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Grokking the Coding Interview Patterns in C#

Solution: Bulls and Cows

Explore how to implement a solution for the Bulls and Cows game by using hash maps to count digits accurately. Learn to identify bulls and cows with a single pass through the input, managing unmatched digits efficiently. This lesson helps you master hash map usage for character counting and improves problem-solving skills in coding interviews.

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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 ...