Merge Sorted Array

Good morning!  Hope your day has started on the right note. The high temperature in the Twin Cities of Minneapolis and St. Paul is forecasted to be about ten degrees less than yesterday. BTW, yesterday the temperature went up to 61F which is the highest this year so far. My wife and I were planning on grilling yesterday but one thing and the other and I ended having BBQ Chicken Teriyaki from Trader Joe’s. Tasty but I prefer my wife cooking (just making points).

It seems that COVID-19 vaccinations are starting to pick up Minnesota. We are behind other states but the expectations are high. We need to hit herd immunity as soon as possible. It seems that masks and social distancing will be a good idea for people with or without the vaccine for the near future until there is enough data to understand if we will need periodic vaccine boosters or not. Continue reading “Merge Sorted Array”

Largest Triple Products – Revisited

Good morning! It is 04:15 AM and it is a relatively warm day. Last evening before going to bed I decided to hopefully get up a little earlier than usual. I have a permanent alarm on my phone for 06:00 AM. I use it as a fail-safe in case I do not naturally wake up before. Today I wanted to get this post done and take a look at a test I left running overnight. My wife has a doctor’s appointment early today and it is a 45 minute drive from home. She has to fast so I will follow suit. We should be leaving home around 06:45 AM. Continue reading “Largest Triple Products – Revisited”

Clone Graph in Java

It is Friday morning and I am getting on Skype to chat with my best friend. We met when we were attending elementary school. We chat most Fridays but sometimes something comes up and we need to postpone for the following week. All friendships need care and time to maintain. The call occurs at 06:00 AM so hopefully I will have time to get this post done before the call.

The weekend is going to be the warmest of the year so far. We will be around 60F. Most people are going to use their grills or smokers. I believe we will join the group.

I received a message associated with a previous post. I will reply to it later today. The message suggests some improvements to my code. First of all I appreciate the message and suggestion. Please note that in general I want to get a solution up and running and accepted by the web site (e.g., HackerRank, LeetCode). If the solution is too slow, in general I try a second and in some occasions a third approach. I am not going to say that I have the best possible solution. I just want to make sure I describe my approach and you can see my thought process. Continue reading “Clone Graph in Java”

Union Find Java

It is Monday morning. Lots of work associated things for the day so this post will be direct to the point.

As I have previously mentioned, I am in the process of reading Algorithms in C Third Edition Parts 1 – 4 by Robert Sedgewick. I finished the first chapter and wanted to experiment with the content in the book. Yesterday I got VSCode on my machine to compile and execute. I thought I was ready to use the IDE in C. It seems that when I created a new project something did not work. I am currently using the MinGW compiler with VSCode. The issue might be associated with it. I decided that over the next weekend I will remove MinGW and will switch to the Microsoft C/C++ compiler. I do a considerable amount of work using Visual Studio Enterprise 2019 IDE. Have been using Visual Studio for a couple decades and I like it. VSCode is quite similar but yet different. Continue reading “Union Find Java”

Print Words Vertically

It is shortly after 05:00 AM in the Twin Cities of Minneapolis and St. Paul. The temperature is just under 32F. It should go up a few degrees as the day progresses. In reality I am at 68F in my office and not planning on leaving the house today.

I mentioned in a previous post that I had ordered from Amazon three books which would be delivered today Tuesday. The first arrived last Sunday, the second arrived yesterday Monday and just before going to bed I noticed a message from Amazon indicating that I should reorder the third book from a different reseller. One of the books was delivered at my home the second must have been dropped in my mailbox. Will check it at lunch time (after what I said, I guess I will leave the house for a few minutes), and I believe I have to look for the third book again. Continue reading “Print Words Vertically”

Design Linked List

It is Friday evening. It seems that the weeks are going by faster than ever. Hopefully the COVID-19 vaccine will make a huge difference all over the world and we will be able to get on with our lives.

