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cumulative

Language/Type: C++ vector collections STL
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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}.

Function: Write a C++ function as described, not a complete program.

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