好几天没有认真刷题了，这两天猛刷了一把SQL题目。然后用hexo搭建了自己的BLOG，还在摸索中，后续渐渐的就会两边都同步文章。

Given a string containing only digits, restore it by returning all possible valid IP address combinations.

Reverse a linked list from position m to n. Do it in one-pass.Note: 1 ≤ m ≤ n ≤ length of list.

Say you have an array for which the ith element is the price of a given stock on day i.

Given an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the array represents your maximum jump length at that position.Determine if you…

将一个字符串解码，要求按照次数展开原字符串中的中括号。如3[a]2[bc]对应的字符串就是aaabcbc，即a展开3次，bc展开2次。注意，源字符串中的括号是允许嵌套的，且展开的字符中不会包含任何数字。

将1~n这n个数字按照字母序排序，并返回排序后的结果。即如果n=13，则1~13的字母序为1,10,11,12,13,2,3,4,5,6,7,8,9

Given a set of distinct integers, nums, return all possible subsets (the power set).

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

Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties:Integers in each row are sorted from left to right.The first integer of each row …