System Design Interview Vocabulary Notes
In this post, we will see some of the frequently used concepts/vocabulary in System Design interviews preparations. Node This is very basic…
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Coding Interview - Facebook System Design Interview Types
System design interview is pretty common these days, specially if you are having experience of more than 4-5 years. It is infact a good way…
Find the maximum sum of any continuous subarray of size K
Introduction You are given an array of integers with size N, and a number K. Find the maximum sum of continuous subarray of size K. Example…
Graph Topological Sorting - Build System Order Example
Graph Topological Sorting This is a well known problem in graph world. Topological sort is to put vertices in order and output a list of…
Binary Tree - Level Order Traversal
Problem Statement Given a Binary tree, print out nodes in level order traversal from left to right. Approach-1 Use BFS (Breadth First Search…
Four Sum - Leet Code Solution
Problem Statement Given an array nums of n integers and an integer target, are there elements a, b, c, and d in nums such that a + b + c + d…
Leetcode - Rearrange Spaces Between Words
Problem Statement You are given a string text of words that are placed among some number of spaces. Each word consists of one or more…
Leetcode - Maximum Non Negative Product in a Matrix
Problem Statement You are given a rows x cols matrix grid. Initially, you are located at the top-left corner (0, 0), and in each step, you…
Leetcode - Split a String Into the Max Number of Unique Substrings
Problem Statement Given a string s, return the maximum number of unique substrings that the given string can be split into. You can split…
Crawler Log Folder - minimum number of operations needed to go back to the main folder after the change folder operations.
Problem The Leetcode file system keeps a log each time some user performs a change folder operation. The operations are described below…
Replace all spaces in a string with %20
Problem Statement Replace all spaces in a string with ‘%20’ (three characters). Do this in place and assume you have enough space in array…
Determine if a string has all unique characters
Problem Implement an algorithm to determine if a string has all the characters as unique. Lets try to understand the problem first. Always…
Valid Palindrome - Leet Code Solution
Problem Statement Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. Note: For…
Valid Anagrams - Leet Code Solution
Problem Statement Given two strings s and t , write a function to determine if t is an anagram of s. Example Note: You may assume the…
First Unique Character in a String - Leet Code Solution
Problem Statement Given a string, find the first non-repeating character in it and return its index. If it doesn’t exist, return -1. Example…
Reverse String - Leet Code Solution
Problem Statement Write a function that reverses a string. The input string is given as an array of characters char[]. Do not allocate extra…
Rotate Image - Leet Code Solution
Problem Statement You are given an n x n 2D matrix representing an image, rotate the image by 90 degrees (clockwise). You have to rotate the…
Validate Sudoku - Leet Code Solution
Problem Statement Determine if a 9x9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules…
Move Zeroes - Leet Code Solution
Problem Statement Given an array nums, write a function to move all 0’s to the end of it while maintaining the relative order of the non…
Plus One - Leet Code Solution
Problem Statement Given a non-empty array of digits representing a non-negative integer, increment one to the integer. The digits are stored…
Intersection of Two Arrays-II - Leet Code Solution
Problem Statement Given two arrays, write a function to compute their intersection. Example Note: Each element in the result should…
Find if Array contains Duplicate Number - Leet Code Solution
Problem Statement Given an array of integers, find if the array contains any duplicates. Your function should return true if any value…
Single Number - Leet Code Solution
Problem Statement Given a non-empty array of integers, every element appears twice except for one. Find that single one. Example Solution…
Maximum Length of Subarray With Positive Product - Leet Code Solution
Problem Statement Maximum Length of Subarray With Positive Product. Given an array of integers nums, find the maximum length of a subarray…
Rotate Array - Leet Code Solution
Problem Statement Given an array, rotate the array to the right by k steps, where k is non-negative. Example Solution (Simple) Its like…
Calculate Max Profit - Buy and Sell Stocks Multiple Times - Leet Code Solution
Problem Statement Say you have an array prices for which the ith element is the price of a given stock on day i. Design an algorithm to find…
Remove Duplicates from Sorted Array - Leet Code Solution
Problem Statement Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new…
How to automate create Function App with Blob Trigger and Sendgrid Notification through Azure Arm Template and deploy
In previous post (Trigger Email on Blob Trigger), we saw how we can create such automation pipeline to get email notification every time…
Binary Search Tree (BST) Data Structure
A Binary Search tree (BST) is a data structure which has two children nodes attached to it, called left and right node. There is a special…
Binary Tree Data Structure
A Binary tree is a data structure which has two children nodes attached to it, called left and right node. Do remember, its different from a…
How to calculate First Common Ancestor of two Nodes in Binary Tree
First try to understand question. Its a binary tree, not a binary search tree Find first common ancestor There is no link to parent nodes…
Drupal 8 - How to Theme Form and its Fields with reordering fields
Introduction In this post, we will see how to theme form and its fields. Assumming we are having a content type: , and it is having…
Azure Functions - How to trigger an email on any change in storage container blob
Introduction In Azure, assuming you are having a storage container. And, you want to get an alert email if there are anything changes in…