It’s very easy to treat LC grinding as a numbers game, but repetition of high quality / frequent problems is key.
-- Anonymous LeetCode user (see What is a better method to learn LeetCode than just practicing it?)
This is a collection of C# solutions to LeetCode problems. They are generally based on Java solutions found on the LeetCode discussion boards, where a lot of smart people post creative and elegant code. The idea is to collect efficient model solutions that are short (though not golf short), so they can be easily written and explained on the whiteboard during an interview.
For more about model LeetCode solutions, see A Project for 2021.