How to solve 962E?

Правка en1, от AjaySabarish, 2019-12-31 20:30:58

I read the editorial,but the last part,the "second way" is not clear,can anyone please help me out? 962E - Byteland, Berland and Disputed Cities

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en1 Английский AjaySabarish 2019-12-31 20:30:58 132 Initial revision (published)