need solution for problem: unique color on hackerrank

Revision en1, by dmlocdmloc, 2016-10-10 06:52:30

https://www.hackerrank.com/challenges/unique-colors does anyone know how to solve this problem??? I dont understand the problem setter's solution. thanks a lot

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en1 English dmlocdmloc 2016-10-10 06:52:30 213 Initial revision (published)