CustomCC0-1.0#cptp0201500
Longest Subarray with Limited Changes
Summary
- •Phase 4 / sliding_window, frequency_map
- •Reasoning-first competitive programming drill
Problem Description
Given an array of n integers and an integer k, find the length of the longest subarray where you can change at most k elements to any value to make all elements equal.
How to read this problem in plain language:
- This is a Phase 4 reasoning drill focused on slidin, frequenc.
- Typical lenses to test first: sliding-window, arrays, frequency.
- Constraints reminder: 1 ≤ , 0 ≤ , 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 ≤ , 0 ≤ , 1 ≤
Analysis
Key Insight
The goal is to force explicit intermediate reasoning before revealing more.
sliding-windowarraysfrequency