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E. Beautiful Subarrays 题目连接： http://www.codeforces.com/contest/665/problem/E Description One day, ZS the Coder wrote down an array of integers a with 阅读全文
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D. Simple Subset 题目连接： http://www.codeforces.com/contest/665/problem/D Description A tuple of positive integers {x1, x2, ..., xk} is called simple if 阅读全文
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C. Simple Strings 题目连接： http://www.codeforces.com/contest/665/problem/C Description zscoder loves simple strings! A string t is called simple if every 阅读全文
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B. Shopping 题目连接： http://www.codeforces.com/contest/665/problem/B Description Ayush is a cashier at the shopping center. Recently his department has s 阅读全文
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A. Buses Between Cities 题目连接： http://www.codeforces.com/contest/665/problem/A Description Buses run between the cities A and B, the first one is at 05 阅读全文