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进程状态的切换 就绪状态(ready): 等待被调度 运行状态(running): 正在被调度 阻塞状态(waiting): 等待资源 注意 只有就绪态和运行...
进程控制块(Process Control Block, PCB)描述进程的基本信息和运行状态, 所谓的创建进程和撤销进程, 都是对于PCB的操作.
ACID 原子性(Atomicity) 事务被分割为不可分割的最小单元, 事务的所有操作要么全部提交成功, 要么全部回滚失败. 一致性(Consist...
内存模型 堆(heap) 由new分配出来的内存块, 其释放编译器不去管, 由程序去控制, 一个new对应一个delete. 如果没有释放掉, 在程序结束时...
A school bought the first computer some time ago. During the recent years the sc...
The simplest text editor “Open Word” allows to create and edit only one word. Th...
Every city in Berland is situated on Ox axis. The government of the country deci...
You are a professional robber planning to rob houses along a street. Each house ...
Given a binary tree, imagine yourself standing on the right side of it, return t...
Given an integer, write a function to determine if it is a power of two.
确保Class文件的字节流中包含的信息符合虚拟机的要求, 并且不会危害虚拟机的安全.
需要进行序列化的类需要实现Serializable接口, 但是不需要实现任何方法.
Given a 2d grid map of '1's (land) and '0's (water), count the number of islands...
Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of ...
Write an algorithm to determine if a number is “happy”.
Remove all elements from a linked list of integers that have value val.
Suppose that a website contains two tables, the Customers table and the Orders t...
The Employee table holds all employees. Every employee has an Id, a salary, and ...
The Employee table holds all employees. Every employee has an Id, and there is a...
All DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, fo...
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