Validate Binary Search Tree
Link to leetcode problem definition Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as…
Java - how to transform Array to linked list
A simple demo of creating linked list from array
Java - sort two dimensional array with Stream API
Use stream api to quickly sort a 2D array in Java.
Java - how to transform HashSet to ArrayList
The below code snippet demonstrates how to transform a set collection to list. Simply pass a set in constructor of List:
35. Search Insert Position - June day 10
Link to leetcode problem definition Given a sorted array and a target value, return the index if the target is found. If not, return the…
226. Invert Binary Tree - June day 1
Inspiration of this problem comes from Max Howel's interview experience with Google described in this tweet. Lets jump to the problem The…
406. Queue Reconstruction by Height - June day 6
Link to leedcode problem definition Suppose you have a random list of people standing in a queue. Each person is described by a pair of…
344. Reverse String - June day 4
link to leedcode problem definition Write a function that reverses a string. The input string is given as an array of characters char[]. Do…