Write a template function "lessrange" which returns true if one range is less than another range. It has one template parameter: an iterator. It has four iterator arguments: "begin" and "end" for the first range; and "begin" and "end" for the second range. It scans both ranges in parallel and returns true as soon as it finds a pair which is operator< than the other, and false otherwise. If one range is a subrange of the other, the shorter one is less than the other. Use only operator< to perform comparisons and assume that it exists for the elements in the range.
vector<int> v1{1, 3, 5, 9, 11, 13, 15, 22};
vector<int> v2{3, 4, 7, 10, 16};
vector<int> v3{3, 4, 7, 10, 16, 19, 20};
For example, v1 < v2 is true, v1 < v1 is false, v2 < v3 is true.
