Coding Interview
Understanding Prefix and Suffix Patterns
Jason Yang · 28 Nov, 2025
Prefix Sum and Suffix Product explained: what these algorithm terms really mean, why they beat naive recomputation, and where they show up in problems.
Blog posts — page 23
Coding Interview
217. Contains Duplicate
Jason Yang · 27 Nov, 2025
Contains Duplicate (LeetCode 217): compare the brute-force, sorting, and hash-set approaches — and why 'just use a hash set' isn't always the right reflex.
Programming Language
Understanding Java Exception Hierarchy
Jason Yang · 27 Nov, 2025
Understand Java's Throwable hierarchy — Error vs Exception, checked vs unchecked, and RuntimeException — to write safer error handling in production apps.
Coding Interview
Understanding One-Pass Algorithms and Greedy Strategies
Jason Yang · 27 Nov, 2025
One-pass and greedy algorithms: how a single scan and greedy choices process large data with minimal memory — the core ideas and when they're optimal.
Coding Interview
121. Best Time to Buy and Sell Stock
Jason Yang · 26 Nov, 2025
Best Time to Buy and Sell Stock (LeetCode 121): the single-pass O(n) solution that tracks the lowest price so far, with an interactive step-by-step visual.