题目描述 Given an index k, return the kth row of the Pascal’s triangle. For example, given k = 3, Return [1,3,3,1]…

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

  Given a linked list and a value x, partition it such that all nodes less than x come bef…

  Given a non-negative integer num, repeatedly add all its digits until the result has only one digi…

  During the NBA playoffs, we always arrange the rather strong team to play with the rather weak team, li…

题目 给定一棵二叉查找树和一个新的树节点，将节点插入到树中。 你需要保证该树仍然是一棵二叉查找树。 分析 分别用递归和非递归两种方法实现。本质上会发现，两种方法类似 public class Solution { /**…

题目： The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: …

  Given a string, find the length of the longest substring without repeating characters. Exampl…

  You need to find the largest value in each row of a binary tree. Example: Input: 1 / \ 3 2 / \ \ 5 3 9 …

题目描述 Sort a linked list in O(n log n) time using constant space complexity. 分析 O(n log n) 的时间复杂度，归并排序最好，因为它不会因…

题目描述 Given an absolute path for a file (Unix-style), simplify it. For example, path = “/home/”, => “/home” …

  We are given head, the head node of a linked list containing unique integer values. We a…