SPOJ problem PICAD

Правка en1, от speedster, 2015-06-16 18:15:02

I have been trying to solve This problem unable to do it i looked at the solution but can't understand how this why is taking a factor of 2 helping ?

Теги spoj, nobody reads tags

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en1 Английский speedster 2015-06-16 18:15:02 276 Initial revision (published)