Build the ladder

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You are building a two way,triangular ladder. The ladder has N levels, numbered 1 through N from top to bottom. You have 3 types of marbles a,b,c, and you've decided to use them in the following manner: Within each row, you will select the types of the marbles such that there is an equal number of marbles of each type used in that level. For example, consider the following two- "two way ladders":

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solution.cppC++17

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