I had to finish an online coding challenge first, it was from hackerrank. There were two coding questions. One of them is about valid parentheses. You need to finish coding these two questions within an hour.

I was asked to do an Online Coding (Hacker Rank) test which comprised of two problems. It was quite okay if you know basics very well. Precisely, you have to complete a function given and not worry about the main because it is being disabled.