Fast and Slow Pointers: Solving the 'Linked List Cycle' Problem
Solve Linked List Cycle with fast and slow pointers in TypeScript, comparing visited‑node storage with Floyd's cycle detection and common mistakes.
Articles
Algorithms, page 2 of 3
Algorithms are the repeatable problem‑solving patterns we use when brute force is no longer good enough. In web development they show up far beyond interview preparation, wherever the order or cost of work matters. A lot of the articles here overlap with LeetCode, but the category is broader than that; it is about recognising the techniques that make difficult problems easier to reason about in JavaScript and TypeScript.
Fast and Slow Pointers: Solving the 'Linked List Cycle' Problem. 
Grid Traversal: Solving the 'Number of Islands' Problem. Grid Traversal: Solving the 'Number of Islands' Problem
How to solve Number of Islands with grid traversal, treating the matrix like a graph, marking visited land safely, and reasoning about DFS in TypeScript.
Sliding Window Fundamentals: Solving 'Longest Substring Without Repeating Characters'. Sliding Window Fundamentals: Solving 'Longest Substring Without Repeating Characters'
How to solve Longest Substring Without Repeating Characters with sliding window basics, comparing Set and last‑seen‑index approaches in TypeScript.
LeetCode: The 'Trapping Rain Water' Problem with Two‑Pointer Approach. LeetCode: The 'Trapping Rain Water' Problem with Two‑Pointer Approach
How to solve Trapping Rain Water with the two‑pointer approach, and the simple invariant that makes the O(n) solution click under interview pressure.
Intervals in Practice: Solving the 'Merge Intervals' Problem. Intervals in Practice: Solving the 'Merge Intervals' Problem
Solve Merge Intervals in TypeScript by sorting ranges, merging overlaps, handling touching intervals, preserving inputs, and avoiding common mistakes.
Prefix and Suffix Products: Solving 'Product of Array Except Self'. Prefix and Suffix Products: Solving 'Product of Array Except Self'
How to solve Product of Array Except Self without division, using prefix and suffix products to keep the logic linear and interview‑safe in TypeScript.
LeetCode: Removing the nth Node from the End of a List. LeetCode: Removing the
nthNode from the End of a ListHow to remove the Nth node from the end of a linked list in TypeScript. Here we break down and explore a simple double‑pass and an efficient single‑pass method.
The Palindrome Number Problem: Strings vs. Maths in JavaScript. The Palindrome Number Problem: Strings vs. Maths in JavaScript
Distinguishing two approaches to detect palindrome numbers: the intuitive string method vs. the optimised mathematical technique, highlighting their merits.
Finding the Median of Two Sorted Arrays with JavaScript. Finding the Median of Two Sorted Arrays with JavaScript
Find the median of two sorted arrays in JavaScript, from a simple merge approach to edge cases and the logarithmic approach interviewers often expect.
LeetCode: Converting Roman Numerals to Integers. LeetCode: Converting Roman Numerals to Integers
Convert Roman numerals to integers in JavaScript, covering subtractive notation, invalid input caveats, and a clear TypeScript implementation.
LeetCode: Converting Integers to Roman Numerals. LeetCode: Converting Integers to Roman Numerals
Convert integers to Roman numerals in JavaScript, covering symbol rules, greedy matching, edge cases, and a clear TypeScript implementation.
LeetCode Container with Most Water: The Two‑Pointer Solution. LeetCode Container with Most Water: The Two‑Pointer Solution
Solve Container With Most Water in TypeScript using the two‑pointer pattern, with pointer movement, complexity, edge cases, and testable logic explained.
Using JavaScript and the Two‑Pointer Technique to Solve 4Sum. Using JavaScript and the Two‑Pointer Technique to Solve 4Sum
Master the 4Sum problem in JavaScript: Explore the two‑pointer technique, solve with ES6/TypeScript, and test using Cypress. Elevate your coding skills.
3Sum Closest in JavaScript: Sorting and Two Pointers. 3Sum Closest in JavaScript: Sorting and Two Pointers
Solve 3Sum Closest in JavaScript with sorting and two pointers, reducing brute‑force work whilst finding the nearest total efficiently in TypeScript.
Add Two Numbers in TypeScript: A LeetCode Linked List Solution. Add Two Numbers in TypeScript: A LeetCode Linked List Solution
Solve LeetCode Add Two Numbers in TypeScript with linked‑list traversal, carry handling, edge cases, and a clear implementation you can test and extend.
3Sum in JavaScript: Two Pointers After Sorting. 3Sum in JavaScript: Two Pointers After Sorting
Solve the 3Sum problem in JavaScript with sorting, two pointers, duplicate skipping, Jest coverage, edge cases, and a clear TypeScript implementation.
Longest Substring Without Repeating Characters in JavaScript. Longest Substring Without Repeating Characters in JavaScript
Solve Longest Substring Without Repeating Characters in JavaScript with a sliding window, unique‑character tracking, and substring return variants.
Valid Palindrome in JavaScript: Two Pointers and Normalisation. Valid Palindrome in JavaScript: Two Pointers and Normalisation
A simple solution to solve the Valid Palindrome problem in JavaScript using the two‑pointer approach in ES6 and TypeScript, checking alphanumeric characters.