Jump, jump P77227

Being @v@ a vector of integer numbers. Starting in any position @p@ of @v@, jump in the vector according to @v[p]@: When it is positive, it must jump @v[p]@ steps to the right; when it is negative, it must jump $-$@v[p]@ steps to the left. The process is always repeated, unless it goes out of bounds.

Write a function

    string exit(int p, vector<int>& v);

that returns “left”, “right” or “never” depending on whether the process goes out of bounds on the left side, on the right side or never ends.

Precondition

$0 \le$@p@$<$@v.size()@

Observation

The value of @v@ at the end is not important. Moreover, notice that the parameter @v@ has not been declared as constant. Take advantage of this fact to write a function as efficient as possible.

Observation

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