Codeforces 888E:Maximum Subsequence(枚舉,二分)

You are given an array a consisting of n integers, and additionally an integer m. You have to choose some sequence of indices \(b_1, b_2, ..., b_k (1 ≤ b_1 < b_2 < ... < b_k ≤ n)\) in such a way that
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