leetcode to do question notes 73 matrix zero

Given a   matrix, if an element is  0  , set all elements in its row and column to  0  . Please use  the in-place  algorithm .m x n

Idea 1: Record row and column values

void setZeroes(int** matrix, int matrixSize, int* matrixColSize){
    int row[matrixSize],col[*matrixColSize];
    for(int i = 0;i<matrixSize;i++)row[i]=0;
    for(int i = 0;i<*matrixColSize;i++)col[i] = 0;
    for(int i = 0;i<matrixSize;i++)
    {
        for(int j = 0;j<*matrixColSize;j++)
        {
            if(matrix[i][j]==0)
            {
                row[i] = 1;
                col[j] = 1;
            }
            
        }
    }
    for(int i = 0;i<matrixSize;i++)
    {
        if(row[i]==1)
        {
           for(int j = 0;j<*matrixColSize;j++)
            {
                matrix[i][j] = 0;
                
            } 
        }
        
    }
    for(int i = 0;i<*matrixColSize;i++)
    {
        if(col[i]==1)
        {
           for(int j = 0;j<matrixSize;j++)
            {
                matrix[j][i] = 0;
                
            } 
        }
        
    }
    return matrix;


}

analyze:

In this question, you can directly record the row and column values, and then change all the numbers in the row or column to 0 according to whether the numbers in the row and column values ​​are 1

Summarize:

This question examines the application of the matrix, which can be solved directly by violence.