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<oerjan> learn Postorder is the same as Polish notation, since Post was Polish. Not to be confused with reverse Polish notation.
author | HackBot |
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date | Wed, 24 Feb 2016 05:00:04 +0000 |
parents | 9bf80fcf858b |
children |
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#!/usr/bin/python s=set() try: while True: l=raw_input() if l not in s: s.add(l) print(l) except EOFError: pass