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Language/Type: C++ Vector collections
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Author: Marty Stepp (on 2016/06/16)

Write a function named cumulative that accepts as a parameter a reference to a Vector of integers, and modifies it so that each element contains the cumulative sum of the elements up through that index. For example, if the vector passed contains {1, 1, 2, 3, 5}, your function should modify it to store {1, 2, 4, 7, 12}.

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This is a function problem. Write a C++ function as described. Do not write a complete program; just the function(s) above.

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