用python写出m*n的蛇形矩阵，多种方式

方法一：使用二维列表

def snake_matrix(m, n):
    matrix = [[0] * n for _ in range(m)]
    num = 1
    for i in range(m):
        if i % 2 == 0:
            for j in range(n):
                matrix[i][j] = num
                num += 1
        else:
            for j in range(n - 1, -1, -1):
                matrix[i][j] = num
                num += 1
    return matrix

方法二：使用一维列表

def snake_matrix(m, n):
    matrix = [0] * (m * n)
    num = 1
    for i in range(m):
        if i % 2 == 0:
            for j in range(n):
                matrix[i * n + j] = num
                num += 1
        else:
            for j in range(n - 1, -1, -1):
                matrix[i * n + j] = num
                num += 1
    return [matrix[i * n:(i + 1) * n] for i in range(m)]

方法三：使用numpy数组

import numpy as np

def snake_matrix(m, n):
    matrix = np.zeros((m, n), dtype=int)
    num = 1
    for i in range(m):
        if i % 2 == 0:
            for j in range(n):
                matrix[i][j] = num
                num += 1
        else:
            for j in range(n - 1, -1, -1):
                matrix[i][j] = num
                num += 1
    return matrix