Write a method to find the zig zag tree traversal in a tree. I got asked this question once in an interview. Now I found a few solutions to this…

How to generate all permutations of an array or string? This is quite the popular question in interviews… In fact, I personally got asked to generate all permutations of an…

The question we are going to take a look at today is how to remove duplicates from a LinkedList. We’re going to be using PHP for the coding part, just…

Hello again everyone. It has been quite a while since I last wrote something. Well work and life have been busy lately. Therefore I have not had much time for…

Hello again everyone! Been sometime since I wrote here. Today I wanted to take a peek at a simple Linked List problem – Swap Node Pairs. Took me a bout…

I was asked to write a simple merge-sort implementation as the initial warm-up part of an interview. (Meaning knowing how to implement merge-sort is a must-have requirement rather than an…

Today we are going to be visiting a very simple problem, which need some basic maths though. Given an integer, reverse it and return the reversed integer. Sample runs are:…

Today’s question is going to be a quick one. We want to find longest path in tree. What does Path mean in a Tree context? The Tree wikipedia page and…

Today we will take a look at a problem I personally got asked in an interview! It is called “Print all sets of factors”. Basically, we will try to write…

After my last DP problem, I thought I would try another one. In this problem we are asked to find the longest common subsequence of chars between two words. I…