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遇到了一个题： Description: Goldbach's conjecture is one of the oldest and best-known unsolved problems in number theory and all of mathematics. It states: E 阅读全文
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题目描述 There are N boxes arranged in a circle. The i-th box contains Ai stones. Determine whether it is possible to remove all the stones from the boxes 阅读全文
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题目描述 There are N squares aligned in a row. The i-th square from the left contains an integer ai. Initially, all the squares are white. Snuke will perf 阅读全文
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题目描述 You are given an integer sequence x of length N. Determine if there exists an integer sequence a that satisfies all of the following conditions, 阅读全文
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题目描述 One day, Snuke was given a permutation of length N, a1,a2,…,aN, from his friend. Find the following: Constraints 1≤N≤200,000 (a1,a2,…,aN) is a pe 阅读全文
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题目描述 Snuke is interested in strings that satisfy the following conditions: The length of the string is at least N. The first N characters equal to the 阅读全文
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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