problem A ICPC Kanpur Site 2006

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problem A ICPC Kanpur Site 2006

Post by skinnyguy »

you can see the problem description here... ... php?p=3764

no one solved the problem during the contest time and the problem was used again by the kanpur site for there online preliminary this year.
i can't seem to think of framing this in any form of graph theoretic algorithms.
i wanted to know if this problem needs some kind of backtracking or there exists some algorithm for solving it?

please help

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