Problem Solving Ideas with Its solution explanation

Job ID: 37201367

Budget: $10 – $30 USD

I'm looking for problem-solving ideas with or without solutions and it's preferable not to get the same ideas from online judges like codeforces and topcoder etc...
You might use the same idea but with some modifications.
An idea with a solution has an extra bonus.

Preferred Languages:
C++
Python

Pay Rate:
1 USD / Idea
1.5 USD / Idea (With Solution Explanation)