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http://www.iypt.org/Tournaments. http://archive.iypt.org/solutions/. http://ilyam.org/proc1998/08_Trick_Poland_Pawel_Nowak_155-157_Proc_IYPT_1998.pdf. http://www.guokr.com/post/515464/.
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http://www.iypt.org/Tournaments http://archive.iypt.org/solutions/ • http://ilyam.org/proc1998/08_Trick_Poland_Pawel_Nowak_155-157_Proc_IYPT_1998.pdf http://www.guokr.com/post/515464/