import math def LatticePath(down, right): if(down == 0 or right == 0): return 1 else: return LatticePath(down -1, right) + LatticePath(down, right -1) def LatticePath_v2(down, right): numPaths = 0 return math.factorial(down + right) / (math.factorial(down)**2) print LatticePath(3,3) print LatticePath_v2(20,20)
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