@param A: An integer array. @param target: An integer.

@param a a number @param b a number @return the result

@param l1: the first list @param l2: the second list @return: the sum list of l1 and l2

@param s: The first string @param b: The second string @return true or false

@param m: An integer m denotes the size of a backpack @param A: Given n items with size A[i] @return: The maximum size

@param m: An integer m denotes the size of a backpack @param A & V: Given n items with size A[i] and value V[i] @return: The maximum value

@param nums: The integer array. @param target: Target to find. @return: The first position of target. Position starts from 0.

@param root the root of binary tree @param target an integer @return all valid paths

@param root the root of the binary tree @return all root-to-leaf paths

@param root: The root of tree @return: the head of doubly list node

@param A: a list of integer @return: The root of Segment Tree

@param start, end: Denote an segment / interval @return: The root of Segment Tree

@param preorder : A list of integers that preorder traversal of a tree @param inorder : A list of integers that inorder traversal of a tree @return :

@param A: A list of integers @return: The boolean answer

@param n: An integer @return: An integer

@param n: Given the range of numbers @param k: Given the numbers of combinations @return: All the combinations of k numbers out of 1..n

@param A : A string includes Upper Case letters @param B : A string includes Upper Case letter @return : if string A contains all of the characters i

@param pHead: The pHead of linked list with a random pointer. @return: A new pHead of a deep copy of the list.

@param intervals: An interval array @return: Count of airplanes are in the sky.

@param A: An integer array @return: The number of element in the array that are smaller that the given integer

@param num: an integer @return: an integer, the number of ones in num

@param ListNode head is the head of the linked list @return: ListNode head of linked list

@param node: the node in the list should be deleted @return: nothing

@param n: an integer @return an integer f(n)

@param n: An integers. @return: An integer which is the first bad version.

@param num: a rotated sorted array @return: the minimum number in the array

@param nums: an array of integers @return: an integer

@param A: An integers array. @return: return any of peek positions.

@param n: an integer @return: a boolean which equals to true if the first player will win

param n: As description. return: A list of strings.

@param root: a TreeNode, the root of the binary tree @return: nothing

@param n n pairs @return All combinations of well-formed parentheses

@param headA: the first list @param headB: the second list @return: a ListNode

@param shapeType a string @return Get object of type Shape

@param type a string @return Get object of the type

@param n a number @return Gray code

@param A: An array of non-negative integers. return: The maximum amount of money you can rob tonight

@param nums1 an integer array @param nums2 an integer array @return an integer array

@param nums1 an integer array @param nums2 an integer array @return an integer array

@param A, queries: Given an integer array and an query list @return: The result list

@param A, queries: Given an integer array and an query list @return: The result list

@param n an integer @return true if this is a happy number or false

@param s A string @return Whether the string is a valid palindrome

@param T1, T2: The roots of binary tree. @return: True if T2 is a subtree of T1, or false.

@param num an integer @return true if num is an ugly number or false

@param str: a string @return: a boolean

@param originalStr the string we want to append to with spaces @param size the target length of the string @return a string

@param digits A digital string @return all posible letter combinations

@param root: The root of binary tree. @return: Level order a list of lists of integer

@param A, B: Two string. @return: the length of the longest common substring.

@param A an array of Integer @return an integer

@param nums: The integer array @return: The length of LIS (longest increasing subsequence)

@param dictionary: an array of strings @return: an arraylist of strings