matches[-1].strip() processed = re.sub(r'[^\d]', ' ', raw_answer) # 非数字转空格 processed = re.sub(r'\s+', ' ', processed).strip() # 合并空格 return processed @classmethod def _generate_correct_answer(cls, n): """严格遵循C++参考实现逻辑""" num = deque(range(1, n+1)) for k in range(2, n+1): if len(num) == 0: break last = num[0] i = k while i < n: # 注意这里是原始n值,不是当前deque长度 if i < len(num): num[i], last = last, num[i] i += k num.popleft() num.append(last) return list(num) @classmethod def _verify_correction(cls, solution, identity): n = identity['n'] try: # 严格验证数字集合和顺序 user_ans = list(map(int, solution.split())) correct = cls._generate_correct_answer(n) return user_ans == correct except: return False