Alan Zhan 部落格

Live for nothing, or die for something

白話解 Leetcode - 23 Merge k Sorted Lists

23. Merge k Sorted Lists https://leetcode.com/problems/merge-k-sorted-lists/ HardYou are given an array of k linked-lists lists, each linked-list is sorted in ascending order. Merge all the …

Posted by Alan Zhan on Saturday, June 25, 2022

白話解 Leetcode - 200 Number of Islands

200. Number of Islands https://leetcode.com/problems/number-of-islands/ MediumGiven an m x n 2D binary grid grid which represents a map of '1's (land) and '0's (water), return the number of islands. …

Posted by Alan Zhan on Thursday, June 23, 2022

白話解 Leetcode - 78 Subsets

78. Subsets https://leetcode.com/problems/subsets/ MediumGiven an integer array nums of unique elements, return all possible subsets (the power set). The solution set must not contain duplicate …

Posted by Alan Zhan on Monday, June 20, 2022

白話解 Leetcode - 111 Minimum Depth of Binary Tree

111. Minimum Depth of Binary Tree https://leetcode.com/problems/minimum-depth-of-binary-tree/ EasyGiven a binary tree, find its minimum depth. The minimum depth is the number of nodes along the …

Posted by Alan Zhan on Thursday, June 16, 2022

白話解 Leetcode - 104 Maximum Depth of Binary Tree

104. Maximum Depth of Binary Tree https://leetcode.com/problems/maximum-depth-of-binary-tree/ EasyGiven the root of a binary tree, return its maximum depth. A binary tree's maximum depth is the …

Posted by Alan Zhan on Tuesday, June 14, 2022

如何在贏者全拿的職場中生存

贏者全拿，從字面上的大家應該就會懂了，在我們生活中也時常發生，舉一個最簡單的例子：在民主社會中，每幾年就會有一次總統大選，只有獲得最高票的那個人可以勝出擔任下一任的總統，第二名與第三名好像就沒那麼重要；在情場上，每位男生都可以去追求新垣結衣，然後最終勝出的就只為有一位，在運動場上，在公司，在任何地方，大部分的場景都是贏者全拿的。

Posted by Alan Zhan on Monday, June 13, 2022

白話解 Leetcode - 226 Invert Binary Tree

226. Invert Binary Tree https://leetcode.com/problems/invert-binary-tree/ EasyGiven the root of a binary tree, invert the tree, and return its root. Example 1: Input: root = [4,2,7,1,3,6,9] …

Posted by Alan Zhan on Sunday, June 12, 2022

Kubernetes 核心介紹 Scheduler

Scheduler 嚴格算起來，算是特殊的 Controller，工作原理與其他控制器無差別。 Scheduler 的特殊職責在於監控當前集群所有未調度的 Pod，並且獲取當前集群的所有節點健康狀況和資源使用情控，為待調度的 Pod 選擇最佳節點，完成調度。

Posted by Alan Zhan on Monday, May 16, 2022

Kubernetes 核心介紹 Api Server

API Server kube-apiserver 是 Kubernetes 最重要的核心組件之一，主要提供以下功能：提供集群管理的 REST API ，包括認證、授權、數據檢驗以及集群狀態變更等認證 Authentication 授權 Authorization 准入 Admission (Mutating & Valiating) 提供其他模組之間的數據交互和通訊的樞紐，其他模組只 …

Posted by Alan Zhan on Sunday, April 24, 2022

Mongodb Index 最佳實踐

自上一篇在實際的 Porduction 發生了 sorted operation oom 的問題之後，才意識到自己對於 mongodb Index 的掌握度沒有那麼高，於是開始餵關鍵字給 google 查了好久才終於整理出一些重點，有一些重點在上一篇，可以到上一篇複習一下 MongoDB Sorted Operation OOM。

Posted by Alan Zhan on Sunday, April 10, 2022