srgrr/JutgeContests ? reverse-engineered prompt

Build me a clean repository for my UPC Jutge contest solutions. I want it to be a simple place to store one C++ solution per problem, with the problem number in the filename and a short note in the README saying these are solutions for some Jutge programming contest problems.

Please keep it tidy and practical, with a basic gitignore and a structure that makes it easy to add more solutions later. If there are any obvious backup or duplicate files, clean those up too. I do not need a fancy app, just a well organized code collection that compiles smoothly and is easy to browse.

Use the existing problem files as the main content, keep the style consistent, and make sure the repository looks like a real personal contest archive. If you need to check anything about current Jutge problem info or C++ compatibility, look it up online.