Number of Paths in a Grid

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While learning simple DP problems, Ira came across this simple problem. Given a grid in two dimensions having N rows and M columns, how many paths exist from top-left cell of the grid to bottom-right cell when allowed movements in one step are one cell from left to right or one cell top to bottom only? Formally, a cell of the given grid G in the ith row and j th column is represented as G(i, j)

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solution.cppC++17

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