Binary Search way to do this?

Правка en1, от jhjfbsbfkbjfnfnfjfj, 2020-04-22 11:30:13

How can I implement this question using binary search? https://codeforces.me/contest/1177/problem/B

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en1 Английский jhjfbsbfkbjfnfnfjfj 2020-04-22 11:30:13 130 Initial revision (published)