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Grokking the Coding Interview Patterns in Python

Solution: Bulls and Cows

Explore how to implement a Bulls and Cows game solution using hash maps to track unmatched digits. Learn to count bulls (correct digits in the right position) and cows (correct digits in wrong positions) in one pass for efficient problem solving.

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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 ...