Leetcode Problems

This page includes my solved leetcode problems categorized based on subject. For premium problems (which I mentioned in the last column called note), because the link for the problem is restricted to the premium leetcode users, I have included the description of the problem at the end of the embedded file. 
Note: These are my selected leetcode problems which I fully understood and analyzed. For the problems which the python file is bold and they are on top of unbold files (i.e. Python vs Python), I have transferred my code to my github account and the link is available. For the rest of the problems, I am in the process of transferring my files. Thank you very much for your patience.