Union‑Find Explained: Solving the 'Number of Provinces' Problem
Solve Number of Provinces with union‑find in TypeScript, comparing DFS, connected components, path compression, union by rank, and matrix scanning.
Articles
LeetCode
LeetCode is a useful prompt for practising algorithmic judgement, but a finished answer is not much use without the route to it. My walkthroughs concentrate on recognising the pattern, rejecting the tempting brute‑force approach, and explaining the solution in JavaScript or TypeScript.
Union‑Find Explained: Solving the 'Number of Provinces' Problem. 
Solving the LeetCode N‑Queens Problem. Solving the LeetCode N‑Queens Problem
Solve the N‑Queens problem with TypeScript backtracking, including the decision tree, constraints, complexity, and test cases.
LeetCode: The 'Kth Smallest Element in a BST' Problem. LeetCode: The 'Kth Smallest Element in a BST' Problem
Solve Kth Smallest Element in a BST with in‑order traversal, showing why the tree's ordering removes the need for a separate sorting step in interviews.
Backtracking Decision Trees: Solving 'Combination Sum'. Backtracking Decision Trees: Solving 'Combination Sum'
Solve Combination Sum with backtracking in TypeScript, using a growing path, remaining total, sorted pruning, reuse rules, and common mistakes too.
Solving the 'Jump Game' Problem with Greedy Algorithms. Solving the 'Jump Game' Problem with Greedy Algorithms
A clear walkthrough of LeetCode Jump Game using a greedy algorithm, including why the farthest‑reach approach works and where slower ideas get stuck.
Dynamic Programming in LeetCode: Solving 'Coin Change'. Dynamic Programming in LeetCode: Solving 'Coin Change'
How to solve LeetCode Coin Change with dynamic programming, and why the obvious greedy approach fails on exactly the cases worth understanding in interviews.
LeetCode: Finding the Diameter of a Binary Tree. LeetCode: Finding the Diameter of a Binary Tree
The diameter of a binary tree is the longest path between any two nodes. I'll explain clearly how we can solve this problem using recursion in JavaScript.
Topological Sort: Solving the 'Course Schedule' Problem. Topological Sort: Solving the 'Course Schedule' Problem
How to solve Course Schedule with topological sort in TypeScript, comparing Kahn's algorithm with DFS cycle detection and why in‑degrees read clearly.
Multi‑Source BFS: Solving the 'Rotting Oranges' Problem. Multi‑Source BFS: Solving the 'Rotting Oranges' Problem
Solve Rotting Oranges with multi‑source BFS in TypeScript, treating each queue level as one minute and tracking fresh cells until spread completes.
Quickselect in TypeScript: Solving 'Kth Largest Element in an Array'. Quickselect in TypeScript: Solving 'Kth Largest Element in an Array'
Solve Kth Largest Element in an Array with Quickselect in TypeScript, comparing sorting, heaps, partitioning, random pivots, and trade‑offs under pressure.
Find Peak Element: Binary Search Without a Fully Sorted Array. Find Peak Element: Binary Search Without a Fully Sorted Array
How to solve LeetCode Find Peak Element with binary search, and why local comparisons are enough even when the array is not sorted in the usual way.
Graph Traversal: Solving the 'Course Schedule' Problem. Graph Traversal: Solving the 'Course Schedule' Problem
The 'Course Schedule' problem tests our ability to detect cycles using graph traversal. I'll explain a clear solution using depth‑first search with TypeScript.
Modified Binary Search: Solving 'Search in Rotated Sorted Array'. Modified Binary Search: Solving 'Search in Rotated Sorted Array'
How to solve Search in Rotated Sorted Array with modified binary search, identifying the sorted half each step and narrowing safely in TypeScript.
LeetCode: Solving the 'Merge Two Sorted Lists' Problem. LeetCode: Solving the 'Merge Two Sorted Lists' Problem
The 'Merge Two Sorted Lists' problem on LeetCode involves combining two sorted linked lists into one. Here, I explore a clear solution with TypeScript examples.
Binary Search on the Answer: Solving 'Koko Eating Bananas'. Binary Search on the Answer: Solving 'Koko Eating Bananas'
Solve Koko Eating Bananas with binary search on the answer, using feasibility checks, speed bounds, ceiling division, TypeScript examples, and edge cases.
Monotonic Stack: Solving the 'Daily Temperatures' Problem. Monotonic Stack: Solving the 'Daily Temperatures' Problem
Solve Daily Temperatures with a monotonic stack in TypeScript, storing indices to find the next warmer day without repeated scanning and common mistakes.
Generate Parentheses in TypeScript: A Clean Backtracking Walkthrough. Generate Parentheses in TypeScript: A Clean Backtracking Walkthrough
Generate valid parentheses in TypeScript with backtracking, recursion state, pruning, edge cases, and why the approach avoids invalid strings in code.
Implementing a Trie in TypeScript: Solving 'Implement Trie (Prefix Tree)'. Implementing a Trie in TypeScript: Solving 'Implement Trie (Prefix Tree)'
Implement a Trie prefix tree in TypeScript with Map‑based nodes, insert, search, startsWith, shared prefixes, complexity, and alternative child storage.