In this video, we solve the problem "Array Division" from the CSES Problem Set using **Binary Search on the Answer** combined with a **greedy check**.
🚀 What you’ll learn in this video:
- How to identify binary search on answer problems
- How to define the search space and check function
- How greedy works in splitting arrays into K parts
- Step-by-step C++ implementation with time & space complexity
- How to debug and intuitively reason through prefix-based partitions
📚 Problem:
You are given an array and asked to divide it into exactly k subarrays such that the maximum sum among them is minimized. Classic variation of Painter Partition and Load Balancing.
💡 Techniques used:
- Binary Search on Range
- Greedy partitioning
- Prefix sum reasoning
- Optimized code walkthrough
👨💻 Platform: CSES Problem Set
🔗 Problem link: https://cses.fi/problemset/task/1085/
⏱ Time Complexity: O(n * log(sum))
📦 Space Complexity: O(n)
If you're preparing for competitive programming contests or job interviews, mastering this pattern is a must!
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