Chef Likes Good Sequences

CodeChefRating 2017Open on judge ↗

Chef calls a sequence *good* if it does not contain any two adjacent identical elements. Initially, Chef has a sequence $a_1, a_2, \ldots, a_N$. He likes to change the sequence every now and then. You should process $Q$ queries. In each query, Chef chooses an index $x$ and changes the $x$-th element of the sequence to $y$. After each query, can you find the length of the longest good **subseque

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solution.cppC++17

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