Interview

If you want to practice data structure and algorithm programs, you can go through 100+ java coding interview questions. In this post , we will see how to implement Queue using Linked List in java. Queue is abstract data type which demonstrates First in first out (FIFO) behaviour. We will implement same behaviour using Array. Although java provides implementation […]

Counting sort is special sorting technique used to sort elements between specific range. Lets say elements belong to range 1 to K , then Counting sort can be used to sort elements in O(N) times. Basic idea of counting sort to find number of elements less than X, so X can be put to its […]

In this post, we will see how to implement heap sort in java. I will divide heap sort in multiple parts to make it more understandable. What is heap? A heap is a tree with some special properties, so value of node should be greater than or equal to(less than or equal to in case […]

If you want to practice data structure and algorithm programs, you can go through 100+ java coding interview questions. In this post , we will see how to convert sorted LinkedList to balanced binary search tree. There are two ways to do it. Solution 1: It is very much similar to convert sorted array to BST. […]

If you want to practice data structure and algorithm programs, you can go through 100+ java coding interview questions. In this post ,  we will see how to convert sorted array to balanced binary search tree. Algorithm: You might know that inorder traversal of binary search tree results in sorted array. We will use this property […]

Problem : Given an array of positive integer and given value X, find Contiguous sub array whose sum is equal to X. For example: [crayon-6768e2c06f7ca081457314/] Solution: Solution 1: Check all sub arrays and if current sum is equal to X, return. This will require two loops and if currentSum is greater than X tben try […]

Problem : Given an array of 0’s and 1’s in random order , you need to separate 0’s and 1’s in an array. For example: [crayon-6768e2c06f972825519021/] Solution : Solution 1: Count number of 0’s in the array. Lets say we get X 0’s Once we get the count, put X 0’s in the array and […]

If you want to practice data structure and algorithm programs, you can go through data structure and algorithm interview questions. In this post, we will see how to find minimum element in sorted and rotated array. Problem: You are given an sorted and rotated array as below: [crayon-6768e2c06fbad247096045/] If you note that array is sorted and […]

If you want to practice data structure and algorithm programs, you can go through 100+ java coding interview questions. Given array of integers, find Maximum difference between two elements such that larger element appears after the smaller number For example: [crayon-6768e2c06fd09326271669/] Algorithm: Lets say we have array arr[] of stock prices. We will track two variable :minElementTillNow and maxDifference. minElementTillNow will be […]