SQL Interview Questions
1.) Explain order of execution of SQL.2.) What is difference between where and having?3.) What is the use of group by?4.) Explain all types of joins in SQL?5.) What are…
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. š¹ 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…
Code Interview Checklist
ā Ask for clarifications on user input, constaintsā¦.etc ā Discuss multiple approaches and trade-offs (i.e discussed a brute force solution and its time complexity as well as an improvement and the new…
Tree Graph DSA QA
āø» Tree Answers Basic Questions 1. What is the difference between a binary tree and a binary search tree (BST)? ā¢ 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
š 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,…
DSA Advanced Optimization Techniques
Optimization TechniqueUsed ForTime Complexity ImprovementSpace Complexity ImprovementExplanationSpace Optimization (In-Place Computation)Modify array in-place (e.g., Remove Duplicates)No changeO(N) ā O(1)Modifies input data without extra space to save memory. Used in in-place sorting,…