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并查集(UnionFind) 系列

547. Number of Provinces Medium There are n cities. Some of them are connected, while some are not. If city a is connected directly with city b, and city b is connected directly with city c, then city a is connected indirectly with city c. A

547. Number of Provinces 省份数量

There are n cities. Some of them are connected, while some are not. If city a is connected directly with city b, and city b is connected directly with city c, then city a is connected indirectly with city c. A province is a group of directly or i

[SAA + SAP] 09. DynamoDB

S3 is not good at searching object We can use DynamoDB to save the metadata of S3 object Then do the search in DyanmoDB If you need to get data directly from DynamoDB, DAX is good for that If you need to perform some calucation which needs quite a bit

vue项目Avoid mutating a prop directly since the value will be overwritten ....... itemObject 子组件不能直接改

这个错误的本质原因就是:子组件不能直接修改父组件的值,子组件只能把值传递给父组件,修改值的权利只有父组件自己有,保证了数据修改的唯一性           这样就会出问题,修改后:  

MB Star SD C4/C5 Diagnostic Tool for Mercedes Benz Software Upgraded to 2019.09

Some customers consult about the latest software version for MB Star , the latest software update to 2019.09 now , please check the software details as bellow : 1. DAS 2019.09: the automatically Diagnosis Assistance System 2. Xentry 2019.09: New software

Client Applications

A client application (CA) is the software that makes use of functionality in the Trusted Application. It may do so directly or it may act as a routing node (for example, directing a cloud service or Java application to the TA). A CA runs in the Normal Wor

vue .sync的使用

在使用vue的. sync中,怎么都用不出来。 出来错误: I Avoid mutating a prop directly since the value will be overuritten whenever the parent component re-renders. 查资料,说的都是vue2以上,取消了.sync..只能在vue1以下用. 可官方的资料中可以用呀: .sync 修饰符. 官方的

CyclicBarrier正确的使用方法和错误的使用方法

CyclicBarrier是java推出的一个并发编程工具,它用在多个线程之间协同工作。线程约定到达某个点,到达这个点之后的线程都停下来,直到最后一个线程也到达了这个点之后,所有的线程才会得到释放。常用的场景是:多个worker线程,每个线程都在循环地做一部分工作,并在最后用cyclicBarrier.await()