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Solving your own problems is exactly the rush. And it can't be something that someone told you would be a good problem for practicing programming. It has to be something where you want to have the result and are eager to get closer and closer step by step.
For example I wrote bots to automatically fill out various HTML forms, or modded games, built websites for gaming clans, processed and synced subtitles for downloaded movies, scraped websites like the parliamentary election result website to slice and dice the data myself, to process Wikipedia dumps in various ways etc. Nobody told me to do any of these, but such things led me through lots of classic CS topics and I read up on how to do them with a goal in mind. That's so much better than the prof dropping some artificial problem on you.
Like if I have two subtitles in two languages and one is properly synced up, but the other isn't, but might also not correspond to the first subtitle perfectly one-to-one, then how do I find out a plausible correct alignment? This leads to various algorithms like edit distance, longest common subsequence etc.
But this presupposes that you have such computational or automation use cases in your life. For example today with Netflix existing, I might have never learned about video file formats, subtitle file formats, never had to correct audio or subtitle sync issues. If my parents had been rich and Steam existed, I wouldn't have had to learn how to play with the Windows registry, to mess with the Program Files, to understand how to use firewalls to set up LAN games etc. And all such endeavors open up new problems to solve, now you have to install an IDE, figure out environment variables, understamd that vague C++ compiler error, read up on what the words mean, all still with the goal that you want to get that thing working, but without any external pressure like deadlines, so if I want, I can take a side quest into deep diving into graph algorithms for a few days or whatever.
If you don't see such problems around you, if you don't care to customize stuff on your computer, you may look at project ideas but those always seem artificial because someone already did them and we know there is a solution. It's a schoolish problem. When you build something for yourself, you have to define the problem, the scope, then go further and further. Some riddle websites are also cool, like http://www.pythonchallenge.com/
I'm not saying that such self study is sufficient but it made my formal studies much easier because I could tie the concepts to first hand experiences.
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