Middle of the Linked List

I am working on the last 2-hour block of the day. My wife was trying to make a payment for our Internet service, but she needs a number that can only be found in a previous bill receipt. Apparently she can not find one, so at the end of the workday we will go to make a payment in person and will hopefully keep the receipt, so this situation does not repeat. Continue reading “Middle of the Linked List”

Java Date and Time

It is a sunny day in the Twin Cities of Minneapolis and St. Paul.

Earlier today I read an article on Medium that described how bad are the crypto currencies and which actors are making money of it. I missed to bookmark the article. While writing this post, in an attempt to locate the article, I did a Google search using the following string: “medium crypto currency”. It returned several articles. I did not spend the time looking for it. That said; if you are investing on crypto currencies, perhaps it would be a good idea to read some of the articles that have reasons why you should stop doing so. That said, I have invested a few dollars on crypto currencies. My reasoning was to better understand what Bitcoin, among other crypto currencies is all about.

Today is the birthday of the wife of one of my wife brothers. We are invited later this afternoon. Hopefully the weather will hold. It is nice to attend a BBQ on a sunny day.

Today and for a few more days, I will attempt to solve some problems in HackerRank. In the past couple years I have concentrated on solving problems from LeetCode. Continue reading “Java Date and Time”

Two Sum – Revisited

It is a very nice sunny day in the Twin Cities of Minneapolis and St. Paul. Today is March 29, 2021 and the high for the day is going to be around 70F. My wife and I talked about grilling chicken for lunch but it is a work day and the process of grilling, eating and cleaning might take a couple hours. That is fine on a holiday.

I decided to attempt to solve all problems in a section of LeetCode. It seems that several problems that I have solved before fall into this collection. I will take a problem from each category a day. Perhaps on weekends I will look at two. Continue reading “Two Sum – Revisited”

Producer and Consumer

Hope you are doing well. I fully understand that not all countries are moving quickly to vaccinate most their population against COVID-19. Hopefully the efforts have already started and will be completed soon. Here in the USA it seems that every state is moving at its own pace. That said, a large amount of people have received at least the first of two jabs. The youngest I know of is of age 21. The world needs to get as much of its population vaccinated as possible to achieve herd immunity. If this is not done the virus will continue to mutate and the threat of COVID-19 might remain for years or decades.

It seems that Israel is leading the vaccination process. As in many other countries, there are some people that do not wish to get vaccinated. The prime minister of Israel has made some clever, and for what I understand legal changes to motivate all their citizens and residents to get a COVID-19 vaccine.

In a nutshell the idea is that the good of the majority needs to prevail. People will not be forced to get a vaccine unless there are medical reasons. Besides that, the population needs to show a vaccine passport to work where there is human contact with others. If the person wishes to attend events and places where they could possibly transmit COVID-19, they need to have a COVID test in the previous 48 hours. The COVID tests used to be free but in the near future people will need to pay for a test. So if a person for without a real medical issue does to get the vaccine but wishes to mix and mingle with others, they will have to pay and get a COVID test every other day. I guess Israel will be one of the countries that will reach heard immunity in the very near future. In my humble opinion, we in the USA need to start thinking about each other and work for a common goal. Continue reading “Producer and Consumer”

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”

Sherlock and GCD

It is a Monday morning and it is garbage collection day so I had to put out on the driveway both bins. The company that provides our development with the service collects every week both garbage and recycle bins. All previous companies that I am familiar with collect garbage every week and recycle every other week. To be honest with you, my wife and I would be fine with recycling once a month and if it was not for the potential for smell during summer, garbage every other week.

Earlier this morning, I saw in my inbox a recommendation for a problem from HackerRank named Sherlock and GCD which maybe solved with a Dynamic Programming approach. Continue reading “Sherlock and GCD”

Construct Binary Search Tree from Pre Order Traversal

It is Thanksgiving Week 2020 and we do not have a winner in the 2020 Presidential Elections yet. The amount of fraud in this year’s elections has been unprecedented. My comment has nothing to do with politics. It is just based on common sense for individuals 12 years of age and older. I have friends and relatives living in different parts of the world. Their confidence and respect in the USA is almost (never generalize) gone.

On multiple occasions and referring to different topics, I have mentioned in this blog a technique used when people want to understand the positions of each other. First both argue on behalf of their own positions. Then, and this is the key of the technique, they switch positions and argue in favor of the opposite position. It is amazing what you can learn about different ideas when you use this technique. The reason for this tends to be based on facts and logic. Continue reading “Construct Binary Search Tree from Pre Order Traversal”

Java Streams and LocalDate

It is Monday November 09, 2020 and it has been a week since the Election Day and the tally of votes is still being adjusted. What a disaster for the USA and friends.

I am not sure why we are not using a voter ID card and limiting voting in person at the polls on Election Day. No exceptions! I am not implying the obvious, but the changes made to the electoral system this year was an open invitation for fraud. Not sure which part of our government is responsible for making sure elections are legal and trustworthy.

If you disagree with the voter ID card and a secure electronic vote at polling sites I would like to provide you with some facts (not opinions) which seem to be all over the news and social media. When you get a credit card via USPS, for your protection, you are asked to call a toll free number and answer a few questions which would allow the credit company to enable the card so you can start charging on it. Credit card companies / banks do not trust the USPS with money. Continue reading “Java Streams and LocalDate”

Path with Minimum Effort – Java

I have been busy with work, reading and experimenting. So far it has been an interesting and rewarding workweek. That said, I am glad that tomorrow is Friday. Due to the COVID-19 pandemic my wife and I do not have big plans for the weekend with the exception of going out for groceries. I assume that you might be in a similar situation.

I decided to tackle LeetCode problem 1631 Path With Minimum Effort. Sometimes I go for the best approach I can came up with. In this case I kind of stopped before implementing it. My first approach timed out as expected. We will discuss the details. My second approach was accepted with a reasonable time. I still want to get one more pass on it but I just do not have time to get that done now. Continue reading “Path with Minimum Effort – Java”

REST API

It is another average fall day in the Twin Cities of Minneapolis and St. Paul. It is sunny and cold. Two more days for the weekend; not that it matters because we are still in the COVID-19 pandemic. That said things appear to be getting better. Hopefully a vaccine will be available soon and we will all get into a new normal.

I am still reading the book Hacker’s Delight by Henry Warren. I have a couple more chapters that I would like to finish before putting it down and starting Get Programming with Node.js by Jonathan Wexler. As I mentioned a few months ago, I will be working on a storage project for my blog. I will start with the APIs and database interface. I decided to use MongoDB for the metadata and the file system for the data. The server part code will be implemented using Node.js in JavaScript. After we have the base functionality we will split the software to work on multiple servers. Once that is done we will move to place the modules in Docker containers and will manage them with Kubernetes. Once all is well, I will see if we can move it to the Azure cloud. After that we will create and integrate additional features. Continue reading “REST API”