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LeetCode—*Spiral Matrix问题,主要是用到了方向矩阵,很创意
Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order. For example, Given the following matrix: [ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8, 9 ] ] You ...
分类:其他好文   时间:2015-03-29 23:49:53    阅读次数:369
支付宝SDK简单集成
1. 从该网址下载集成开发包:https://b.alipay.com/order/productDetail.htm?productId=2014110308141993&tabId=4#ps-tabinfo-hash2. 从集成开发包中打开demo,找到如下文件,合入自己的代码中3.支付成功校验...
分类:其他好文   时间:2015-03-29 23:20:23    阅读次数:152
Oracle中Select语句完整的执行顺序
oracle Select语句完整的执行顺序:1、from 子句组装来自不同数据源的数据;2、where 子句基于指定的条件对记录行进行筛选;3、group by子句将数据划分为多个分组;4、使用聚集函数进行计算;5、使用having子句筛选分组;6、计算所有的表达式;7、使用order by对结果...
分类:数据库   时间:2015-03-29 19:20:07    阅读次数:109
【SICP练习】145 练习4.1
练习4-1原文Exercise 4.1. Notice that we cannot tell whether the metacircular evaluator evaluates operands from left to right or from right to left. Its evaluation order is inherited from the underlying Li...
分类:其他好文   时间:2015-03-29 18:08:21    阅读次数:136
[LeetCode] Spiral Matrix
Spiral Matrix Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order. For example, Given the following matrix: [ [ 1, 2, 3 ], [ 4, 5, 6 ], ...
分类:其他好文   时间:2015-03-29 16:31:20    阅读次数:132
MySQL分页查询
今天研究了一下MySQL的分页查询,记录并分享如下:           方式1:         select * from table order by id limit m, n;          该语句的意思为,查询m+n条记录,去掉前m条,返回后n条记录。无疑该查询能够实现分页功能,但是如果m的值越大,查询的性能会越低(越后面的页数,查询性能越低),因为MySQ...
分类:数据库   时间:2015-03-29 13:41:14    阅读次数:193
Flatten Binary Tree to Linked List
Flatten Binary Tree to Linked List问题:Given a binary tree, flatten it to a linked list in-place.思路: 前序pre-order遍历+prenode我的代码:public class Solution { ....
分类:其他好文   时间:2015-03-29 12:05:49    阅读次数:104
【SICP练习】135 练习3.66
练习3-66原文Exercise 3.66. Examine the stream (pairs integers integers). Can you make any general comments about the order in which the pairs are placed into the stream? For example, about how many pairs...
分类:其他好文   时间:2015-03-29 10:55:03    阅读次数:110
109【LeetCode】Convert Sorted List to Binary Search Tree
Given a singly linked list where elements are sorted in ascending order, convert it to a height balanced BST. {CSDN:CODE:630443}...
分类:其他好文   时间:2015-03-29 07:08:21    阅读次数:128
poj 2501 Average Speed
Average SpeedTime Limit:1000MSMemory Limit:65536KTotal Submissions:4842Accepted:2168DescriptionYou have bought a car in order to drive from Waterloo t...
分类:其他好文   时间:2015-03-28 18:36:56    阅读次数:124
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