1.编程语言问题(以java为例)
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Java vs C++
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Abstract class vs interface
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pass by reference vs pass by value
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Final/Finally/Finalize
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static
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volatile
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Primitive types
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overriding vs overloading
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Public static void main(String[] args)
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Checked / unchecked exception
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Garbage collection
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JVM
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Java object class method
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Java Serialization
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Java heap/stack
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Java thread
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Java 8 vs. java7
2. 数据结构
2.0. What is Big O?
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O(1)/Constant Complexity: Constant.
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O(log n)/Logarithmic Complexity: Not as good as constant, but still pretty good.
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O(n)/Linear Complexity: The larger the data set, the time taken grows proportionately.
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O(n log n):
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O(n^2)/Quadratic Complexity:
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O(2^n): Exponential Growth!
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O(n!): Factorial
2.1.List
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ArrayList vs LinkedList
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Vector vs ArrayList
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Use Array implement ArrayList.
2.2.Set
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TreeSet VS HashSet
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HashMap vs HashSet
2.3. Map
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Collision resolution: Separate chainning/Linear Probing
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HashMap原理
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HashMap vs TreeMap
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HashMap vs Hashtable
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HashMap Vs. ConcurrentHashMap Vs. SynchronizedMap
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LinkededHashMap
2.4. Arrays
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Collections.sort()
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Arrays.sort()
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array1.equals(array2);
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Arrays.equals(array1, array2);
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Array equals vs deepEquals
2.5. Stack
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Recursion
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DFS
2.6. Queue
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First in First out
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BFS
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Deque:Arraydeque/Linkedlist
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Blockingqueue
2.7. Sort
- 比较排序: bubble sort/selection sort/insert sort (n^2)
mergesort/quicksort/heapsort (nlogn)
- 非比较排序:count sort,radix sort,bucket sort
2.8. heap
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Priority Queue
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Comparator vs Comparable
2.9.Tree
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Binary Tree
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k叉树
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B树/B+ 树
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K-d Tree
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Trie Tree
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Segment Tree
3. 算法题
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Reverse Linkedlist
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Binary Tree Upside Down
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Lowest Common Ancestor of a Binary Tree
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Happy Number
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Copy List with Random Pointer
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Binary Search in unkown size rotated array
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rand2()->rand3(); rand3()->rand5()
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Product of Array Except Self
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How to check if given four points form a square
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Topological sorting
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The idea is that you have 25 horses, a 5 lane track, no timer, and want to find the fastest 3 horses. How many races can you do it in?
4. CS fundamentals
4.1.组成原理:
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反码和补码:
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什么是cache?
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内存和硬盘
4.2.操作系统:
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线程和进程的区别
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并发和并行
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线程的生命周期
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什么是死锁?
4.3.计算机网络:
输入www.google.com会发生什么?(confluent/houzz/yahoo)
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1. TCP 三次握手,TCP/UDP 区别;
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2. http/https 区别;http request:post/get ;http port 80 ssl;
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3.Public key/Private key;
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4. HTTP 401, 403, or 404 Error
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5. Client/Server Model
4.4.软件工程以及Linux:
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Unitest
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Design pattern:Singleton/Factory
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Linux Commands: kill -9 / scp / telnet / ps/ sort/ grep/less
5. 数据库
5.1.Design a database
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员工信息管理数据库
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设计一个电商数据库
5.2.SQL知识点:
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建立表格:按需建表
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主键Primary Key
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副键Foreign Key
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数据类型Data Type
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数据类Number: Int, smallint, bigint, decimal
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字串类String: Char, varchar
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日期类Date: datetime
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Null or Not Null
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表与表之间的关系:一对多 (其他类型:一对一,多对多)
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ER图Entity Relationship Diagram
5.3.基础语句
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Select…From…基本返回语句
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Where…and…查找前后条件均符合的记录
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Subquery 子查询句
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…Inner Join…on…
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Self Join
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Group by 组合项
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Order by…DESC 降序排序
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Count(), Sum() 计数,总计(Aggregate Function并集功能,还有avg, first, last, max, min)
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Top 3 前3项记录
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Where…in () 查找符合in后条件的记录
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Union VS. Union All 去重复项合表VS.不去重复项合表
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Rank()over(order by…) 按照…排序(结合where可用于查找第几项)
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Having查找并集后的记录,即在结果中查找
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Where VS. Having 查找单一记录(在过程中查找),查找并集记录(在结果中查找)
5.4.SQL索引:
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什么是索引?
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为什么索引更快?
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何时建立索引有效?
6. OOD
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Design a chess game
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Design a Elevator system
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Design a parking lot
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Design a file system
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Design a blackjack card game
7. System design
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如何设计Uber
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如何设计netflix;
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如何设计facebook;
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如何设计whatsapp
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