通过alternatives进行多版本间切换
上周在学习单点登录安装CAS Overlay Template要使用指定版本,当时机器上安装了多个版本的jdk使用alternatives命令进行了切换
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技术实践与生活记录。
LeetCode – Maximum Depth of Binary Tree
Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.…
LeetCode – Minimum Depth of Binary Tree
Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node.…
Linux Swap 启停及swappiness设置
可以通过磁盘分区和文件两种方式进行操作
The XY Problem
原文链接 The XY Problem
安全攻防技能-安全基础概念
cybersecurity: 网络空间安全涉及旨在保护设备，网络，程序和数据免受攻击和未经授权的访问的一系列实践，流程和技术; 网络安全不仅可以保护数据，还可以保护存储数据的资源和技术。
LeetCode – Binary Tree Level Order Traversal Solution
Given a binary tree, return the _level order_ traversal of its nodes' values. (ie, from left to right, level by level). For example: Given binary tree [3,9,20…
Timers and time management in the Linux kernel. Part 7.
这篇文章 Timers and time management in the Linux kernel. Part 7
/proc/buddyinfo文件
/proc/buddyinfo 文件可以查看Linux机器上可用的内存页， 可以查看每个节点，不同区域的每个order大小的块的可用数量, 下面是我们虚拟机的信息：
LeetCode –Binary Tree Postorder Traversal
Given a binary tree, return the _postorder_ traversal of its nodes' values. Example: Input: [1,null,2,3] \\ / Output: [3,2,1] Follow up: Recursive solution…