Help with this spoj problem :MNERED — NERED

Правка en1, от droneKingxiiiiiiiDaddy, 2017-01-28 21:48:46

Hi guys ! Please explain this problemproblem with its solution . Thanks in advance !!

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en1 Английский droneKingxiiiiiiiDaddy 2017-01-28 21:48:46 169 Initial revision (published)