mtry

摘要： Spinning Wheels1998 ACM NE RegionalsEach of five opaque spinning wheels has one or more wedges cut out of its edges. These wedges must be aligned quickly and correctly. Each wheel also has an alignment mark (at 0 degrees) so that the wheels can all be started in a known position. Wheels rotate in th 阅读全文

摘要： StringsobitsKim SchrijversConsider an ordered set S of strings of N (1 <= N <= 31) bits. Bits, of course, are either 0 or 1.This set of strings is interesting because it is ordered and contains all possible strings of length N that have L (1 <= L <= N) or fewer bits that are `1'.Your 阅读全文