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F. Coffee Varieties time limit per test1 second memory limit per test256 megabytes This is the easy version of the problem. You can find the hard vers 阅读全文
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E. Prefix Enlightenment time limit per test3 seconds memory limit per test256 megabytes There are n lamps on a line, numbered from 1 to n. Each one ha 阅读全文
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D. Irreducible Anagrams time limit per test2 seconds memory limit per test256 megabytes Let's call two strings s and t anagrams of each other if it is 阅读全文
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C. Mind Control time limit per test1 second memory limit per test256 megabytes You and your n−1 friends have found an array of integers a1,a2,…,an. Yo 阅读全文
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B. Array Sharpening time limit per test1 second memory limit per test256 megabytes You're given an array a1,…,an of n non negative integers. Let's cal 阅读全文
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A. Even But Not Even time limit per test1 second memory limit per test256 megabytes Let's define a number ebne (even but not even) if and only if its 阅读全文