If you are stuck on a LeetCode problem, there are several things you can try:
First, make sure you understand the problem statement and the constraints on the input. If you're not sure what the problem is asking for, try re-reading the statement and asking yourself clarifying questions.
Once you understand the problem, try coming up with a brute-force solution. This means finding a solution that may not be the most efficient, but that will definitely work. This can help you get a better sense of what the problem is asking for, and it can also give you a starting point for optimizing your solution.
After you have a brute-force solution, try to think of ways to make it more efficient. This might mean reducing the time complexity of your algorithm, or reducing the space complexity (the amount of memory it uses). There are many techniques you can use to optimize your solution, such as using faster data structures, using smarter algorithms, or using mathematical tricks to reduce the number of calculations.
If you're still stuck, try looking at the problem's hints or solutions. LeetCode often provides hints and/or solutions for each problem, and these can be a great way to get unstuck. Just be careful not to copy the solution verbatim – you won't learn anything that way! Instead, try to understand the solution and use it as a starting point for coming up with your own solution.
If you're still having trouble, try asking for help. You can post your question on forums like Stack Overflow or Reddit, where other programmers might be able to give you some advice. Just be sure to include details about what you've tried so far, and what problems you're still having.
I hope this will help you to solve Leetcode probelms effectively.