Crowded Matrix

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Bob has a $N\times M$ matrix $A$ that consists of digits from $0$ to $9$. Bob considers a matrix crowded if it contains more than $K$ distinct digits. Consider all the sub-matrices that contain the top-left element of $A$ (i.e., $A_{1,1}$). Among all such sub-matrices, find the number of crowded sub-matrices. NOTE: the original matrix is also considered as a sub-matrix. ### Input: - The f

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solution.cppC++17

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