This is a combination with a number of my answers and my thoughts to these LeetCode problems. It is my pleasure to refer to it for every reader.
Every .py or .cpp file is an answer to one LeetCode problem and combines a main() function. For .py, you can run it directly. As for .cpp, you need to add it to Visual Studio Project or write a CmakeLists.txt or Makefile for it.
The name of every .py or .cpp file coincides with that in Leetcode. You can search the name in Leetcode and see the introductions or requirements about the problem.