Find Longest Special Substring That Occurs Thrice 1

Move Pieces to Obtain a String Problem

Alien Dictionary

Amount of New Area Painted Each Day

Brace Expansion

Longest Substring of One Repeating Character

Longest Substring with Same Letters after Replacement

Minimum Possible Integer After at Most K Adjacent Swaps On Digits

Palindromic Substrings

Verify Preorder Serialization of a Binary Tree

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