Leetcode Problem 1156. Swap For Longest Repeated Character Substring

1156. Swap For Longest Repeated Character Substring

Leetcode Solutions

Group and Count Approach

  1. Use itertools.groupby to group consecutive identical characters and count their lengths.
  2. Use collections.Counter to count the total occurrences of each character in the string.
  3. Initialize a variable res to store the maximum length found.
  4. Iterate over the groups, updating res with the maximum length of a group possibly extended by 1, considering the total count of that character.
  5. Iterate over the groups again, checking for adjacent groups with a single different character in between. If found, update res with the combined length of these groups plus 1 if an additional identical character is available for swapping.
  6. Return the value of res.
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Sliding Window Approach

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