Leetcode Problem 2351. First Letter to Appear Twice

2351. First Letter to Appear Twice

Leetcode Solutions

Using a Set to Track Repeated Characters

  1. Initialize an empty set to keep track of characters.
  2. Iterate through each character in the string.
  3. For each character, check if it is already in the set.
  4. If the character is in the set, return it as it is the first character to appear twice.
  5. If the character is not in the set, add it to the set.
  6. Continue the iteration until a repeated character is found.
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Brute Force Search for Repeated Characters

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