The philosophy is simple: most coding problems share an underlying logic. If you understand the pattern, you can solve dozens of related problems without having seen them before. Instead of learning how to solve a problem , you learn how to identify the strategy . The 15 Essential Coding Patterns
Read the description of the pattern first. What are the "triggers" (e.g., if the problem mentions a sorted array, think Two Pointers or Binary Search ). grokking+the+coding+interview+github+pdf+full
Handling combinations and permutations using Breadth-First Search. The philosophy is simple: most coding problems share