查找二维数组每一行中的最大值和每一列的最大值

[ [3, 0, 8, 4], 
  [2, 4, 5, 7],
  [9, 2, 6, 3],
  [0, 3, 1, 0] ]

找这个数组的行中最大值和列中的最大值

    int n = ();
	int m = grid[0].size();

    vector<int>col(n, 0);
	vector<int>row(m, 0);
	

	//找出每行中的最大值
	for (int i = 0; i < n; i++)
	{	
		row[i] = grid[i][0];
		
		
		for (int j = 0; j < m; j++)
		{
			if (grid[i][j] > row[i])
			{
				row[i] = grid[i][j];
			}
		}
		
	}
	//找出每列中的最大值
	
	for (int i = 0; i < m; i++)
	{
		col[i] = grid[0][i];
		for (int j = 0; j < n; j++)
		{
			if (grid[j][i] > col[i])
			{
				col[i] = grid[j][i];
			}
			
		}
	}