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Description The SUM problem can be formulated as follows: given four lists A, B, C, D of integer values, compute how many quadruplet (a, b, c, d ) ∈ A 阅读全文
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Description Simon is doing a physics experiment with N identical balls with the same radius of R centimeters. Before the experiment, all N balls are f 阅读全文
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Description Jessica's a very lovely girl wooed by lots of boys. Recently she has a problem. The final exam is coming, yet she has spent little time on 阅读全文