Theoretical computer science | Trees (graph theory)
In graph theory and computer science, the lowest common ancestor (LCA) (also called least common ancestor) of two nodes v and w in a tree or directed acyclic graph (DAG) T is the lowest (i.e. deepest) node that has both v and w as descendants, where we define each node to be a descendant of itself (so if v has a direct connection from w, w is the lowest common ancestor). The LCA of v and w in T is the shared ancestor of v and w that is located farthest from the root. Computation of lowest common ancestors may be useful, for instance, as part of a procedure for determining the distance between pairs of nodes in a tree: the distance from v to w can be computed as the distance from the root to v, plus the distance from the root to w, minus twice the distance from the root to their lowest common ancestor. In ontologies, the lowest common ancestor is also known as the least common ancestor. In a tree data structure where each node points to its parent, the lowest common ancestor can be easily determined by finding the first intersection of the paths from v and w to the root. In general, the computational time required for this algorithm is O(h) where h is the height of the tree (length of longest path from a leaf to the root). However, there exist several algorithms for processing trees so that lowest common ancestors may be found more quickly. Tarjan's off-line lowest common ancestors algorithm, for example, preprocesses a tree in linear time to provide constant-time LCA queries. In general DAGs, similar algorithms exist, but with super-linear complexity. (Wikipedia).
Highest Common Factor & Lowest Common Multiple - GCSE Mathematics
How to find the highest common factor and lowest common multiple (hcf and lcm) of any two numbers using prime factors. ❤️ ❤️ ❤️ Support the channel ❤️ ❤️ ❤️ https://www.youtube.com/channel/UCf89Gd0FuNUdWv8FlSS7lqQ/join
From playlist Number
Lowest Common Ancestor (LCA) Problem | Source Code
Source code explanation video of the Lowest Common Ancestor (LCA) problem Lowest Common Ancestor explanation video: https://youtu.be/sD1IoalFomA Sparse Table Video: https://www.youtube.com/watch?v=uUatD9AudXo Source code repository: https://github.com/williamfiset/algorithms#tree-algori
From playlist Tree Algorithms
Lowest Common Ancestor (LCA) Problem | Eulerian path method
Lowest Common Ancestor problem Lowest Common Ancestor source code video: https://www.youtube.com/watch?v=rA7JJG7x9vs Sparse Table Video: https://www.youtube.com/watch?v=uUatD9AudXo Source code repository: https://github.com/williamfiset/algorithms#tree-algorithms Video slides: https://
From playlist Tree Algorithms
The Last Universal Common Ancestor ft. Times Infinity
What was the Last Universal Common Ancestor If we trace back our ancestor its quickly revealed at some point the number of ancestors starts to exceed the population of earth at the time, eventually you can trace everything back to one organism, from which all currently alive things are de
From playlist Collaborations
Microsoft Coding Interview Question and Answer: Lowest Common Ancestor
*Just getting started with coding interviews? Check out my "Get Ready for Your Coding Interview" course on Lynda.com: https://www.lynda.com/Software-Development-tutorials/How-Ace-Developer-Interview/576698-2.html?lpk35=9181&utm_medium=ldc-partner&utm_source=CMPRC&utm_content=524&utm_campa
From playlist Coding Interview Questions and Answers
LINKS: http://www.Twitter.com/Tweetsauce http://www.Facebook./com/VsauceGaming Vsauce Tshirts: http://www.districtlines.com/vsauce music by: http://www.Soundcloud.com/JakeChudnow Bill Bryson's "A Short History of Nearly Everything": http://www.amazon.com/A-Short-History-Nearly-Everything
From playlist Human Behavior
This video provides an explanation on how to determine the LCM or least common multiple of two integers. http://www.mathispower4u.com
From playlist Factors, Prime Factors, and Least Common Factors
Leetcode Short [Rust | Vim] - Problem 235: Lowest Common Ancestor of a Binary Search Tree
I'm working my way through the "Grind 75" Leetcode problems, as a sort of warmup to Advent of Code coming in December 2022. Be amazed at my solutions! Poke holes in my logic! Come up with tests that break my code! These videos are all edited down from my twitch streams - come join me live
From playlist Leetcode
Leetcode Short [Rust | Vim] - Problem 236: Lowest Common Ancestor of a Binary Tree
I'm working my way through the "Grind 75" Leetcode problems. Be amazed at my solutions! Poke holes in my logic! Come up with tests that break my code! These videos are all edited down from my twitch streams - come join me for live rust programming if you can! https://www.twitch.tv/unclesc
From playlist Leetcode
Highest Common Factors and Lowest Common Multiples | HCF and LCM
Finding highest common factors (HCF) lowest cook multiples (LCM ) using prime factors and Venn diagrams!
From playlist Prime Numbers, HCF and LCM - GCSE 9-1 Maths
Lecture 7 - Suffix Arrays and Assembly
This is Lecture 7 of the CSE549 (Computational Biology) course taught by Professor Steven Skiena [http://www.cs.sunysb.edu/~skiena/] at Stony Brook University in 2010. The lecture slides are available at: http://www.algorithm.cs.sunysb.edu/computationalbiology/pdf/lecture7.pdf More infor
From playlist CSE549 - Computational Biology - 2010 SBU
Wolfram Physics Project: Working Session Wednesday, Apr. 29, 2020 [Finding Black Hole Structures]
Stephen Wolfram & Jonathan Gorard continue answering questions about the new Wolfram Physics Project, this time for a working session on finding structures of blackholes using the Wolfram Model. Begins at 1:36 Originally livestreamed at: https://twitch.tv/stephen_wolfram Stay up-to-date
From playlist Wolfram Physics Project Livestream Archive
The First Animal Ever on Earth
Do you ever wonder what the first animal on earth looked like? What did they do? How did they live? Join Stefan Chin for a fun new episode of SciShow that takes you way, way back. SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at https://www.scishowtangents.org
From playlist Biology
From one extreme to another: the statistics of extreme events - Jon Keating
One pleasure of mathematics is its capacity to connect seemingly unconnected problems, & to do it with just a few numbers & symbols. Mountain ranges, family trees, performance at the Olympic Games and Prime Numbers will all be joined by Jon Keating's mathematical thread in this Oxford Mat
From playlist Oxford Mathematics Public Lectures
Yellow River Civilization - The Secret Bone Oracles | Ancient Civilizations Uncovered | Documentary
Yellow River civilization is an ancient Chinese civilization that prospered in the middle and lower basin of the Yellow River. Agriculture was started in the flood plain of the Yellow River, and before long, through flood control and the irrigation of the Yellow River, cities were develope
From playlist Civilization