Title: When I have been on flights recently without Wifi, I've been passing the time by doing programming problems I find online before the flight.<p>A few times now I've found myself scrambling before a flight to download some random CS course PDF or digging around recruiting sites for hiring challenges that don't assume I have an Internet connection.<p>Does anyone have a good recommendation for a big page or site full of interesting problems that I could download locally? Generally problems that take from 30min - 2hrs to complete?
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