NOI2001（All solved）

• chain http://ideone.com/n2lzi
• cannon http://ideone.com/F9P8U
• arctan http://ideone.com/suQCI
• clever http://ideone.com/ds1bE
• equation http://ideone.com/HKhw4
• secert http://ideone.com/dCjnf

NOI2002（All solved）

• galaxy http://ideone.com/vUQEP
• dragon http://ideone.com/ZiBw2
• robot http://ideone.com/1S4nb
• savage http://ideone.com/EGm5x

NOI2003

• hookey http://ideone.com/V2Bwo
• game http://ideone.com/Iyi5p
• editor http://ideone.com/Uot3R

NOI2004（All solved）

• manhattan http://ideone.com/ES9xo
• hut http://ideone.com/PvjZW
• rainfall http://ideone.com/w37Ya
• cashier http://ideone.com/wBIO8

NOI2005

• sequence http://ideone.com/2glHa
• adv1900 http://ideone.com/KsOAm
• lemon http://ideone.com/wWjvO
• cchkk http://ideone.com/5gv67

NOI2006

• profit http://ideone.com/TnlRS
• bag http://ideone.com/ocMqB

NOI2007

• network http://ideone.com/swAoc
• necklace http://ideone.com/ah1Fc
• cash http://ideone.com/KKrBm

NOI2008

• party http://ideone.com/0NrSY
• employee http://ideone.com/7i9K9

NOI2009

• poetg http://ideone.com/t4R90
• ball http://ideone.com/n4gvn
• pvz http://ideone.com/lgBfh
• transfrom http://ideone.com/Wa8IZ

NOI2010

• plane http://ideone.com/4Il3k
• altitude http://ideone.com/Ymr2J
• piano http://ideone.com/cy5aO
• energy http://ideone.com/H4pUn

NOI2011

（聪明的读者一看就知道这明明是11年 >_,<）