The Lazy Singleton Design Pattern in Java
The Singleton design is one of the must-known design pattern if you prepare for your technical interviews (Big IT companies have design questions apart from coding questions). The Singleton …
The Recursive QuickSort Implementation in C++
Quicksort is the de-factor sorting algorithm that is widely used. Its average runtime complexity is O(nlogn) and it’s usually implemented in either recursion or iterative style. Quicksort can be …
How to Find out the Most Frequent Subtree Sum using Depth First Search Algorithm?
Given the root of a tree, you are asked to find the most frequent subtree sum. The subtree sum of a node is defined as the sum of all …
A Microsoft Coding Interview Screening for Position Principal Software Engineer
June 18, 2019
Engineering, interview questions, interviews, Microsoft, Software Engineering
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A while ago, I was applying a job (Principal Software Engineer) for Microsoft, in Cambridge the Microsoft Research Center. Principle Software Engineer level in Microsoft is a very decent, …
The Brace Expansion Algorithms using Breadth First Search or Depth First Search
A string S represents a list of words. Each letter in the word has 1 or more options. If there is one option, the letter is represented as is. …
Coding Exercise: Sum of Digits in the Minimum Number
Given an array A of positive integers, let S be the sum of the digits of the minimal element of A. Return 0 if S is odd, otherwise return …