On Answer / Condition Function — Binary Search Patterns
The On Answer / Condition Function pattern applies when you need the On Answer / Condition Function technique within the Binary Search Patterns pattern. It is used in 8 problems on Thita, including Capacity To Ship Packages Within D Days, Koko Eating Bananas and Maximum Candies Allocated to K Children. Common variations are On Sorted Array/List and Find First/Last Occurrence.
Learn binary search on answer space for optimization problems like Koko eating bananas and capacity to ship packages.
On Answer / Condition Function is one of the 5 subpatterns of the Binary Search Patterns pattern, which covers standard binary search, rotated arrays, first/last occurrence, and search on answer space. The whole pattern is about 2.5 hours of study. This subpattern is a depth topic for once the core techniques are automatic.
What On Answer / Condition Function covers
Master binary search algorithms including standard search, rotated array search, search on answer space, and finding boundaries. Essential for efficient O(log n) solutions. Problems in this subpattern are usually searched for as binary search on answer, koko eating bananas, capacity ship packages, minimize maximum, leetcode 875, leetcode 1011.
How to practise On Answer / Condition Function on Thita.ai
Read the theory for On Answer / Condition Function, then work the problems attached to it in the browser editor. Your solution runs against the problem's test cases, and the AI coach offers a hint about the technique you are missing rather than a finished solution. Progress is tracked per subpattern, so the Binary Search Patterns tracker shows this one as covered once you have solved its problems.
Other subpatterns in Binary Search Patterns
- On Sorted Array/List — Master standard binary search on sorted arrays. Learn search insert position, sqrt calculation, and 2D matrix search.
- Find First/Last Occurrence — Learn to find first and last occurrence of elements using binary search. Master lower bound and upper bound concepts.
- Find Min/Max in Rotated Sorted Array — Master binary search in rotated sorted arrays. Find minimum, search elements, and handle duplicates.
- Median and Kth of Two Sorted Arrays — Master the binary search approach to find median of two sorted arrays in O(log(min(m,n))) time.
Related DSA patterns
- Two Pointers — Fast-slow, converging, expanding from center, and in-place modification techniques.
- Sliding Window — Fixed-size, variable-size, and character frequency matching window techniques.
- Array/Matrix Manipulation Patterns — In-place operations, hashing, prefix sums, spiral traversal, and cyclic sort.
- Linked List Manipulation Patterns — In-place reversal, merging sorted lists, reordering, and intersection detection.
Where to go next
On Answer / Condition Function is one lesson in a 16-pattern DSA course. If you are preparing end to end, work the interview-critical patterns first and use the pattern sheet as the checklist; if you are here for one technique, the Binary Search Patterns guide is the shortest path back to the rest of it.