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There is a building with N floors (numbered 1 through N from bottom to top); on each floor, there are M windows (numbered 1 through M from left to right). Let's denote the j-th window on the i-th floor by (i,j). All windows in the building need to be cleaned one by one in a specific order. You are given this order as a matrix A with N rows and M columns; for each valid i and j, the window (i,j)

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solution.cppC++17

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