Using HackerRank.com, you are being asked to write code. At the same time, you are talking on the phone with the interviewer. You'll see questions on the left side, and as you select text, write code, etc., your interviewer sees your actions in real-time. The interviewer wasn't as concerned about the code being ready to run but was more interested in seeing your algorithm solution.

Merge two sorted arrays into the second array. Both arrays have N elements, but the second array's size is N * 2. So, merge both arrays into the second array in a sorted way.

Find if given text has matching opening and closing brackets: [, {, (. For example, ({[]}) is valid, and ({)} is invalid. They should open and close in the proper order.