西西&&C的专栏

02-3. Pop Sequence (25)Given a stack which can keep M numbers at most. Push N numbers in the order of 1, 2, 3, ..., N and pop randomly. You are supposed to tell if a given sequence of numbers is a

Given a tree, you are supposed to list all the leaves in the order of top down, and left to right.Input Specification:Each input file contains one test case. For each case, the first line give