Pairing

ABC 378
All Problems

Problem 38 of 50

Easy

What to do

You have four balls, each with a color represented by a number. Your goal is to find out how many pairs of balls you can remove if you can only remove two balls of the same color at a time.

Key Concepts

arrays or lists counting basic math loops

Examples

Input: [2, 1, 2, 1]

Output: 2

Input: [4, 4, 4, 1]

Output: 1

LeetCode Playground View on AtCoder

Tips for Beginners

  • Focus on understanding the logic, not memorizing syntax
  • Use print statements to debug your code
  • Don't worry about input parsing - the function handles that for you
  • If stuck, try writing out your solution on paper first

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