在盘中放着n 根火柴，A 和B 两人轮流从盘中取火柴，规定每次可取一根、二根或三 根，不可不取也不可多取，谁拿走最后一根便算谁输。-In intraday placed n a match, A and B both take turns matches the disc, each time a predetermined desirable one, two or three Root, can not take and do not take on more, who took