螺旋矩阵

def solve():
    matrix = [[____,____,____],[____,____,____],[____,____,____]]
    if not matrix:
        print(____)
        return
    m, n = len(____), len(____)
    top, bottom, left, right = ____, m-____, ____, n-____
    result = []
    while top <= bottom and left <= right:
        for j in range(____):
            result.append(____)
        top += ____
        for i in range(____):
            result.append(____)
        right -= ____
        if top <= bottom:
            for j in range(____):
                result.append(____)
            bottom -= ____
        if left <= right:
            for i in range(____):
                result.append(____)
            left += ____
    print(____)