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Grokking the Coding Interview Patterns in JavaScript

Solution: Bulls and Cows

Explore a single-pass hash map solution to the Bulls and Cows game, understanding how to count bulls and cows by comparing secret and guess strings. This lesson helps you implement an efficient algorithm with linear time complexity and constant space usage.

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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 ...