Leetcode Problem 299. Bulls and Cows

299. Bulls and Cows

Leetcode Solutions

HashMap: Two Passes

  1. Initialize bulls and cows to zero.
  2. Create a hashmap h to store the frequency of each digit in secret.
  3. Iterate over secret and guess simultaneously.
    • If the current characters match, increment bulls.
    • If they don't match, check if the character from guess is in secret using the hashmap.
      • If it is, and the frequency is positive, increment cows.
      • Update the hashmap by decrementing the frequency of the digit from guess.
  4. Iterate over guess to finalize the count of cows.
  5. Return the hint formatted as "xAyB", where x is the number of bulls and y is the number of cows.
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One Pass with Array

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