3Longest Substring Without Repeating CharactersMediumSolve → 4Longest Palindromic SubstringMediumSolve → 6Maximum Side Length of a Square with Sum Less than or Equal to ThresholdMediumSolve → 8Closest Binary Search Tree ValueEasySolve → 9Integer to English WordsHardSolve → 10Maximum Difference Between Even and Odd Frequency IIHardSolve → 12Minimum Cost Good CaptionHardSolve → 14Department Top Three SalariesHardSolve → 15Product of Array Except SelfMediumSolve →