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Solution: Bulls and Cows

Explore the Bulls and Cows game solution by using a Hash Map to efficiently count bulls and cows. Understand how to track unmatched digits in a single pass, and learn to implement a space-efficient approach to solve this common coding problem in C++.

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 ...