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dup2函数

将当前系统中的进程信息打印到文件中命令行:psaux>out将ps得到的信息重定向到out文件中 使用dup2文件在程序中完成。intdup2(intoldfd,intnewfd);/***dup2.c***/#include<stdio.h>#include<fcntl.h>#...
代码星球 ·2020-04-09

1109 Group Photo (25 分)

Formationisveryimportantwhentakingagroupphoto.Giventherulesofforming K rowswith N peopleasthefollowing:Thenumberofpeopleineachrowmustbe ...
代码星球 ·2020-04-08

1106 Lowest Price in Supply Chain (25)

Asupplychainisanetworkofretailers(零售商),distributors(经销商),andsuppliers(供应商)--everyoneinvolvedinmovingaproductfromsuppliertocustomer.Startingfromonerootsupplier,e...
代码星球 ·2020-04-08

1090 Highest Price in Supply Chain (25)(25 分)

Asupplychainisanetworkofretailers(零售商),distributors(经销商),andsuppliers(供应商)--everyoneinvolvedinmovingaproductfromsuppliertocustomer.Startingfromonerootsupplier,e...

1037. Magic Coupon (25)

ThemagicshopinMarsisofferingsomemagiccoupons.EachcouponhasanintegerNprintedonit,meaningthatwhenyouusethiscouponwithaproduct,youmaygetNtimesthevalueofthatproduct...
代码星球 ·2020-04-08

1090. Highest Price in Supply Chain (25)

Asupplychainisanetworkofretailers(零售商),distributors(经销商),andsuppliers(供应商)--everyoneinvolvedinmovingaproductfromsuppliertocustomer.Startingfromonerootsupplier,e...

1079. Total Sales of Supply Chain (25)

Asupplychainisanetworkofretailers(零售商),distributors(经销商),andsuppliers(供应商)--everyoneinvolvedinmovingaproductfromsuppliertocustomer.Startingfromonerootsupplier,e...
代码星球 ·2020-04-08

1097. Deduplication on a Linked List (25)

GivenasinglylinkedlistLwithintegerkeys,youaresupposedtoremovethenodeswithduplicatedabsolutevaluesofthekeys.Thatis,foreachvalueK,onlythefirstnodeofwhichthevalueo...

1011. World Cup Betting (20)

Withthe2010FIFAWorldCuprunning,footballfanstheworldoverwerebecomingincreasinglyexcitedasthebestplayersfromthebestteamsdoingbattlesfortheWorldCuptrophyinSouthAfr...
代码星球 ·2020-04-08

解读typescript中 super关键字的用法

解读typescript中super关键字的用法传统的js,使用prototype实现父、子类继承.如果父、子类有同名的方法,子类去调用父类的同名方法需要用 “父类.prototype.method.call(this)”.但是在typescript中,提供了一个关键字super,指向...

I’ve seen the world,lit it up as my stage now

I’veseentheworld,lititupasmystagenow阅尽繁华点亮红尘做舞台Channelingangelsin,thenewagenow粉末登场有你有我新时达Hotsummerdays,rockandrollThewayyou’dplayormeatyourshow激情夏日 知君歌舞皆为我...
代码星球 ·2020-04-08

Nginx配置upstream实现负载均衡

Nginx可以配置代理多台服务器,当一台服务器宕机之后,仍能保持系统可用。具体配置过程如下:1.在http节点下,添加upstream节点。upstreamlinuxidc{    server10.0.6.108:7080;    ser...

react之组件的shouldcomponentUpdate使用&&Component与PureComponent

1). Component存在的问题?        a. 父组件重新render(), 当前组件也会重新执行render(), 即使没有任何变化    &nb...

react项目Bug:组件销毁清除监听(Can't perform a React state update on an unmounted component.)

最近一直在做react项目,发现一个bug,困扰了我两天。Can'tperformaReactstateupdateonanunmountedcomponent.Thisisano-op,butitindicatesamemoryleakinyourapplication.Tofix,cancelallsubscrip...

React动画库之react-transition-group(入场enter、出场exit、初始化appear)

React动画通常有三种方法实现从易到难为:1、transition(CSS3自带)2、animation(CSS3自带)3、react-transition-group动画库(需要引入插件)  react生态圈十分庞大,类似于动画库有很多,这里我们介绍一款react-transition-grou...
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