August 2020
Intermediate to advanced
508 pages
11h 53m
English
book
A Common-Sense Guide to Data Structures and Algorithms, Second Edition, 2nd Edition
by Jay Wengrow
Content preview from A Common-Sense Guide to Data Structures and Algorithms, Second Edition, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Quickselect
Let’s say you have an array in random order, and you do not need to sort it, but you do want to know the tenth-lowest value in the array, or the fifth-highest. This can be useful if we had a lot of test grades and want to know what the 25th percentile was, or if we want to find the median grade.
One way to solve this would be to sort the entire array and then jump to the appropriate index.
However, even were we to use a fast sorting algorithm like Quicksort, this algorithm would take at least O(N log N) for average cases. And while that isn’t bad, we can do even better with a brilliant little algorithm known as Quickselect. Like Quicksort, Quickselect relies on partitioning, and can be thought of as a hybrid of Quicksort and binary ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.