摘要： DescriptionThe world financial crisis is quite a subject. Some people are more relaxed while others are quite anxious. John is one of them. He is very... 阅读全文

摘要： DescriptionLetxandybe two strings over some finite alphabetA. We would like to transformxintoyallowing only operations given below:Deletion:a letter i... 阅读全文

摘要： Description一组研究人员正在设计一项实验，以测试猴子的智商。他们将挂香蕉在建筑物的屋顶，同时，提供一些砖块给这些猴子。如果猴子足够聪明，它应当能够通过合理的放置一些砖块建立一个塔，并爬上去吃他们最喜欢的香蕉。研究人员有n种类型的砖块，每种类型的砖块都有无限个。第i块砖块的长宽高分别用xi，... 阅读全文