I have been practicing on leetcode for 2-3 months (not regular though). I have 6 YOE and targetting FAANG companies.
The thing which worries me most is. - Most of the guys practice and give their interviews in either C++ or Python or java.

Since a lot of common data structures are readily available in these language, the coding (LOC) is pretty less and we dont have to bother much. That's not the case with C. Even for hashtable implementation (which is very common) I need to write lot of code (which might take time in actual interview).

I have most of my experience working with C and partially in c++. Is it worth investing in STL and try practicing in C++ or should I focus on improving my algorithm and data structures.

Please share your thoughts and any interview experience in C if you have any.