I became quite proficient in those types of interviews just by doing really small amount of exercises. No need to grind for countless hours.
If you get an async automatic test you can always google your solution easily. You need to be proficient in understanding the problem and implementing the solution from description or rewriting in it different programming language. I had few live coding sessions with "leetcode like" task. Most of they time you'll ask you to do some basic thing, where the default complexity is around O(N²) and the idea is to come up with faster solution.
Once in a while I like to experiment with different programming language and leetcode is one of the best way to do that. People advice on building real world apps when learning new stack, but I find that really dull, as you need to understand a lot more machinery in the stack before you can actually have something running. Leetcodes are easy to run and create. At the same time they force you to lookup basic constructs, learn how to work with strings, arrays, etc.
If you get an async automatic test you can always google your solution easily. You need to be proficient in understanding the problem and implementing the solution from description or rewriting in it different programming language. I had few live coding sessions with "leetcode like" task. Most of they time you'll ask you to do some basic thing, where the default complexity is around O(N²) and the idea is to come up with faster solution.
Once in a while I like to experiment with different programming language and leetcode is one of the best way to do that. People advice on building real world apps when learning new stack, but I find that really dull, as you need to understand a lot more machinery in the stack before you can actually have something running. Leetcodes are easy to run and create. At the same time they force you to lookup basic constructs, learn how to work with strings, arrays, etc.