Video coming soon
We're producing a video walkthrough — check back soon.
What you'll learn
- 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
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.
Get comfortable with the exact loop-invariant template (inclusive vs. exclusive bounds) before moving on to rotated arrays and answer-space problems like Koko Eating Bananas.