Problem 0 111

bayygy | 2015-05-22 18:47:41Author
555
20112840 | 2015-05-22 21:06:47# 1
666
666
minyizhixing | 2015-05-22 22:13:25# 2
????????
chenloxiaoea | 2015-05-23 12:47:16# 3
N=3为什么有4种答案?
ccutchi_wyx | 2015-05-23 17:52:54# 4
777
777