Optimizing TikTok Collectible Packs

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Problem Overview

  • Find the minimum extra cards needed to create more than one pack where each pack has equal quantities of every card type.
  • Input: int array cardTypes (size n). Output: int minimum additions. Constraints: 1 ≤ n ≤ 1e5, 1 ≤ cardTypes[i] ≤ 500.
  • Domain: TikTok Collectibles packs requiring even distribution across card categories.
  • Source: TikTok/ByteDance coding interview question; a practical interview problem from TikTok interviews.

Example

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