leetcode专题训练 73. Set Matrix Zeroes

遍历整个矩阵，如果$matrix[i][j] == 0$matrix[i][j]==0，那么就记下将行号和列号记下。再遍历一遍矩阵，如果当前行数或列数刚刚被记过，那么就将该数置为0。

class Solution:
    def setZeroes(self, matrix: List[List[int]]) -> None:
        """
        Do not return anything, modify matrix in-place instead.
        """

        if not matrix:
            return matrix
        
        l1 = len(matrix)
        l2 = len(matrix[0])
        row = [0 for _ in range(l1)]
        col = [0 for _ in range(l2)]

        for i in range(l1):
            for j in range(l2):
                if matrix[i][j] == 0:
                    row[i] = 1
                    col[j] = 1

        for i in range(l1):
            for j in range(l2):
                if row[i] == 1 or col[j] == 1:
                    matrix[i][j] = 0
        
        return

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标签：Zeroes,Set,return,Matrix,range,l2,l1,row,matrix
来源： https://blog.csdn.net/Ema1997/article/details/104154051