- DSA Problems
Invert Binary Tree Algorithm Solution
Complete Java implementation for inverting a binary tree with recursive and iterative approaches, including time complexity analysis and edge case handling.
- DSA Problems
Implement Stack using Queues
Learn to implement a LIFO stack data structure using two queues with efficient push and pop operations.
- DSA Problems
Implement Queue using Stacks - Complete Java Solution
Learn to implement a queue data structure using two stacks with O(1) amortized time complexity for enqueue and dequeue operations.
- DSA Problems
Binary Tree Level Order Traversal Algorithm
Complete Java solution for binary tree level order traversal with BFS approach and time complexity analysis.
- DSA Problems
Valid Parentheses Algorithm Solution
Complete Java implementation for validating balanced parentheses using stack data structure with O(n) time and space complexity.
- DSA Problems
Basic Calculator Implementation and Evaluation
Complete Java solution for basic calculator with stack-based evaluation, handling parentheses and operator precedence.
- DSA Problems
Largest Rectangle in Histogram Algorithm Solution
Complete Java implementation for finding the largest rectangular area in a histogram with optimal time and space complexity analysis.
- DSA Problems
Car Fleet Problem Solution | Java Implementation for Traffic Flow Analysis
Complete Java solution for the Car Fleet problem analyzing traffic flow with stack-based approach and time complexity analysis.
- DSA Problems
Daily Temperatures Problem Solution
Complete Java implementation for daily temperatures problem with stack-based approach and optimal time complexity analysis.
- DSA Problems
Evaluate Reverse Polish Notation with Stack Data Structure
Learn to evaluate Reverse Polish Notation expressions using a stack-based approach in Java with O(n) time and space complexity.
- DSA Problems
Design a Min Stack with O(1) Time Complexity
Learn to implement a min stack that supports push, pop, and getMin operations in constant time using auxiliary stack technique.
- DSA Problems
Merge K Sorted Lists Algorithm Solution
Complete Java implementation of merging k sorted linked lists with optimal time and space complexity analysis for FAANG interviews.
FAANG Data Structures & Algorithms Problems Guide
A curated catalog of concrete data structures and algorithms problems. Use it to plan practice, track coverage, and rehearse solutions with a repeatable approach.