套题:Codeforces Round #194 (Div. 1) (2/5)
A. Secrets
http://www.cnblogs.com/qscqesze/p/4528529.html
B. Chips
http://www.cnblogs.com/qscqesze/p/4528579.html
A. Secrets
http://www.cnblogs.com/qscqesze/p/4528529.html
B. Chips
http://www.cnblogs.com/qscqesze/p/4528579.html