Lomsat gelral CodeForces - 600E (tree heuristic merge)

You are given a rooted tree with root in vertex 1. Each vertex is coloured in some colour. Let's call colour c dominating in the subtree of vertex v if there are no other colours that appear in the subtree of vertex v more times than colour c. So it's possible that two or more colours will be dominating in the subtree of some vertex. The subtre ...

Posted on Tue, 06 Aug 2019 02:14:24 -0700 by Virvo

zookeeper--Implementing Distributed Lock

1: Multithreading The characteristic of java language is multithreading, of course, there will be corresponding challenges under the advantages. In multithreading environment, thread security becomes a problem that developers must avoid. When a thread shares a variable, according to the memory model, each thread has its own local memory, and t ...

Posted on Mon, 05 Aug 2019 19:47:44 -0700 by ph3n0m

Thread Synchronization - Read and Write Locks

Reader-writer lock Reader-writer locks are similar to mutexes, but read-write locks allow higher parallelism.Mutexes are either locked or unlocked and can be locked by only one thread at a time.Read and write locks can have three states: read mode locked state, write mode locked state and unlocked state.Only one thread at a time can hold read- ...

Posted on Mon, 05 Aug 2019 11:45:05 -0700 by SkyRanger

Several common loop traversals in javascript

In project development, no matter which framework is built, data processing is necessary, and data processing can not be separated from various traversal cycles. There are many ways of loop traversal in javascript. Record several common js loop traversals. I. for cycle for loops should be the most common, the most used method of loop traversa ...

Posted on Mon, 05 Aug 2019 03:51:29 -0700 by kester

First Understanding RabbitMQ Arrangement

Introduction to RabbitMQ RabbitMQ is a message queue that acts as a proxy, allowing software and applications to connect and expand. These applications can be linked together to form a larger application, or connect user equipment and data. Message system achieves asynchronization and decoupling of applications by separating the sending and re ...

Posted on Mon, 05 Aug 2019 03:42:42 -0700 by ctsttom

Netty Source Analysis--FastThreadLocal Analysis

The source code for ThreadLocal was discussed in the previous section, so let's look at FastThreadLocal in this section.I think it's simpler than ThreadLocal because it's more efficient due to the lack of cleanup and cleanup of Entry. Like ThreadLocal, we'll start with a structure diagram:        See how this diagram differs from ThreadLocal by ...

Posted on Sun, 04 Aug 2019 10:48:05 -0700 by tllewellyn

python-object-oriented-double bottom method

_ str_ and repr__ class Course(object): def __init__(self, name, price): self.name = name self.price = price def __str__(self): return "func is __str__ ,curriculum:{},Price:{}".format(self.name, self.price) # python = Course("python", 25000) print(python) # Func is__str_, course: python, price: 25 000 print(" ...

Posted on Sun, 04 Aug 2019 07:49:17 -0700 by kingconnections

python-object-oriented-reflection

isinstance and issubclass isinstance(obj,cls) checks whether obj is an object of class CLS class Test: def __init__(self, var): self.var = var def show(self): print("Ha-ha!") t = Test('test') a = 'test' print(isinstance(t, Test)) # True print(isinstance(a, Test)) # False The difference between isinstance and type ...

Posted on Sun, 04 Aug 2019 07:42:17 -0700 by dfarrell

Virtual Functions in Inheritance such as C++ Learning (Notes)

1. Polymorphic Behavior Polymorphism is a feature of object-oriented languages, which enables us to deal with different types of objects in a similar way. In C++ we can realize subtype polymorphism by inheriting hierarchical structure. We can learn more about polymorphism through the following code:   #include<iostream> using name ...

Posted on Sun, 04 Aug 2019 03:05:21 -0700 by IceRegent

OpenGL Introduction 8: Camera

This is a personal learning record, learning suggestions to see the tutorial https://learnopengl-cn.github.io/ Thank you very much to the original author Joey DeVries and many excellent tutorials for Chinese translators. Recent developments Preface We already know what observation matrices are and how to use them to move scenarios (we moved a l ...

Posted on Sat, 03 Aug 2019 08:48:52 -0700 by vickyjackson