it can be improved vis intilaize

          size =matrix.size() ; 

outside the loop

nice shot!

This approach has a space complexity of O(n). There is a solution in O(1) though. Definitely not best practice.

🥷🏿's js trying his best to make the shortest line of code possible atp 😭🙏

Good Code.

no

is there any difference between ++i and i++ in this case?

While unneeded that is just how some of our brains think about it and it does make the code readable.

can anyone please explain how it work??

Current state of C++ initial solution setup compiles correctly, closing!

The absolute value of positive numbers and zero is that number itself, and the C++ compilers automaticly convert -0 to 0.

whats istringstream and getLine and what do they do exactly?
also whats the use of the variable Token?

you could also use a switch statement instead of those ifs

Your explanation is easy to understand. I didn't know this trick before. Thank you for clarifying it.