[Solved] Given an integer array nums, move all 0’s to the end of it while maintaining the relative order of the non-zero elements.
[Solved] You are a product manager and currently leading a team to develop a new product. Unfortunately, the latest version of your product fails the quality check. Since each version is developed based on the previous version, all the versions after a bad version are also bad.
[Solved] Given an array nums containing n distinct numbers in the range [0, n], return the only number in the range that is missing from the array.
[Solved] Given an integer num, repeatedly add all its digits until the result has only one digit, and return it.
[Solved] Given the root of a binary tree, return all root-to-leaf paths in any order.
[Solved] Given two strings s and t, return true if t is an anagram of s, and false otherwise.
[Solved] You are given an array of integers nums, there is a sliding window of size k which is moving from the very left of the array to the very right. You can only see the k numbers in the window. Each time the sliding window moves right by one position.
[Solved] Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i].
[Solved] There is a singly-linked list head and we want to delete a node node in it. You are given the node to be deleted node. You will not be given access to the first node of head.