摘要：
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
摘要：
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
摘要：
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