Teaching Kids Programming – Four Algorithms to Validate a Binary Search Tree

Teaching Kids ProgrammingVideos on Data Structures and Algorithms Given a binary tree root, return whether it’s a binary search tree. A binary tree node is a binary search tree if : All nodes on its left subtree are smaller than node.valAll nodes on its right subtree are bigger than node.valAll nodes hold the properties.Constraintn ≤ … Read more

Teaching Kids Programming – Algorithms to Find the Lowest Common Ancestor of a Binary Search Tree

Teaching Kids ProgrammingVideos on Data Structures and Algorithms Given a binary search tree (BST), find the lowest common ancestor (LCA) node of two given nodes in the BST. According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes p and q as the lowest node in T that … Read more

android – Recursive synthetic property accessor, Can’t get the size of list in PagingDataAdapter casue java.lang.StackOverflowError

In this app, I tried to use Paging3, Retrofit, and RXJava to get a list of popular movies, this is the link of API, the problem is in MoviesDataAdapter class when I didn’t override getItemCount fun the recyclerView didn’t show anything but the result showing in Log when I return item count, the AS shows … Read more

Teaching Kids Programming – Left/Right Side View of a Binary Tree using Depth/Breadth First Search Algorithms

Teaching Kids Programming: Videos on Data Structures and Algorithms Given the root of a binary tree, imagine yourself standing on the left/right side of it, return the values ​​of the nodes you can see ordered from top to bottom. Given the following Binary Tree, the left side view will be [6, 3, 6] while the … Read more