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Grokking the Coding Interview Patterns in Go

Solution: Bulls and Cows

Explore the Bulls and Cows problem by understanding how to use a hash map to count bulls and cows efficiently. Learn to implement a single pass solution that tracks unmatched digits and returns a formatted hint. This lesson helps you grasp hash map operations and optimize time and space complexities in solving common coding challenges.

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Statement

You are playing a number guessing game called “Bulls and Cows” with a friend.

You write down a secret number, and your friend tries to guess it. After each guess, you provide a hint based on the following:

  • Bulls: The number of digits that are in the correct position in the guess.

  • Cows: The number of digits that are in both the secret and the guess but ...