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No matter how my college is, I still have respect for our DSA teacher from sem3. Instead of some written assignments, she told us to solve 10 linked list ques on leetcode or codechef and submit her the profile link. That was my first time actually using leetcode.

The summer break comes to an end. Progress: - learned js - reached 195 ques on leetcode - won a hackathon - secured intern for 2026 - explored communities on x and dc (was clueless about them before) - negligible gaming and insta usage

Started using X properly exactly a month ago. Got 50 followers today😋 tysm guys🎀

the three terms encoding, encryption and hashing sounds pretty similar but they are used for completely different purposes. Encoding it is not about security at all. encoding is simply data representation, changing data from one format to another so that it can be easily transmitted or understood by another system. - it uses public algos that anyone can access - there is no secret key and its fully reversible - the main goal is usability and not secrecy eg - when you see a website url like : `https://www .google.com/search?q=hello%20world`, the space in "hello world" is encoded as %20. common encoding formats are: url encoding, ascii, unicode. Encryption - encryption involves security. in encryption, the readable data, i.e plain text, is converted into unreadable, i.e cipher text, using an encryption key. - only someone with the right key can decrypt it back to the original data. - it used for secure online transactions, encryption of files and msges. there are two main types: > symmetric encryption - same key for encryption and decryption (AES ) > asymmetric encryption - there are two keys, public and private ( RSA ) eg- when you send a msg on whatsapp, your msg is encrypted on your device, before it is sent. it can only be decrypted on your friend’s phone. Hashing hashing is a one way process used to check if the data has been altered. it is used for data integrity verification. - hashing transforms the input data of any size into a fixed length unique string i.e a hash. - once the data is hashed, the original input cannot be retrieved. - even a small change in input changes the hash output completely. eg - when you create an account and set a password, websites don't store your actual password. instead, they store the hash of it. when you log in it, the entered password is hashed again and if both hashes match, you are logged in.

observed a pattern here, many people start to leave x or get drained after a span of 3-4 months and then a new batch appears. most of the accounts, which started when i was new too, have disappeared now. even my 2 og friends from here were gone last month🥀

been learning some backend stuff lately, so wrote a brief about access and refresh tokens in jwt. what is jwt? JWT ( JSON Web Token ) is a compact, url-safe way to securely transmit information between parties as a json object. it's commonly used for authentication and information exchange in web applications. in jwt based authentication, access tokens and refresh tokens work together to manage user sessions securely. Access Tokens - an access token is a credential used to access protected resources on user's behalf. - it has a short lifespan ( few mins to hrs ) to reduce security risks. - access tokens are usually stored in memory ( non persistent storage ) to reduce security risks. - it contains info like the user's identity and permissions. - once it expires, the client must obtain a new access to continue accessing resources. Refresh Tokens - a refresh token allows the client to obtain a new access token when the current one expires. - it has a long lifespan, so should be stored securely, typically in an HttpOnly cookie. - HttpOnly cookies protect the token from being accessed by js, reducing the risk of XSS ( cross-site scripting ) attacks. - refresh tokens can be invalidated to log a user out or revoke their access when needed. below is how they work together : 1) User login - user enters their credentials ( username and pwd ). - server verifies them, issues access token and refresh token. 2) Application load - on load, the client checks if a valid access token exists in memory. - if none exists or it has expired, the client sends the refresh token to the server. - if the refresh token is valid, server issues a new access token. 3) Accessing resources - client sends the access token with requests via the `Authorization` header: Authorization : Bearer - server verifies the token and grants the access to protected resources. 4) Token expiry and refresh - when access token expires, requests will fail with an unauthorized error. - client sends the refresh token to server to get a new access token, which is then issued after validation. 5) Logout - if the refresh token in invalid or expired, the user is logged out. using access and refresh tokens this way keeps sessions secure and easy for the user. thanks for reading : )

Last day as my teenage self

studied a topic from him for the first time for exams. he teaches so calmly, easily and beautifully. now i want to binge watch all topics again from him😭

Looks prettyy

when I was new on X everyone looked so cool nd overwhelming to me, the type of people i would manifest to know. but now most of them are my friends, everything and everyone is so different and nice than it looked in the beginning. really found some very nice peeps here...(1/2)

Topological sort ( graphs ) In Topological sort of a Directed Acyclic Graph (DAG), the nodes are arranged in a sequence such that if there is an edge between nodes 'u' and 'v' which goes like u-->v, then 'u' should always appear before 'v' in the sequence. It is only valid for directed acyclic graphs (DAG) as : - for undirected graphs : u-->v and v-->u, the edges are bidirectional, so ordering breaks. - for cyclic graphs : eg 1-->2-->3-->1, it's not possible to represent each node before the other. There are two approaches to find the topo sort of a DAG: 1) DFS based - perform DFS on the graph - after visiting all neighbors of a node, push that node into a stack. - it the end after all nodes are visited, start popping from the stack, that will give the topo sort. 2) BFS based ( Kahn's Algo ) - compute the in-degree (number of incoming edges) for all nodes. - push all the nodes with indegree 0 into the queue. - repeatedly pop from the queue, add to topo order, and reduce in-degree of its neighbors. ( if any neighbor’s in-degree becomes 0 then push it into the queue ) Both approaches take time complexity of O( V + E ) where : V : no. of vertices E : no. of edges

totally unplanned. how delhiites meet at random metro interchanges 😭

I tried to balance both dsa and dev this month.

i have more bangers on reddit than here on x

Gm from the metro guys 😇

Started using X properly exactly a month ago. Got 50 followers today😋 tysm guys🎀

10th : 98.4 11th : 92 12th : 95 JEE : 90.5 🥀🥀🥀 Sem1 : 9.12 Sem2 : 9.24 Sem3 : 9.69 Sem4 : 9.69

buying a laptop is so fckking confusing, just tell me which laptop y'all have rn 🥀

Do introverts like me don't deserve a seat in metro ? Logo ko shift hokr baithne ke liye kaise bolte hain, guide me plssss

What oomf am I? 1. friend oomf 2. intimidating oomf 3. interesting oomf 4. cute oomf 5. crush oomf 6. oomf I’d interact more with 7. famous oomf 8. funny oomf 9. flirty oomf 10. favourite oomf 11. loud oomf 12. someone i wanna talk to more 13. non-oomf 14. intelligent oomf

unfollowed few inactive accounts today

meri tl mai koi single kyu nhi hai, subah se 10 soft launch dekh liye 😭

Do you guys have irl friend to whom you can yap 24x7 anytime without any filters?

when I was new on X everyone looked so cool nd overwhelming to me, the type of people i would manifest to know. but now most of them are my friends, everything and everyone is so different and nice than it looked in the beginning. really found some very nice peeps here...(1/2)

can i pls know this for me 🥀

thanks 800 peeps :)

observed a pattern here, many people start to leave x or get drained after a span of 3-4 months and then a new batch appears. most of the accounts, which started when i was new too, have disappeared now. even my 2 og friends from here were gone last month🥀

Looks prettyy

The summer break comes to an end. Progress: - learned js - reached 195 ques on leetcode - won a hackathon - secured intern for 2026 - explored communities on x and dc (was clueless about them before) - negligible gaming and insta usage

i have more bangers on reddit than here on x