Earlier this week, I decided to add some spice to this blog. If you are a follower you should have noticed that lately most of the problems are being solved in Java. In the near future I will be using C and C++ if such languages would provide simpler and higher performance solutions. That said, if I get a request to generate a solution in Java, I will generate a separate post. Continue reading “Design Linked List”

Making a Larger Island – Java

Hello everybody. I have been very busy looking into a problem at work which seemed to be caused by sockets. It seems that the issue might be related to encryption. Have a couple tests that should verify my assumption. Will let you know if that pan out.

Today in the Twin Cities of Minneapolis and St. Paul we woke up with a temperature above 0F (7F). Looking at the weather forecast it seems like the sub zero temperatures will be a thing of the past in a day or so. Weather forecasts are based on models and models in general are far from perfect, but they provide us with an idea of what might happen in the specified future. Continue reading “Making a Larger Island – Java”

Binary Tree Maximum Path

It is a Saturday morning in what has been forecasted so far as the coldest weekend of this winter season in the Twin Cities of Minneapolis and St. Paul. I woke up this morning around 05:00 AM and the temperature was at -8F. It seems like it will go up a few degrees during the day until it starts dropping down in the mid afternoon. On Sunday we should we waking up to a balmy -20F. My wife and I did our grocery shopping for the week yesterday evening. We are not planning on leaving home this weekend.

Earlier today I read Cybersecurity: Is it Worse than We Think? authored by Chris Maurer, Kevin Kim, Dan J Kim, and Leon Allan Kappelman in the latest Communications of the ACM magazine. The article is interesting, but there was a sentence that called my attention the most. The sentence follows:

“While they [organizations] may be saying the right things in public to satisfy investors, underwriters, and customers, there is an apparent lack of urgency in promoting a truly resilient and secure organization”.

You need to read the article to fully understand the meaning. In my opinion addressing cyber threats requires an investment which has no obvious ROI. Given that the word on the street is that it is not if but when a company will be hacked, then by doing as little as possible and carrying insurance to cover the cost of a breach seems the best approach. Of course if you ask a customer whose PID has been published in the dark web, the sentiments might be quite different. Continue reading “Binary Tree Maximum Path”

Flatten a Linked List in Java

This morning I read the article Kode Vicious Kabin Fever on Viewpoints in the latest copy of the Communications magazine from the ACM. I enjoyed reading the article. All of the points with the only exception to exercise, due to winter and the COVID-19 pandemic, with very few additions, are what I have been doing for over a decade. If you have time and are able to access the article, it contains good advice and it can be read in a few minutes.

Most problems in this blog come from companies such as HackerRank or LeetCode just to mention a few. In this case, the problem came up while chatting with a software engineer. I have developed the requirements as accurate as I can recall. I will be using the Java programming language on a Windows 10 machine using the VSCode IDE. Of course you can generate a solution in a different platform using a different IDE. Continue reading “Flatten a Linked List in Java”

Binary Tree Pruning

Have an on-line call at 02:30 PM. I believe I am well prepared. Will see how it goes.

Earlier today I selected LeetCode 814 Binary Tree Pruning problem.

We are given the head node root of a binary tree, 
where additionally every node's value is either a 0 or a 1.

Return the same tree where every subtree (of the given tree) 
not containing a 1 has been removed.

(Recall that the subtree of a node X is X, plus every node that is a descendant of X.)

Note:

o The binary tree will have at most 200 nodes.
o The value of each node will only be 0 or 1.

We are given a binary tree whose nodes are holding 0 or 1 as value. We need to prune the BT as described in the requirements. If you are interested in this problem please navigate to the LeetCode web site and read the actual requirements. In addition LeetCode has a set of test cases.

In this post we will solve the problem using the Java programming language on a Windows 10 computer using the VSCode IDE. You can use any of the languages supported by LeetCode and solve the problem on the LeetCode side with the IDE provided. Continue reading “Binary Tree Pruning”