title：Given a m x n matrix, if an element is 0, set its entire
row and column to 0. Do it in place.
解题思路1：初始化两个数组 row[],col[],row[]用来存放第i行是否存在0，col[j]用来存放第j列是否存在0，对于矩阵matrix，if :row[[i]==0||col[j]==0,matrix[i][j]=0;
code：
title：Given a m x n matrix, if an element is 0, set its entire
row and column to 0. Do it in place.
解题思路1：初始化两个数组 row[],col[],row[]用来存放第i行是否存在0，col[j]用来存放第j列是否存在0，对于矩阵matrix，if :row[[i]==0||col[j]==0,matrix[i][j]=0;
code：