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DescriptionAmr loves Geometry. One day he came up with a very interesting problem.Amr has a circle of radiusrand center in point(x, y). He wants the c... 阅读全文
摘要:
DescriptionA palindrome is a symmetrical string, that is, a string read identically from left to right as well as from right to left. You are to write... 阅读全文
摘要:
DescriptionIt is well known that a human gene can be considered as a sequence, consisting of four nucleotides, which are simply denoted by four letter... 阅读全文