DSA Java methods
Arrays:int[] arr = new int[size];int[] numbers = {1, 2, 3, 4, 5};int[][] matrix = {{1, 2, 3},{4, 5, 6},{7, 8, 9}};for( int num : nums).length Strings:.toCharArray() Hashmap: Map<Character, Integer> count…
Arrays
Must-Know Array DSA Topics with Time & Space Complexity Below is a comprehensive list of must-know Array DSA topics, including time & space complexity for common operations. 
Basic Array…
FencePost & Semi-Open Intervals
Let me explain fencepost errors and semi-open intervals in a clear and detailed manner: 1. Fencepost Error A fencepost error occurs in programming when an algorithm includes one extra or…
DSA Coding Interview Concepts
Arrays:Binary search,Sorting,sliding window,2 pointer, prefix sum, stacks,Greedy,DPQuestions:704. Binary Search (E)74. Search a 2D Matrix(M)153. Finding Minimum in a sorted array(M)33. search in a rotated array(M)4. Median of two sorted arrays…
Tree Graph DSA QA
⸻ Tree Answers Basic Questions 1. What is the difference between a binary tree and a binary search tree (BST)? • A binary tree is a tree where each node…
NeetCode 150
CategoryPatterns# QuestionsEasyMediumHardComplexity (Avg Case)ArraysSliding Window, Two Pointers, Prefix Sum18594O(N) - O(N log N)StringsHashing, Two Pointers, Sliding Window14473O(N)Linked ListFast & Slow Pointers, Recursion10352O(N)Stacks & QueuesMonotonic Stack, LRU Cache12273O(N)Binary SearchSearch Space Reduction,…
NeetCode 150 – Study Roadmap
NeetCode 150 - Priority-Based Study Roadmap This roadmap is structured priority-wise, optimizing for FAANG interviews. It assumes 2-3 hours of practice per day and categorizes topics into high-priority, mid-priority,…