Make Matrix Empty

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An $N X N$ square matrix containing randomly arranged numbers ranging from $0$ to $K$ are given (numbers may repeat). The matrix can be made as empty as possible using one of the following rules at each step. a) A consecutive sequence of duplicate numbers can be removed along vertical line or horizontal line. b) A number can move to neighboring left or right or top or bottom empty position. Here

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solution.cppC++17

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