Leetcode Problem 424. Longest Repeating Character Replacement

424. Longest Repeating Character Replacement

Leetcode Solutions

Approach: Sliding Window (Fast)

  1. Initialize start to 0 and end to -1, representing the start and end of the window respectively.
  2. Initialize a frequency map to track the count of characters within the window.
  3. Expand the window by moving the end pointer forward until the window becomes invalid.
  4. Update the frequency map and the maximum frequency maxFrequency when a new character is added to the window.
  5. If the window is invalid, move the start pointer forward and update the frequency map accordingly.
  6. Keep track of the length of the longest valid window in longestSubstringLength.
  7. Repeat steps 3-5 until the end pointer reaches the end of the string.
  8. Return longestSubstringLength as the result.
UML Thumbnail

Approach: Sliding Window + Binary Search

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