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系统相关命令
Linux 系统状态的查看及管理工具: pstree ps pgrep&&pkill pidof top htop uptime vmstat iostat pmap glances dstat kill killall nohup screen systemd tmpfiles sleep chk ...
分类:其他好文   时间:2018-02-14 16:43:18    阅读次数:356
【Leetcode】322. Coin Change
You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you nee ...
分类:其他好文   时间:2018-02-12 23:41:52    阅读次数:345
Phone numbers
Phone number in Berland is a sequence of n digits. Often, to make it easier to memorize the number, it is divided into groups of two or three digits. ...
分类:其他好文   时间:2018-02-10 14:00:28    阅读次数:212
Laser
Petya is the most responsible worker in the Research Institute. So he was asked to make a very important experiment: to melt the chocolate bar with a ...
分类:其他好文   时间:2018-02-09 23:53:07    阅读次数:244
HDU 4045 Machine scheduling (第二类斯特林数+DP)
A Baidu’s engineer needs to analyze and process large amount of data on machines every day. The machines are labeled from 1 to n. On each day, the eng ...
分类:系统相关   时间:2018-02-04 00:31:25    阅读次数:196
UVA 3942 -- Remember the Word (字典树+dp)
Remember the Word Neal is very curious about combinatorial problems, and now here comes a problem about words. Knowing that Ray has a photographic mem ...
分类:其他好文   时间:2018-02-03 20:02:30    阅读次数:166
一种登记账后余额的处理方法
支付系统的记账业务,需要登记每笔记账流水的账后余额。在大规模并发条件下,简单使用乐观锁或者悲观锁都回严重的锁定数据库,导致性能变慢,下面介绍优化前和优化后的两种处理思路。 第一种方案,使用乐观锁实现过程:Step1:从账户中获取最近余额以及账户当前版本号,代码如下:Select version, b ...
分类:其他好文   时间:2018-02-01 23:18:37    阅读次数:318
6-7 Quantifiers
1 Quantifiers are used to describe the number or amount of something. Certain quantifiers are used with certain kinds of nouns. a couple of a little a ...
分类:其他好文   时间:2018-01-30 17:13:07    阅读次数:154
python 迭代器
#!/usr/bin/env python # -*- coding: utf-8 -*- # @Time : 2018-01-22 22:09 # @Author : hhj# @Site : # @File : def cash_money(amount): while amount>0 amo ...
分类:编程语言   时间:2018-01-23 00:49:42    阅读次数:150
Leetcode 763. Partition Labels
思路:动态规划。对于属于coins的coin,只要知道amount-coin至少需要多少个货币就能表示,那么amount需要的货币数目=amount-coin需要的货币数目+1;如果amount-coin都不能被表示,amount也不能被表示。 方法一:递归,由上至下。 Next challenge ...
分类:其他好文   时间:2018-01-22 21:47:02    阅读次数:266
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