Remove Duplicates from Sorted Array Question Given an integer array nums sorted in non-decreasing order, remove the duplicates in-place such that each unique element appears only once.

Remove Element Question Given an integer array nums and an integer val, remove all occurrences of val in nums in-place.

Longest Palindromic Substring Question Given a string s, return the longest palindromic substring in s.

Valid Parentheses Question Given a string s containing just the characters ‘(’, ‘)’, ‘{’, ‘}’, ‘[’ and ‘]’, determine if the input string is valid.

Palindrome Number Question Given an integer x, return true if x is a palindrome, and false otherwise.

Reverse Integer Question Given a signed 32-bit integer x, return x with its digits reversed.