Module 2: Core Interview Patterns
Binary Search
The exact loop-invariant template for searching sorted arrays, rotated arrays, and binary search on a monotonic answer space.
4 Problems4 PatternsBeginner → Intermediate
What is Binary Search?
Binary search is not just "find a value in a sorted array" — the more valuable interview skill is binary search on the answer: searching over a monotonic decision space rather than an explicit sorted array.
Key ideas
- Write the inclusive-bounds binary search template without off-by-one errors
- Recognise when a problem is 'binary search on the answer' rather than a literal sorted-array search
- Adapt the template for rotated sorted arrays
Recommended Learning Order
- 01Binary Search3 problems
- 02Binary Search on Answer1 problem
Learning tracks
- Essential
- 3problems
- Must Do problems only
- Interview Ready
- 4problems
- Must Do + Recommended
- Complete Mastery
- 4problems
- Every curated problem
Problems
0 / 4 completed
Showing 4 of 4 problems
| Status | Problem | Pattern | Difficulty | Priority | Article | Video | Solve |
|---|---|---|---|---|---|---|---|
| Binary Search | Binary Search | Easy | Must Do | Read | Coming Soon | Solve | |
| Search Insert Position | Binary SearchLower Bound | Easy | Must Do | Read | Coming Soon | Solve | |
| Search in Rotated Sorted Array | Binary SearchRotated Array | Medium | Must Do | Read | Coming Soon | Solve | |
| Koko Eating Bananas | Binary Search on Answer | Medium | Recommended | Read | Coming Soon | Solve |