Merikanto

Reference:

Why does the order of the loops affect performance when iterating over a 2D array?

What is a “cache-friendly” code?

Memory part 5: What programmers can do

Think of a bus as the electronic highway on which data travels within a computer, from one component to another. This bus connects the CPU to the main memory (RAM) on the motherboard.

目前很多的汇编语言教材大多都是上来先讲一大堆CPU、总线、寄存器、标志位 … 再讲汇编语言程序设计。这种字典式的编写方法对入门是很不利的，因为在不知道这些东西都是用来干什么的情况下，全部记忆往往很难。然而这些概念在编程中还不得不用到，于是又得重新往前翻书，这就陷入了一个循环。

实际上，汇编语言的学习完全可以和高级语言一样。只不过因为汇编语言是根据CPU的工作原理进行操作，所以一切代码都要从CPU和内存的角度考虑问题。理解了指令在内存层面的执行过程，编程就水到渠成了。

Design a URL shortener, like bit.ly.

Step 1 is to scope the project. System design questions like this are usually intentionally left open-ended, so you have to ask some questions and make some decisions about exactly what you’re building to get on the same page as your interviewer.

LC 链表经典题目总结，此篇包含五题：

• 021 - Merge 2 Sorted Lists
• 083 - Remove Duplicates from Sorted List
• 206 - Reverse Linked List
• 234 - Palindrome Linked List
• 141 - Linked List Cycle

今天来总结一下树和图的解题套路。此篇包括：

• 构造树
• 树的遍历 （递归 & 迭代）
• 网格遍历
• 并查集 (Union Find)
• 递归
• 回溯 （治理分支污染）

Java 常用操作的总结，主要用作个人备忘录，以后视情况会更新。

Database normalization is the process of structuring a relational database in accordance with a series of so-called normal forms in order to reduce data redundancy and improve data integrity.

Reference: Normalization & Denormalization

Key Concepts:

• Message passing & shared memory
• Processes & threads
• Time slicing
• Race conditions

Reference:

System Design Cheatsheet