Leetcode/Hakerank/Codechef/Kattis problems

A good C++/Java programmer who is into competitive programming. Need around 40 problems to be done from a competitive programming website called Open Kattis. Problems are like leetcode/hackerank type. Of 40 problems you do, atleast 25 of these should be of difficulty level >=6. For every problem solve you also need to write a brief two page summary of your journey in developing the solution, like your approach to solve, lessons you learned, references to online resources, any notorious bugs that cost you long time, or some test cases you crafted that really rocked. You will be making an account on Open Kattis website so that you can run your code on all the test-cases. A problem is qualified as solved if only it passes all the test cases. I can pay per problem solved but need atleast 4-6 questions done every week.