class Solution:    def generateMatrix(self, n: int) -> List[List[int]]:

def add(x, y) -> int:  return x+y

class Solution:    def generateMatrix(self, n: int):        # 初始化要填充的正方形        matrix = [[0] * n for _ in range(n)]
        left, right, up, down = 0, n - 1, 0, n - 1        number = 1  # 要填充的数字
        while left < right and up < down:
            # 从左到右填充上边            for x in range(left, right):                matrix[up][x] = number                number += 1
            # 从上到下填充右边            for y in range(up, down):                matrix[y][right] = number                number += 1
            # 从右到左填充下边            for x in range(right, left, -1):                matrix[down][x] = number                number += 1
            # 从下到上填充左边            for y in range(down, up, -1):                matrix[y][left] = number                number += 1
            # 缩小要填充的范围            left += 1            right -= 1            up += 1            down -= 1
        # 如果阶数为奇数，额外填充一次中心        if n % 2:            matrix[n // 2][n // 2] = number
        return matrixa = Solution()print(a.generateMatrix(3))

 #删除  -> List[List[int]]:    ，但是不要忘记加 : 哦！（不要问我为什么知道的，呜呜呜）#都是报错带来的血与痛的教训#后面再加上#a = 类名()#print(a.函数名(输入的值))#向这题就打出a = Solution()print(a.generateMatrix(3))#大功告成了！