swap-for-longest-repeated-character-substring

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1156. Swap For Longest Repeated Character Substring (Medium)

You are given a string text. You can swap two of the characters in the text.

Return the length of the longest substring with repeated characters.

 

Example 1:

Input: text = "ababa"
Output: 3
Explanation: We can swap the first 'b' with the last 'a', or the last 'b' with the first 'a'. Then, the longest repeated character substring is "aaa" with length 3.

Example 2:

Input: text = "aaabaaa"
Output: 6
Explanation: Swap 'b' with the last 'a' (or the first 'a'), and we get longest repeated character substring "aaaaaa" with length 6.

Example 3:

Input: text = "aaaaa"
Output: 5
Explanation: No need to swap, longest repeated character substring is "aaaaa" with length is 5.

 

Constraints:

• 1 <= text.length <= 2 * 104
• text consist of lowercase English characters only.

Related Topics

[String] [Sliding Window]

Hints

Hint 1

There are two cases: a block of characters, or two blocks of characters between one different character. By keeping a run-length encoded version of the string, we can easily check these cases.