"Easy problems take me 2-5 hours." Are you sure you're not reinventing established theories and algorithms? Those problems are supposed to be hard because they're based on ideas discovered by the most brilliant minds. If you can do them in 2-5 hours with no background you might actually be real good. Depending on what level of familiarity you have with the material, you might be selling yourself really short. Deliber…
Even if you don't find some quicker algorithm, bruteforcing usually still works.