I would recommend you to read the classic books about algorithms and data structures instead (or whatever the topic is you want to learn about). In the long term it's better because:

- well, those are classic books written by people who know. You'll learn a lot of high quality material

- your future engineer peers (the good ones) will give a damm whether or not you know LeetCode puzzles inside out. They do care about you knowing the fundamentals

- LeetCode is short-term planning: bread for today hunger for tomorrow. Make your future self a BIG favour and stop doing LeetCode, and start learning from trustful sources (whatever the topic is)