摘要：
恢复内容开始 Given a specified total t and a list of n integers, find all distinct sums using numbers from the list that add up to t. For example, if t=4, n 阅读全文
摘要：
A ring is compose of n circles as shown in diagram. Put natural number 1, 2, ..., n into each circle separately, and the sum of numbers in two adjacen 阅读全文