Find Longest Special Substring That Occurs Thrice 2

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 with Same Letters after Replacement

Palindromic Substrings

Verify Preorder Serialization of a Binary Tree

Adding Spaces to a String

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