Hackerrank java threads

You are viewing a single comment's thread. I'm quite new to java so i'm not getting it. This is not a particular java thing.

hackerrank java threads

It's regex. It means "one or more times". You may find Java's Pattern documentation helpful. Exception in thread "main" java. NoSuchElementException: No line found still showing this error for 9th test case. Im having the same issue. I've tried a ton of different submissions. I've even tried catching the exception but nothing will work.

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By the way nice explanation thank you. This worked. But if you could please explain to me what is the difference between this and the following mentioned below - s.

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It iterates through all the elements in that particular array. The hasNext is a method of Java Scanner class which returns true if this scanner has another token in its input. So, it will check for the any token as an input.

This form is a kind of regular expression. You don't need to know about regular expressions - just use the template shown here. To see what the tokens are, just use a for loop:. These tasks are there to learn the basics about Java. Using a specialized Class like StringTokenizer pretty much ruins your learning experience. It's like reversing a String with StringBuilder.

I do not see anything wrong with using Java library classes such as StringBuilder unless you have a specific reason to avoid such as not using SimpleDateFormat or Calendar.

If your goal is to learn Java, get familiar with the nuances of all the APIs instead of reinventing the wheel.

If your goal is to use Java to practice data structures and algorithms, then yes, don't use libraries. Having said that, at work, you will be encouraged to use java libraries instead of writing your own version no matter how good you are. If not, then I will write that too on my own. Using the api is a learning experience. No job will want you to write code that is already in the API. What these excercises do is teaches you how to look up stuff in the api so you can learn what tools are available that are out of the box.

How do you know the API is plenty of times slower? I have never seen time complexity listed for an api algorithm. And why would people who are actually developing the language would make solutions that are not optimal? I think using the API is fine, and in this case, more than likely the API solution is no different than most people's solution here. They make suboptimal solutions for the same reasons people make suboptimal solutions all the time. I suppose.This will allow students to navigate the repo structure easily, without having to come back to the main repo each time.

Samples codes which includes coding practice such as for hacker rank, stack overflow etc. Hey, you can contribute to this repo by Adding HackerRank interview Solutions in different Programing Languages so that one can get help from it. My solutions to HackerRank problems. Feel free to FORK. Happy coding :. This Repository is for the Solutions of available Algorithm problems in Java. In this repository I will include solutions to all the problems that I have solved on Hackerrank.

Add a description, image, and links to the hackerrank-java topic page so that developers can more easily learn about it. Curate this topic. To associate your repository with the hackerrank-java topic, visit your repo's landing page and select "manage topics. Learn more. Skip to content. Here are 64 public repositories matching this topic Language: All Filter by language.

Sort options. Star Code Issues Pull requests. Updated Feb 2, Java. Updated Oct 12, Python. Updated Oct 5, Java.

hackerrank java threads

Open Add "next", "previous" and "main menu" links to each directory. Read more. Open A small documentation change. In this repo i share the solution of problems in hackerrank. Updated Jan 23, Java. Updated Apr 11, Java. Updated Feb 23, Java. Star 5. Updated Jul 4, Java.

Star 4. Updated Mar 28, C. Star 3. Find solutions to challenging Hackerrank problems here! Updated Mar 1, Java.

Java solutions for HackerRank problems. Updated Jun 11, Java. Star 2. Solutios for competitive problems in different sites.Post a Comment. Pages Home Who am I. Given an array of integers, find the max value for each contiguous subarray in it sized k. I didn't like much this requisite.

As a TDD developer, I'm used to let tests drive the code development.

hackerrank-java

And having to check standard output to verify a function behavior is not fun. So I slightly changed the function signature, asking to return a vector containing the results, and I used the original function as a simple adapter to the original problem.

For each subarray find its maximum value ad push it to the result vector. However, for k comparable to a large n we can say bye bye to performance. Initialize the result vector with the max element for the first interval. Keep beg and end as loop variable, describing the current window to check.

The new right element of the window is bigger than the max for the previous window.

hackerrank java threads

Surely it is the max for this one. The element that has just left the window is smaller than the previous max. Surely the max is still in the window. Otherwise, we'd better check which is the current max. A smartly designed array in input could beat this simple algorithm. However on HackerRank they didn't spend too much time on this matter, and this solution is accepted with full marks.

Solution with a deque In a more elegant solution, we should to minimize the multiple check we perform on the data elements. Right, but how? Until this moment, I haven't paid attention to the huge hint HackerRank gave us, "Use a deque!

The point is that I want to perform a cheap cleanup on each window, so that I could just pick a given element in it, without scanning the entire interval. Let's use the deque as a buffer to store only the reasonable candidates as max. Since we want to remove from this buffer the candidates that are not anymore valid when the window is moved, instead of their value we keep in it their indices from the original data array.

We could safely say that the first element in data is a good candidate as max for its first subarray. Push back to candidates the "i" index from data, but first ensure the previous candidates are useful. There is no use in a candidate, if the newcomer is bigger, so remove it. Now candidates contains the indices of all the elements in the first window on data having the max value.

