Category: Coding Interview
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Stack vs Recursion for Tree Traversal: 3 Real Reasons
Compare stack vs recursion for tree traversal with 3 performance insights. Which method wins for memory efficiency and speed? Find out here.
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HashMap vs Set: Dict Lookups Beat In-Memory Search by 47x
Dict lookups beat list search by 47x in this 100k-element test. But tiny datasets flip the winner — see the break-even point with benchmarks.
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Why Memorizing LeetCode Patterns Won’t Land You the Job
Memorizing LeetCode patterns isn't enough—learn why problem-solving skills and adaptability matter more for landing your dream coding job.
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Segment Tree Off-by-One: 5 Bugs That Break Range Queries
Fix the 5 off-by-one bugs that silently break segment trees — child indexing, range splits, lazy propagation. Includes runnable code + failing test cases.
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Python Sorting Benchmarks: Which Algorithm Wins?
Compare Python sorting algorithms with real benchmarks. The winner might surprise you — discover which method dominates speed tests across different data sizes.
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Heap & Stack Patterns: 8 Interview Problems Solved
Solve 8 heap and monotonic stack problems with O(n log k) patterns. Recognize when to use each structure before writing a single line of code.
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15 Coding Interview Patterns: Complete Python Reference
Master 15 coding patterns from Two Pointers to Monotonic Stack. Includes Python code, O(n) complexity proofs, and how to spot each pattern.
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Topological Sort: From Task Scheduling to Build Systems
Topological sort powers build systems and package managers. Kahn's vs DFS algorithms compared with real dependency graphs and failure modes.