Need help to solve the problem 213c

Правка en1, от sirish_kp, 2016-10-29 09:11:58

I'm not clear with the explanation in editorial for problem 213C. Can someone explain me clearly how to approach this problem. Thanks for your help.

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en1 Английский sirish_kp 2016-10-29 09:11:58 183 Initial revision (published)