Core · Module 7 · Lesson 5 of 11
Classic Algorithms: Predicates, Iterators and Output Ranges
Replace repetitive loops with tested search, copy and ordering algorithms, then state the iterator and predicate guarantees each call requires.
By the end you can
- Explain how iterator pairs let one algorithm span containers
- Apply sort, find and copy_if with correct predicates and bounds
- Predict invalidation and complexity when mixing mutation with traversal
Builds on Associative Containers: map, set and unordered_map.
01 · A question first
Three loops scan the catalogue for cheap books, sort titles by year and copy matches into a result list. Each loop hand-rolls bounds, off-by-one errors creep in, and the intent hides. What single vocabulary lets one tested algorithm serve every container, and what does each call promise?
Make a guess before you read on.
02 · The idea
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What's inside
- Start with the problem
- How the idea works
- Why it is correct
- What it costs
- Pitfalls and variations
- How to read a range without an index
- Where it is used
03 · Practice
Asked in interviews
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