LeetCode 22. Generate Parentheses Java Solution And Time Complexity Explanation

Generating all possible combinations of balanced parentheses is a common interview problem & is found in websites like LeetCode & GeeksForGeeks.Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. We are using backtracking to solve this problem. There are two cases where we can proceed to the next recursive … Read more

Java Program to Solve Median of Two Sorted Array Problem

We will solve Median of two sorted arrays problem here. It is a common problem solving question which is asked in interview rounds of companies like Amazon, Google, Microsoft & Goldman Sachs. We will use LeetCode problem “4. Median of Two Sorted Arrays” as example here. The problem states that: Given two sorted arrays nums1 … Read more

Java Program For Shortest Unique Prefix Problem

Shortest Unique Prefix is an interview question which you can find in websites like GeeksForGeeks & InterviewBit. It is asked in Google interviews. The problem is as follows: Find shortest unique prefix to represent each word in the list.Input: [zebra, dog, duck, dove]Unique Prefix of each word is as below:zebra = zdog = dogduck = … Read more

Better Explanation Of Order of People Heights Problem And Java Program To Solve It

We will be solving LeetCode problem “406. Queue Reconstruction by Height” here. The problem states that: You are given an array of people, “people“, which are the attributes of some people in a queue (not necessarily in order). Each people[i] = [hi, ki] represents the ith person of height hi with exactly ki other people in front who have a height greater than or … Read more

Java Program for Least Common Ancestor Of A Binary Tree

We will solve LeetCode problem “236. Lowest Common Ancestor of a Binary Tree” here. The problem states that: Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes p and q … Read more