Given a string s, partition s such that every substring of the partition is a palindrome. Retur…

Given n, how many structurally unique BST’s (binary search trees) that store values 1R…

You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (cl…

Given two sorted integer arrays A and B, merge B into A as one sorted array. Note: You may assume that A has e…

Given a non-negative number represented as an array of digits, plus one to the number. The digits are stored s…

Given two integers n and k, return all possible combinations of k numbers out of 1 &#…

Given two words (start and end), and a dictionary, find the length of shortest transformation sequen…

Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 migh…

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. …

Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numb…

Given a digit string, return all possible letter combinations that the number could represent. A mapping of di…

Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. 将…