LeetCode 1504. Count Submatrices With All Ones in Java

In this post we will solve LeetCode 1504. Count Submatrices With All Ones problem using the Java programming language, the VSCode IDE on a Windows computer. My suggestion to you is that unless you have some special set of requirements, use the online IDE provided by LeetCode.

Given an m x n binary matrix mat, 
eturn the number of submatrices that have all ones.


o 1 <= m, n <= 150
o mat[i][j] is either 0 or 1.

Related Topics:

o Array
* Dynamic Programming
o Stack
o Matrix
o Monotonic Stack

In this problem we are provided a two dimensional matrix that only contains 1s and 0s. The dimensions are specified by `n` and `m`. Our mission if we wish to accept it, is to return the number of submatrices of 1s. Continue reading “LeetCode 1504. Count Submatrices With All Ones in Java”

Sort the Matrix Diagonally in Java

Good morning. It is Sunday again. I woke up around 05:00 AM and the outside temperature was -17 F. We are finally experiencing cold winter days in the Twin Cities of Minneapolis and St. Paul. An added bonus for football fans is that today is Super Bowl LV. My wife and I are not sports fans. We like to bike and walk and occasionally scuba dive. Up to a couple years ago we would watch the half time show. We so not watch TV any more. Perhaps we will find the half time show on YouTube. Continue reading “Sort the Matrix Diagonally in Java”

Matrix Layer Rotation

I am moving along with a project at work. I have completed the first pass. I am now optimizing the code and testing the system as a whole. As soon as I am done will move to replacing a component with a machine learning (ML) model. I am planning on developing the model using Azure. I would like to see if it is better that using OCR (Optical Character Recognition). Will let you know the results later this month.

I decided to give a try to the HackerRank Matrix Layer Rotation challenge. The challenge is rated HARD and worth 80 points. If interested take a look at the requirements. If interested you can read about how I addressed the problem in this post. Continue reading “Matrix Layer Rotation”