Check Sorted Array & Reverse Array in Java | Two Pointer Approach | Day 9 | 100 Days of DSA

Welcome to Day 9 of the 100 Days of DSA with Java series.

In this video, we will solve two important array-based problems in Java:

✅ Check if an array is sorted or not
✅ Reverse an array using the Two Pointer Approach

First, we will understand how to check whether an array is sorted using two approaches: a nested loop approach and an optimized single-loop approach.

Then, we will learn how to reverse an array using the popular Two Pointer Technique, where we swap the first and last elements and move both pointers toward the center.

In this video, we will cover:

✅ Check if array is sorted
✅ Nested loop approach
✅ Optimized single loop approach
✅ Reverse an array
✅ Two Pointer Technique
✅ Step-by-step dry run
✅ Java implementation
✅ Time complexity explanation
✅ Important array logic for placements

LeetCode note:

There is no exact direct LeetCode problem for “Check if array is sorted” or “Reverse an array” as a basic standalone array question.

Closest related LeetCode problems:

LeetCode 1752 – Check if Array Is Sorted and Rotated
LeetCode 344 – Reverse String
LeetCode 189 – Rotate Array

This video is part of the 100 Days of DSA with Java – Placement Preparation Series.

Subscribe and continue your DSA journey with Java.

#java #dsa #arrays #twopointers #javadsa #placementpreparation #codinginterview

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