Parenthesis

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The captain of TITANIC is a mathematics freak. He has recently been given a problem that he is unable to solve. And he has asked your help to solve it. There are n numbers in a given expression. X1 X2 X3 .... Xn What is the number of ways to put parenthesis in the expression. For n=4, the different ways are (((x1.x2).x3).x4) ((x1.x2).(x3.x4)) (x1.((x2.x3).x4)) (x1.(x2.(x3.x4))) ((x1.(x2.x3)).

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solution.cppC++17

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