CustomCC0-1.0#cp0121700
K-Divisible Subset Partition
Summary
- •Phase 5 / modulo, dp, multiset
- •Reasoning-first competitive programming drill
Problem Description
Given n positive integers, partition them into the minimum number of subsets such that, in each subset, the sum is divisible by k.
How to read this problem in plain language:
- This is a Phase 5 reasoning drill focused on modulo, dp, multiset.
- Typical lenses to test first: dp, greedy, partition.
- Constraints reminder: 1 ≤ 2 ≤ 1 ≤
Mini examples for mental simulation:
1) Boundary example: Describe why this case is tricky. Explain expected behavior and why naive logic may fail.
2) Adversarial example: Adversarial case where naive greedy/local decision looks correct but fails globally.
Lite-mode writing target:
- Write 1~2 observations that shrink the search space.
- Name one final algorithm and state target complexity explicitly.
- Validate with at least 2 edge cases and one hand simulation.
Constraints
- •1 ≤ 2 ≤ 1 ≤
Analysis
Key Insight
Use this hint to refine your reasoning. This step should reduce search space or formalize correctness. State why this insight changes your algorithm choice.
dpgreedypartitionmodulo