A good book with algorithmic puzzles with solutions (not of kind "how to pass and IT interview")

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can you please advise me a book with algorithmic and mathematical (IT-oriented) puzzles. But I want not one more book of kind "How to pass an interview in Microsoft / Google / any other big company" but a book specifically on algorithmic puzzles with solutions, so I could resolve one and look for a ready solution to compare effectiveness both. More pure math than IT-business if you see what I mean.