Google APAC 2017 round A problem B Rain

Revision en2, by spontaneously, 2016-07-10 12:08:44

Problem

I used dfs but I'm getting incorrect answer. here's my code

Tags apac 2017, google apac, apactest 217

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  Rev. Lang. By When Δ Comment
en2 English spontaneously 2016-07-10 12:08:44 2210
en1 English spontaneously 2016-07-10 11:39:25 2407 Initial revision (published)