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reverseFirstK

Language/Type: C++ vector traversals STL
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Write a function named reverseFirstK that accepts a reference to a vector of integers and an index k as parameters and modifies the first k elements of the vector to be in reverse order. For example, if the vector a stores {10, -2, 33, 55, 9, 17, 6}, the call of reverseFirstK(a, 5) should reverse the first 5 elements, modifying it to store {9, 55, 33, -2, 10, 17, 6}. If the value of k is 1, 0, negative, or greater than the length of the vector, do not modify the vector.

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

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