First occurrence

Write an efficient function

        int first_occurrence(double x, const vector<double>& v);

that returns the position of the first occurrence of x in the vector v.
If x does not belong to v, return a -1.

Precondition

The vector v is sorted in nondecreasing order.

Observation

You only need to submit the required procedure; your main program will
be ignored.

Problem information

Author: Salvador Roura

Generation: 2026-03-10T18:56:21.017Z

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