档案日期2015的30

题目描述：

Given two strings s and t, write a function to determine if t is an anagram of s.

For example,
s = "anagram", t = "nagaram", return true.
s = "rat", t = "car", return false.

Note:

You may assume the string contains ...

题目描述：

Given an array of integers, every element appears twice except for one. Find that single one.

Note:

Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory?

题目大意：

给定一个整数数组，除一个元素只出现一次外，其余各元素均出现两次。找出那个只出现一次的元素。

注意 ...

题目描述：

A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null.

Return a deep copy of the list.

题目大意：

给定一个链表，其中的节点包含一个额外的随机指针，可能指向链表中的任意一个节点或者为空。

返回链表的深拷贝。

解题思路：

解法I ...

题目描述：

Given a string of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. The valid operators are +, - and *.

Example 1

Input: "2-1-1".

((2-1)-1) = 0
(2-(1-1 ...