摘要： Javabeans are delicious. Javaman likes to eat javabeans very much. Javaman has n boxes of javabeans. There are exactly i javabeans in the i-th box (i  阅读全文

摘要： The successor to a string can be calculated by applying the following rules: Ignore the nonalphanumerics unless there are no alphanumerics, in this ca 阅读全文

摘要： The conic sections are the nondegenerate curves generated by the intersections of a plane with one or two nappes of a cone. For a plane perpendicular 阅读全文