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Background Before Albanian people could bear with the freedom of speech (this story is fully described in the problem “Freedom of speech”), another freedom - the freedom of choice - came down on them.
DescriptionThe little cat is majoring in physics in the capital of Byterland. A piece of sad news comes to him these days: his mother is getting ill. Being worried about spending so much on railway ti
它们按照字符串的大小排序： 07JSOI 7JSOI0 I07JSO JSOI07 OI07JS SO...
DescriptionA musical melody is represented as a sequence of N (1<=N<=20000)notes that are integers in the range 1..88, each representing a key on the piano. It is unfortunate but true that th...
DescriptionYou are given a number of case-sensitive strings of alphabetic characters, find the largest string X, such that either X, or its inverse can be found as a substring of any of the given s...
DescriptionYou may have wondered why most extraterrestrial life forms resemble humans, differing by superficial traits se like. A few bear no h...
DescriptionFarmer John has noticed that the quality of milk given by his cows varies from day to day. On further investigation, he discovered that although he can't predict the quality of milk from...
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