• Rotate matrix by 90 degrees in java
    20 May

    Rotate Matrix by 90 degrees in java

    In this article, we will look into another interesting problem related to 2D Arrays. Given a Matrix of N X N Dimension we have to Rotate matrix by 90 degrees. We will perform Rotation both Clockwise i.e. Right Rotation and Anti-Clockwise i.e. Left Rotation respectively. We will discuss each operation in detail along with a […]

  • Data structures in java
    16 April

    Data Structures in java

    In this post, we will see about various data structures in java. Data structure is a way of storing and organizing data. Data structure provide a way to process and store data efficiently. For example: Imagine you have pile of books on the table and you are going to read these books one by one […]

  • 29 November

    Top 100+ Java coding interview questions

    I have been posting data structure and coding interview questions on various topics such as Array, Queue, Stack, Binary tree, LinkedList, String, Number, ArrayList, etc. So I am consolidating a list of java coding interview questions to create an index post. I will keep adding links to this post whenever I will add new java […]

  • 18 April

    Minimum Number of Jumps to reach last Index

    If you want to practice data structure and algorithm programs, you can go through Java coding interview questions. In this post, we will see how to find Minimum Number of Jumps to reach last Index. Problem Given an array A of positive integers possibly zeroes, every index indicating the maximum length of a jump that can […]

  • 20 February

    Inorder Successor in a Binary Search Tree

    If you want to practice data structure and algorithm programs, you can go through Java coding interview questions. In this post, we will see how to find Inorder Successor in a Binary Search Tree. Problem Given a Binary Search Tree and a target node value. Find the Inorder successor of the given node value in the […]

  • 04 February

    LCA of a K-ary Tree in O(Sqrt(height))

    If you want to practice data structure and algorithm programs, you can go through Java coding interview questions. In this post, we will see about how to find Lowest Common Ancestor of a K-ary Tree in O(Sqrt(height)).We have already seen how to find LCA of n-ary tree in O(n) complexity. Problem Given a K-ary tree and […]

  • 03 February

    Largest Rectangular Area in a Histogram

    If you want to practice data structure and algorithm programs, you can go through Java coding interview questions. In this post, we will see about how to find largest rectangular area in a Histogram. Problem Given an Integer representing number of bars in a Histogram and an array of integers representing the height of the bars […]

  • 29 January

    Count subtrees with Sum equal to target in binary tree

    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 about how to count subtrees with Sum equal to target in binary tree Problem Given a Binary tree and an integer. You need to find the number of subtrees having the […]

  • 20 November

    Serialize and Deserialize n-ary tree

    If you want to practice data structure and algorithm programs, you can go through Java coding interview questions. Problem Given a Generic Tree, Serialize and Deserialize it. Serialization is a basically a representation of a tree in a String format which takes much lesser space than storing the tree itself. Deserialization is constructing the actual tree […]