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Grokking the Coding Interview Patterns in Python

Bulls and Cows

Understand how to implement hash maps to solve the Bulls and Cows game by calculating bulls and cows from guesses. Learn to assess positions and digit matches to return accurate hints, reinforcing problem-solving with hash maps.

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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 in different positions. (These are non-bull digits that could become bulls if rearranged.) ...