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题目描述 Snuke got an integer sequence of length N from his mother, as a birthday present. The i-th (1≦i≦N) element of the sequence is ai. The elements ar 阅读全文
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题目描述 Snuke lives on an infinite two-dimensional plane. He is going on an N-day trip. At the beginning of Day 1, he is at home. His plan is described i 阅读全文
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题目描述 Welcome to the 2017 ACM-ICPC Asia Nanning Regional Contest. Here is a breaking news. Now you have a chance to meet alone with the Asia Director t 阅读全文