Please help me to understand binary raise used in this problem .

Revision en2, by 3_Problems_Everyday, 2016-05-24 18:42:25

Hello everyone ! I am trying to solve this problem.I didn't understand the editorial properly. Please help me to understand the binary raise used in the editorial. Because i am new to this concept, provide me some tutorial to learn it.Thanks :)

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en2 English 3_Problems_Everyday 2016-05-24 18:42:25 0 (published)
en1 English 3_Problems_Everyday 2016-05-24 18:32:05 359 Initial revision (saved to drafts)