Web Development Bootcamp

There is a project used in my uni to conduct small scale CP contests. The site is kinda crude and doesn't have an inbuilt editor, I want to integrate an editor (like that of leetcode), I was thinking of Monaco library but I think it's a bit too expansive for my usecase, what else can I use? Requirements: No LSP. Tree sitter integation (hopefully) for c, cpp, java, python, ts. For now this is all.