How to solve uva live 7172

Правка en1, от inception_h, 2017-03-02 17:50:53

How to solve uva live 7172 . I am not getting any idea. Thanks in advance problem link :https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&category=633&page=show_problem&problem=5184

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en1 Английский inception_h 2017-03-02 17:50:53 239 Initial revision (published)