Possibly just one element, but for sure the deque is not empty.

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As said above, we know that candidates is not empty and its front is the index of a max value in the current window. Push it to results. Now we prepare for the next window. If the front candidate is out, we remove it.This will allow students to navigate the repo structure easily, without having to come back to the main repo each time. Samples codes which includes coding practice such as for hacker rank, stack overflow etc.

Hey, you can contribute to this repo by Adding HackerRank interview Solutions in different Programing Languages so that one can get help from it. My solutions to HackerRank problems.

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Feel free to FORK. Happy coding :.

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This Repository is for the Solutions of available Algorithm problems in Java. In this repository I will include solutions to all the problems that I have solved on Hackerrank. Add a description, image, and links to the hackerrank-java topic page so that developers can more easily learn about it. Curate this topic. To associate your repository with the hackerrank-java topic, visit your repo's landing page and select "manage topics.

hackerrank-java

Learn more. Skip to content. Here are 61 public repositories matching this topic Language: All Filter by language. Sort options. Star Code Issues Pull requests.

Updated Feb 2, Java. Updated Oct 12, Python. Updated Oct 5, Java. Open Add "next", "previous" and "main menu" links to each directory.Problem: Lily has a chocolate bar consisting of a row of n squares where each square has an integer written on it. She wants to share it with Ron for his birthday, which falls on month m and day d. Lily only wants to give Ron a piece of chocolate if it contains m consecutive squares whose integers sum to d.

Input Format The first line contains an integer denoting n the number of squares in the chocolate bar. The second line contains n space-separated integers describing the respective values of s 0 ,s 1. Output Format Print an integer denoting the total number of ways that Lily can give a piece of chocolate to Ron. There are no possible pieces satisfying these constraints: Birthday Choclate 1 Hackerank Solution. Because the only square of chocolate in the bar satisfies this constraint, we print 1 as our answer.

Solution Video. Arrays; import java. Challenge Name: Breaking the Records Problem: Lily has a chocolate bar consisting of a row of n squares where each square has an integer written on it.

Birthday Choclate 1 Hackerank Solution. Arrays ; import java. Iconic One Theme Powered by Wordpress.Multi-threaded programs may often come to a situation where multiple threads try to access the same resources and finally produce erroneous and unforeseen results.

So it needs to be made sure by some synchronization method that only one thread can access the resource at a given point of time. Java provides a way of creating threads and synchronizing their task by using synchronized blocks. Synchronized blocks in Java are marked with the synchronized keyword. A synchronized block in Java is synchronized on some object. All synchronized blocks synchronized on the same object can only have one thread executing inside them at a time. All other threads attempting to enter the synchronized block are blocked until the thread inside the synchronized block exits the block.

This synchronization is implemented in Java with a concept called monitors. Only one thread can own a monitor at a given time. When a thread acquires a lock, it is said to have entered the monitor. All other threads attempting to enter the locked monitor will be suspended until the first thread exits the monitor. In the above example, we chose to synchronize the Sender object inside the run method of the ThreadedSend class.

Alternately, we could define the whole send block as synchronized and it would produce the same result.

Birthday Chocolate Hackerrank algorithm Solution in java

We do not always have to synchronize a whole method. Sometimes it is preferable to synchronize only part of a method. Java synchronized blocks inside methods makes this possible.

This article is contributed by Souradeep Barua. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above. Writing code in comment? Please use ide. Thread class in Java What does start function do in multithreading in Java? RecursiveAction class in Java with Examples Java.

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Improved By : DeepakMathuria. Load Comments.Please Login in order to post a comment. One reminder, PriorityQueue is not a queue, it is a heap instead! It works on a "just in time" basis, if you just want to print out individual element, the elements won't be in sorted order. Instead, you have to pull the items off the queue once at a time with poll. And you need to check if the queue is empty before remove. I think I see this exact problem somewhere else on hackerrank also.

Maybe they just moved it. The only difference is in the case if the queue is empty. In that case, poll returns null value and remove throws NoSuchElementException.

Hi all! Thanks for the great solution! An interesting detail, that "in. In local IDE the code-line below could solve the "Exception in thread "main" java. InputMismatchException" exception:. Thank you for that while statement! I was struggling trying to get Maria and Shafayet in the right order.

You get a gold star.

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A good explanation on how to preserve order while converting to a List. Is there some place in the problem description where it specifies the names need to be output in the sorted order? I certainly didn't see any such place. My code gets all the names right but it prints Maria and Shafaet in the opposite order from what the verifier wants them.

Why is that a problem? I also stumbled a bit over wrong order of Maria and Shafayet. This might help: Iterator of the PriorityQueue"The iterator does not return the elements in any particular order. Thank you so much for this. I probably had the right lambda expression the entire time and wasted a lot of time on it not printing correctly due to this. Thankfully, this caused me to come to the discussions and I found the much cleaner Java 8 Comparator solution. Thank you for this as it helped me get a working solution.

It's a detail that's very easy to overlook in the documentation I certainly know i overlooked it We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies. Practice Compete Jobs Leaderboard.

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