leetcode#263 Ugly Number

Write a program to check whether a given number is an ugly number.

leetcode#25 Reverse Nodes in k-Group

Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.

leetcode#24 Swap Nodes in Pairs

Given a linked list, swap every two adjacent nodes and return its head.

0 Telnet与远程登录

远程登录，即通过先登录一台主机，然后再通过网络远程登录到任何一台连接到网络的主机上（需要有登录账号和口令），而不需要为每一台主机连接一个硬件终端。

0 主要特点

FTP（File Transfer Protocol），文件传输协议，所提供的的文件传送功能可以将一个完整的文件从一个系统复制到另一个系统中。若要使用FTP，或需要有登录文件服务器的账号，或通过允许使用匿名FTP的文件服务器。

leetcode#19 Remove Nth Node From End of List

Given a linked list, remove the nth node from the end of list and return its head.

leetcode#2 Add Two Numbers

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

leetcode#445 Add Two Numbers II

You are given two non-empty linked lists representing two non-negative integers. The most significant digit comes first and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

leetcode#125 Valid Palindrome

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

leetcode#92 Reverse Linked List II

Reverse a linked list from position m to n. Do it in-place and in one-pass.