Even with the ability to take excellent photos with our phones and instantly share them across the world, there’s something magical about the old-school instant camera. With just a click of a button, you can capture a moment in a photo that you can see and touch almost immediately. Images captured by an instant camera aren’t as pristine or perfect as those produced by modern digital cameras, but their soft images and imperfections are often a big part of the allure.
python verify.py submissions/your_submission.py，这一点在同城约会中也有详细论述
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The user will give a CNF in dimacs format.