Hi all,
I am wondering how I can use Leetcode effectively. I am working and looking forward to increasing my coding skills for better opportunities through leetcode problem solving. But most of the time, I am overwhelmed by the total number of questions.

Could you suggest me how many problems I shall do everyday to improve my coding skills? Sometimes it gets depressing, as for today, I worked for 3 hours to solve longest increasing subsequence, starting from suboptimal to optimal solution. I guess, an eternity is needed to solve all problems mentioned in leetcode and get ready for a technical interview.
Therefore, I am seeking for your suggestion. Thank you!