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video object Compatibility: safari browser does not support webm format Chrome browser supports webm format ie8 and the following do not support video tags. ie9 supports video tags, but mp4 format Firefox supports video in ogv format   Compatibility writing <video controls> <source src="data/demo.ovg"> &l ...

What is Kickstart Installations? Kickstart Installations for unattended automatic installation Kickstart files, which are ready before installation, can be used to automatically perform the installation. It can be saved on a single server system and supports one to many: that is, a single file installs CentOS on multiple computers All Kickst ...

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My LeetCode: https://leetcode-cn.com/u/ituring/ My LeetCode source code [GitHub]: https://github.com/izhoujie/Algorithmcii Square root of LeetCode 69. x subject Implement the int sqrt(int x) function. Calculates and returns the square root of X, where x is a non negative integer. Because the return type is an integer, the result only retains ...

My LeetCode: https://leetcode-cn.com/u/ituring/ My LeetCode source code [GitHub]: https://github.com/izhoujie/Algorithmcii The nearest common ancestor of a binary tree subject Given a binary tree, find the nearest common ancestor of two specified nodes in the tree. The definition of the nearest common ancestor in Baidu Encyclopedia is: " ...

Have you ever wanted to pick out the characters in one photo and then put them together in other pictures, so that even if you are in the end of the world, I can visit here? Professional people can use PhotoShop's "magic wand" tool to matting, and non professional people can use a variety of beauty APP to achieve, but after all, their ...

Safety configuration instruction [TOC] Database security configuration is one of the important links of database management. Security configuration mainly includes password, network access control, audit, etc. Next, we will explain how to realize the password related security configuration in Hangao database. 1 password encrypted storage The pa ...

1: Random Initialization When we use gradient descent or other advanced optimization algorithms, we need to select some initial values for the parameter theta.For advanced optimization algorithms, we assume by default that we have set the initial value for the variable theta: Similarly, for the gradient descent method, we also need to initi ...

Why do we need to specify meaningful thread names when creating threads or thread pools? The ultimate goal is to facilitate backtracking. In our daily development, a project will create many thread pools for resource isolation, but if we do not have a good name, it will be difficult to locate when there is a problem. public class Demo5 { ​ ...

I've seen all kinds of codes that use redis to implement distributed locks on the network. They are either wrong or fragmented. There is no complete example. Let me summarize two mechanisms of redis to implement distributed locks this weekend Spin lock and exclusive lock In view of the different ways of implementing locks, the policy pattern ...