Leetcode1006笨阶乘

思路：以4为一个分组分别进行处理

class Solution:
    def clumsy(self, n: int) -> int:
        answer_dict = {0:0,1: 1, 2: 2, 3: 6, 4: 7}
        if n > 4:
            answer = n * (n - 1) // (n - 2) + n - 3
            n -= 4
        else:
            print(answer_dict[n])
            return answer_dict[n]
        print(answer)
        while n >=4:
            current_answer = n * (n - 1) // (n - 2) - n + 3
            answer -= current_answer
            n -= 4
            print(answer,n)
        answer-=answer_dict[n]
        print(answer)
        return answer