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Grokking the Coding Interview Patterns in Python

Solution: Bulls and Cows

Explore how to solve the Bulls and Cows number guessing game by applying a hash map and single-pass strategy. Understand how to count bulls (correct digits in place) and cows (correct digits misplaced) while managing unmatched digits efficiently.

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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 ...