I was doing sorting array problems and found one of the quick sorting solution extremely fast, and the only difference is the two lines of code in function 1Partition. Wondering why the following two lines of code in 1Partition can greatly improve the performance: Here’s the full source code: } Answer I guess you are doing the question on a
Tag: performance
How to generate unique combinations of the alphabet up to length 6?
I am creating a simple program to see which combination of letters generates the most possible words for the NY Times Spelling Bee puzzle. What I have so far is a text file containing 80,000+ words and the below code which naively selects a required char and then generates a random combination of 6 characters. I then compile my pattern
Vowel counter Java application: stuck in for loops? Doesn’t seem to be an infinite loop
I made a java program to count the number of vowels in a string, and I need to use a, or multiple, for loop(s) to do it for a project. The problem is that it does not do anything, or just takes too long, after inputting the string: I have reduced the number of loops, because the original was very
Accept Duplicate Entry Exception for Performance Benefits?
I am currently programming a news API. To fetch news I am using java to parse XML from a List of RSS Feeds (URLs) and write them to a mysql database. I am doing this at a regular interval i.e. every 5 minutes. As these news feeds often are identical or similar to the prior time fetching I currently get
Fibonacci sequence – How to calculate the sum of the first 100 even-values Fibonacci numbers?
Fibonacci sequence is defined as a sequence of integers starting with 1 and 1, where each subsequent value is the sum of the preceding two I.e. My goal is to calculate the sum of the first 100 even-values Fibonacci numbers. So far I’ve found this code which works perfectly to calculate the sum of even numbers to 4million , however
Split by regex vs multiple one char splits performance
I compared splitting string by regex and by multiple one char splits, using this benchmark and got these results Why splitting by regex is slower than splitting by multiple individual characters, even though they produce the same result? Note: I ran the code on JDK 14.0.2 I used JMH 1.28 Answer String.split implementation has the optimized fast path for splitting
How to reduce the cold start time when using MySQL with Lambda?
I am trying to deploy a REST API with Java, using AWS Lambda, API Gateway and Amazon RDS (MySQL). Below is my Lambda class My pom file Now, checkout the loading time tracked from X Ray, which we usually call as cold start It looks like the init process takes time. When further observed, I noticed most of the time
Function chaining by returning parameter in Java
Seen regularly in the code and quite often used myself mostly to save myself a few lines. so that you can daisy chain the otherwise purely imperative methods in one-liners like as opposed to the classical way There is of course some potential for abuse if you go over board with the daisy chaining like return a(b(c(d(),e(),f(g())), h(i()),j()));, but let’s
Code taking forever to excute when turned to string Java? [closed]
Closed. This question needs debugging details. It is not currently accepting answers. Edit the question to include desired behavior, a specific problem or error, and the shortest code necessary to reproduce the problem. This will help others answer the question. Closed 1 year ago. Improve this question When I change the String m1 to a 2D int array it runs
Using StringBuilder to write XML vs XML library
I already understand from reading different threads that generating your own XML string using a StringBuilder is looked down upon, but the reason usually comes down to escaping characters. I’d like to know if anyone is experienced with XML libraries and writing XML using StringBuilders and know if there is a big difference in performance to writing an XML which