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原创 数组移0到末尾(不能新建数组)
Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.For example, given nums = [0, 1, 0, 3, 12], after calling your func...
2018-03-08 16:49:22
521
原创 机器人到达终点有几条路径(动态规划)
无障碍版本:A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below).The robot can only move either down or right at any point in time. The robot is trying to reach th...
2018-03-08 15:19:13
2507
原创 给有序数组去重
Given a sorted array, remove the duplicates in-place such that each element appear only once and return the new length.Do not allocate extra space for another array, you must do this by modifying the ...
2018-03-08 15:14:29
1528
原创 最大蓄水量问题
Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai) and (i, 0). Find two ...
2018-03-08 15:09:36
540
原创 电话号码可能组成的字符串
Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the telephone buttons) is given below.Input:Digit string "23"...
2018-03-08 15:05:44
663
原创 字符串中最长回文字符串
Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000.Example:Input: "babad"Output: "bab"Note: "aba" is also a valid answer. Example:I...
2018-03-08 15:04:02
206
原创 字符串中非重复子串
Given a string, find the length of the longest substring without repeating characters.Examples:Given "abcabcbb", the answer is "abc", which the length is 3.Given "bbbbb", the answer is "b", with the l...
2018-03-08 14:59:16
251
转载 MD5算法循环中为什么会有 & 0XFF
在32位的电脑中数字都是以32格式存放的,如果是要求一个byte(8位)类型的数字,对于int这种32位的整形,高24位具有随机性(从所有的数字形式来看,前面的24位取值并不确定,我把它视为具有一定的随机性,比如int型的整数,高24位的取值都是不确定的。),低8位才是实际的数据。java.lang.Integer.toHexString() 方法的参数是int(32位)类型,如果
2017-12-08 10:58:02
760
转载 android studio 3.0版本升级问题
android studio 3.0版本升级问题修改:===》 问题一[java] view plain copy print?Error:Cannot choose between the following configurations of project :pickerview: - debugApiEl
2017-11-20 17:54:32
1572
原创 android SOCKET编程中出现connection reset
在android socket编程中,在PC端和PC上的模拟器实验一个APP,功能无报错运行。但是把服务器程序移植到笔记本上,真机连接笔记本时,修改了客户端socket的连接的IP地址后(这个IP是在笔记本联网后,在cmd下使用ipconfig查到的外网IP),手机向服务器发出请求时,却报出了connection reset错误。发现自己忘记了手机通过 wifi 连接笔记本时,这时候手机应当属于局...
2017-10-30 14:59:34
2102
原创 编译原理-逆波兰表达式JAVA算法
Demo基于Java语言[java] view plain copy "font-size:18px;">public class InversePoland { // 9+(3-1)*3+10/2 = 20 //private static String[] ss = new String[]{"9","+","("
2016-11-21 00:22:44
340
原创 编译原理中的逆波兰表达式(数据流图中运算变量的流程)
表达式一般由操作数(Operand)、运算符(Operator)组成,例如算术表达式中,通常把运算符放在两个操作数的中间,这称为中缀表达式(Infix Expression),如A+B。波兰数学家Jan Lukasiewicz提出了另一种数学表示法,它有两种表示形式:把运算符写在操作数之前,称为波兰表达式(Polish Expression)或前缀表达式(Prefix Ex
2016-11-21 00:08:03
1265
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