LeetCode Solutions

2022-06-23 14:28:42 https://vovopap.com/2022/02/06/my-FAANG-interview-experience-four-onsite-interviews-almost-four-offers.html Ochish/sharhlash

2022-06-23 11:17:49 Hypertext Transfer Protocol Secure (HTTPS) is an extension of the Hypertext Transfer Protocol (HTTP.) HTTPS transmits encrypted data using Transport Layer Security (TLS.) If the data is hijacked online, all the hijacker gets is binary code. 

How is the data encrypted and decrypted?

Step 1 - The client (browser) and the server establish a TCP connection.

Step 2 - The client sends a “client hello” to the server. The message contains a set of necessary encryption algorithms (cipher suites) and the latest TLS version it can support. The server responds with a “server hello” so the browser knows whether it can support the algorithms and TLS version.

The server then sends the SSL certificate to the client. The certificate contains the public key, hostname, expiry dates, etc. The client validates the certificate. 

Step 3 - After validating the SSL certificate, the client generates a session key and encrypts it using the public key. The server receives the encrypted session key and decrypts it with the private key. 

Step 4 - Now that both the client and the server hold the same session key (symmetric encryption), the encrypted data is transmitted in a secure bi-directional channel.

Why does HTTPS switch to symmetric encryption during data transmission? There are two main reasons:

1. Security: The asymmetric encryption goes only one way. This means that if the server tries to send the encrypted data back to the client, anyone can decrypt the data using the public key.

2. Server resources: The asymmetric encryption adds quite a lot of mathematical overhead. It is not suitable for data transmissions in long sessions.

Author is Alex Xu Ochish/sharhlash

2022-06-23 08:57:15 Alex Xu for system design & book-writing tips | Author of System Design Interview Series


What is so important about HTTPS that, these days, most websites require it? How does HTTPS work? We will answer these questions in tomorrow’s video. Subscribe to our YouTube channel so you won’t miss it ⇩: YouTube: https://bit.ly/3xWM7Kk Ochish/sharhlash

2022-06-19 14:38:29 https://hackernoon.com/14-patterns-to-ace-any-coding-interview-question-c5bb3357f6ed Ochish/sharhlash

2022-06-14 10:31:24 https://docs.outtalent.com/
https://interviews.school/ Ochish/sharhlash

2022-06-14 10:00:02 My Solution: Java

#94. Binary Tree Inorder Traversal

Type: Easy
Topic Related: Stack, Tree, DFS, Binary Tree
Run Time: 1 ms, faster than 44.33%
Memory Usage: 42 MB, less than 61.49% Ochish/sharhlash

2022-06-14 08:35:07 Depth-first Traversals:
1. Inorder(Left, Node, Right)
2. PreOrder(Node, Left, Right)
3. PostOrder(Left, Right, Node)

LeetCode Problem to solve Ochish/sharhlash

2022-06-14 07:26:21 My Solution: Java

#20. Valid Parentheses

Type: Easy
Topic Related: String, Stack
Run Time: 2ms, faster than 85.84%
Memory Usage: 42.3MB, less than 29.54% Ochish/sharhlash

2022-06-13 12:01:55 Design Pattern Book in detail! Ochish/sharhlash

2022-06-11 18:26:57 Kecha Twitterda bir ajoyib postga ko’zim tushib qoldi, 6 yil production tajribasiga ega injinerga o’rtacha $500K-$800K(yiliga) taklif qilishayotgan ekan AQSHda. Eng qizig’i bu odam o’zini $530K lik yillik maoshi bilan boshqa kompaniyalardan interviewdan o’tgan. ($500 ming karl )

Ha, bu summani qanchadiri haqiqiy pul ko’rinishida, qolgani aksiya, bonus va boshqacha ko’rinishlarda bo’lishi mumkin, lekin juda hayratlanarli raqamlar.

Endi so’rashilar mumkin, “Nuruddin aka, Biz qanday qilib bu darajaga erishishimiz mumkin?” deb, quyida shu odamdan yetarlicha ma’lumotga ega intervyularga tayyorlanish strategiyasi:

https://www.teamblind.com/post/7-onsites-7-offers-aAFTykAD

@nuruddinblogs Ochish/sharhlash