30 articles

📰 Dev.to · Nithya Dharshini official

Articles from Dev.to · Nithya Dharshini official · 30 articles · Updated every 3 hours · View all reads

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Cracking "Duplicate Zeros" with 0ms Runtime
Dev.to · Nithya Dharshini official 1w ago
Cracking "Duplicate Zeros" with 0ms Runtime
Just hit that 0ms (100th percentile) milestone on LeetCode! Here is a quick breakdown of how to solve...
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Partition Labels – Greedy + Two Pointer Thinking
Dev.to · Nithya Dharshini official 2w ago
Partition Labels – Greedy + Two Pointer Thinking
This problem looks confusing at first… “Split the string so each character appears in only one...
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Two Sum IV – Input is a BST (Two Pointer Approach)
Dev.to · Nithya Dharshini official 3w ago
Two Sum IV – Input is a BST (Two Pointer Approach)
We already know the classic Two Sum problem on arrays. But what if the data is inside a Binary...
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Remove Duplicates from Sorted Array II (LeetCode 80) — Simple Explanation
Dev.to · Nithya Dharshini official 3w ago
Remove Duplicates from Sorted Array II (LeetCode 80) — Simple Explanation
This problem is a great extension of the basic two-pointer technique. Problem...
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Understanding Prefix Sum with a Practical Example (Pocket Money Tracker)
Dev.to · Nithya Dharshini official 1mo ago
Understanding Prefix Sum with a Practical Example (Pocket Money Tracker)
Prefix Sum is a simple but powerful technique used in many array problems instead of recalculating...
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Battery Optimization Mode – A Custom Sliding Window Problem(Real World Example)
Dev.to · Nithya Dharshini official 1mo ago
Battery Optimization Mode – A Custom Sliding Window Problem(Real World Example)
Problem Smart glasses run heavy processing tasks like real-time navigation or object...
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Sliding Window on a Circular Array — Defuse the Bomb (LeetCode 1652)
Dev.to · Nithya Dharshini official 1mo ago
Sliding Window on a Circular Array — Defuse the Bomb (LeetCode 1652)
Today I solved an interesting Sliding Window problem on a circular array.This problem helped me...
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Understanding Happy Number (LeetCode 202) – HashSet + Cycle Detection
Dev.to · Nithya Dharshini official 1mo ago
Understanding Happy Number (LeetCode 202) – HashSet + Cycle Detection
Today I solved a classic problem that looks simple but teaches an important concept: cycle detection...
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From Prefix Array to Clean Variables – LeetCode 1732 (Find the Highest Altitude)
Dev.to · Nithya Dharshini official 1mo ago
From Prefix Array to Clean Variables – LeetCode 1732 (Find the Highest Altitude)
Today I solved a simple but important prefix-sum type problem. Problem Summary A biker starts at...
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Mastering Fixed Sliding Window in C++ (LeetCode 1876)
Dev.to · Nithya Dharshini official 1mo ago
Mastering Fixed Sliding Window in C++ (LeetCode 1876)
Today I solved a beautiful Sliding Window problem that perfectly demonstrates how fixed-size...
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Sliding Window in Action — Solving “Grumpy Bookstore Owner” Step by Step
Dev.to · Nithya Dharshini official 1mo ago
Sliding Window in Action — Solving “Grumpy Bookstore Owner” Step by Step
Sliding Window makes sense only when you see it working in a real problem. This problem is a great...
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Squares of a Sorted Array — Understanding the Two Pointer Trick
Dev.to · Nithya Dharshini official 2mo ago
Squares of a Sorted Array — Understanding the Two Pointer Trick
This problem looks simple at first, but it hides a classic two-pointer pattern. Let’s break it...
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Sliding Window in Arrays — A Beginner’s Mental Model
Dev.to · Nithya Dharshini official 2mo ago
Sliding Window in Arrays — A Beginner’s Mental Model
When I first heard Sliding Window, my confusion was: Why not recalculate every time? Which element...
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Intersection of Two Linked Lists — My First Working Approach
Dev.to · Nithya Dharshini official 2mo ago
Intersection of Two Linked Lists — My First Working Approach
When I first solved LeetCode 160: Intersection of Two Linked Lists, I focused on understanding what...
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Move Zeroes — Understanding the Read & Write Pointer Pattern (C++)
Dev.to · Nithya Dharshini official 2mo ago
Move Zeroes — Understanding the Read & Write Pointer Pattern (C++)
When I first solved “Move Zeroes”, I didn’t struggle with the code — I struggled with understanding...
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Finding the Second Largest Element — From Data Structures to Optimal Thinking
Dev.to · Nithya Dharshini official 2mo ago
Finding the Second Largest Element — From Data Structures to Optimal Thinking
This problem looks simple, but it quietly tests pattern selection. Here’s how I approached it — and...
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Finding the Missing Number — What I Tried vs What I Learned About Optimal Patterns
Dev.to · Nithya Dharshini official 2mo ago
Finding the Missing Number — What I Tried vs What I Learned About Optimal Patterns
When solving the Missing Number problem, I didn’t jump to the optimal solution immediately. Instead,...
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Contains Duplicate II
Dev.to · Nithya Dharshini official 2mo ago
Contains Duplicate II
From Brute Force to Index-Based Frequency Thinking At first glance, Contains Duplicate II...
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Two Sum II (Sorted Array) — My First Clean Two Pointer Win
Dev.to · Nithya Dharshini official 2mo ago
Two Sum II (Sorted Array) — My First Clean Two Pointer Win
After struggling with pointer movement logic in earlier problems, Two Sum II finally felt…...
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Reverse Vowels of a String — What I Missed, What I Learned (Two Pointer Reflection)
Dev.to · Nithya Dharshini official 2mo ago
Reverse Vowels of a String — What I Missed, What I Learned (Two Pointer Reflection)
When learning the Two Pointer technique, some problems don’t fail completely — they fail...
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Container With Most Water — Beginner Two Pointer Breakdown (That “Ohhh” Moment)
Dev.to · Nithya Dharshini official 2mo ago
Container With Most Water — Beginner Two Pointer Breakdown (That “Ohhh” Moment)
When I first saw Container With Most Water, I froze. The problem looked simple. The brute force was...
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Two Pointer for Beginners — Reverse an Array (In-Place)
Dev.to · Nithya Dharshini official 2mo ago
Two Pointer for Beginners — Reverse an Array (In-Place)
When starting with the Two Pointer technique, one of the simplest and most important problems is...
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From Frequency Count to Two Pointer Technique: Level Up Your Array Skills 🚀
Dev.to · Nithya Dharshini official 2mo ago
From Frequency Count to Two Pointer Technique: Level Up Your Array Skills 🚀
We are familiar with frequency counting — counting elements in arrays or strings using hash maps or...
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Sorting Elements by Frequency in C++ (Map vs Bucket Approach)
Dev.to · Nithya Dharshini official 2mo ago
Sorting Elements by Frequency in C++ (Map vs Bucket Approach)
🧠 Problem Idea Given an array, sort elements by descending frequency and rebuild the array so...
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