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Grokking the Coding Interview Patterns in JavaScript

Solution: Bulls and Cows

Explore how to apply hash map techniques to solve the Bulls and Cows number guessing game. Understand the step-by-step logic to count bulls and cows in one pass, manage unmatched digits, and return the final hint. This lesson helps you master using hash tables to solve string comparison problems with optimal time and space complexity.

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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 ...