java-dsa-series/

📘 DSA Practice Questions (Last 20 Days)

Find the First and Last Position of an Element in a Sorted Array

Minimum Size Subarray Sum

Longest Subarray with Sum ≤ K

Group Anagrams

Longest Consecutive Sequence

Top K Frequent Elements

Find the Second Largest Element in an Array

Maximum Sum of a Continuous Subarray (Kadane’s Algorithm)

Binary Tree Level Order Traversal

Valid Parentheses (using Stack)

Check if an Array is Sorted and Rotated

Count Occurrences of an Element in a Sorted Array (Binary Search)

Majority Element (Boyer–Moore Voting Algorithm)

Find a Peak Element (Binary Search)

Longest Substring Without Repeating Characters

Find the Single Non-Repeating Element in a Sorted Array (Binary Search)

Find the Single Non-Repeating Element using XOR

Find the Missing Number in an Array (Using XOR)

Check if a Number is a Power of Two (Bit Manipulation)

Design a Custom Priority Task Queue using OOP Concepts in Java