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Problems
Basics first, then the classics, then company-style assessments. Every problem has tests you run right here; multi-level ones unlock as you go. See the roadmap.
Practical systems
Files & networks
Deduplicating files, resolving names.
6 problems
Practical systems
Files & networks Deduplicating files, resolving names.
File deduplication
- Basics: group paths by identical content basics easy
- Clean up notes synced from two laptops easy
- Find duplicate files (size, prefix, content) 3 levels Anthropic medium
DNS resolver
- Basics: follow a CNAME chain with loop detection basics easy
- Exact and wildcard records, most specific wins easy
- DNS resolution with CNAME cycles 5 levels Anthropic hard