GPT-o3 综合 严格题归零

```python
def rotate(matrix):
    """
    原地将 N x N 矩阵顺时针旋转 90 度
    """
    n = len(matrix)

    # 1. 沿主对角线转置
    for i in range(n):
        for j in range(i + 1, n):
            matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]

    # 2. 反转每一行
    for i in range(n):
        matrix[i].reverse()

    return matrix


if __name__ == "__main__":
    m1 = [
        [1, 2, 3],
        [4, 5, 6],
        [7, 8, 9]
    ]
    rotate(m1)
    print(m1)
    # [[7, 4, 1], [8, 5, 2], [9, 6, 3]]

    m2