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Grokking the Coding Interview Patterns in JavaScript

Solution: Bulls and Cows

Explore the solution for the Bulls and Cows game by using hash maps to count bulls and cows in one pass. Understand how to track digit matches and mismatches efficiently to return the correct hint, and analyze the time and space complexity of this method.

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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 ...