Write a function sumElements which performs an addition operation on the elements in a vector if their indices are between start_index and end_index. • Function Specifications: o The function name: sumElements o The function parameters in this order: ▪ vector vect: a vector of integers ▪ int start_index: the lower bound of the range of indices for the vector, vect ▪int end_index: the higher bound of the range of indices for the vector, vect o The function returns an integer depending on the following conditions: ▪ It returns the sum of all elements in the vector(inclusive of start_index and end_index) ▪ It returns -1 if start_index is greater than end_index ▪ It returns -2 if either or both start_index and end_index exceed the bounds of the vector

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