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Valid Palindrome IV [Problem Link] You are given a 0-indexed string s consisting of only lowercase English letters. In one operation, you can change...

[Problem Link] Given an array of digit strings nums and a digit string target, return the number of pairs of indices (i, j) (where...

Given an integer array nums that may contain duplicates, return all possible subsets (the power set). The solution set must not contain duplicate subsets....

Given the root of a binary tree, flatten the tree into a “linked list”: – The “linked list” should use the same TreeNode class...

Given a list of non-negative integers nums, arrange them such that they form the largest number and return it.   Since the result may...

You are given the root of a binary tree containing digits from 0 to 9 only.   Each root-to-leaf path in the tree represents...

Given the head of a singly linked list and two integers left and right where left <= right, reverse the nodes of the list...

Given an array of non-negative integers nums, you are initially positioned at the first index of the array. Each element in the array represents...

Suppose an array of length n sorted in ascending order is rotated between 1 and n times. For example, the array nums = [0,1,4,4,5,6,7]...

Suppose an array of length n sorted in ascending order is rotated between 1 and n times. For example, the array nums = [0,1,2,4,5,6,7]...