All Letter Subgrid Count I

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You are given a grid of letters. Your task is to calculate the number of square subgrids that contain all the letters. Input The first line has two integers n and k: the size of the grid and the number of letters. The letters are the first k uppercase letters. After this, there are n lines that describe the grid. Each line has n letters. Output Print the number of subgrids. Constraints - 1

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solution.cppC++17

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