korea 2009(3)

For discussing Olympiad Level Combinatorics problems
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protik
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Joined:Wed Dec 08, 2010 7:21 am
korea 2009(3)

Unread post by protik » Wed Sep 05, 2012 5:41 pm

2008 white stones and 1 black stone are in a row. An 'action' means the following: select one black stone and change the color of neighboring stone(s).
Find all possible initial position of the black stone, to make all stones black by finite actions.
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