I have around 10 YOE in programming.
Iam looking for an oppurtunity in a faang company.
I got my resumes selected by different companies and interviews are getting scheduled.
But the problem is iam confused how to prepare.

I have tried solving problems in leetcode.
Iam able to solve Easy problems.
But for Medium, some iam able to but some i have no idea how to proceed.
iam able to solve problems on maps, graphs and so on.
But for something like below that need a different strategy i couldn't figure it out.
The solutions i tried with maps or something else is complex and i end up looking at solution.
For eg: Sum of Subarray minimum, Search Suggestion Systems
https://leetcode.com/problems/sum-of-subarray-minimums/
https://leetcode.com/problems/search-suggestions-system/

When I go through the solution, i can find something new like a Trie data structure, two pointer strategy and so on.
But once iam able to find a solution, iam able to solve other similar questions.
Is it like that for you as well?
Do I have to go through any advanced ds tutorials so that I can know the strategy just by reading the question?
How many questions do I have to solve so that i will get an understanding of all the basic strategies in such questions?

Thank you so much for reading this long post.
Any help appreciated.