这是我的第一篇测试文章

class Solution:
    def maximalSquare(self, matrix: List[List[str]]) -> int:
        n = len(matrix)
        if(n == 0):
            return 0
        m = len(matrix[0])
        res = 0
        for x in range(n):
            for y in range(m):
                if(x == 0 or y == 0):
                    matrix[x][y] = int(matrix[x][y])
                    res = max(res,matrix[x][y])
                    continue
                else:
                    if(matrix[x][y] == "1"):
                        matrix[x][y] = min(matrix[x-1][y],matrix[x][y-1],matrix[x-1][y-1])+1
                        if(matrix[x][y] > res):
                            res = matrix[x][y]
                    else:
                        matrix[x][y] = 0
        return res**2