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Grokking the Coding Interview Patterns in C++

Bulls and Cows

Explore how to implement the Bulls and Cows number guessing game using hash maps. Learn to identify bulls and cows based on digit positions and matching digits, and apply efficient data structures to return hints accurately.

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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.) ...