Upper bound and lower bound

Question

What is the difference between upper_bound() and lower_bound() in c++?

Answer 1

lower_bound - http://www.cplusplus.com/reference/algorithm/lower_bound/
"Returns an iterator pointing to the first element in the range [first,last) which does not compare less than val"

upper_bound - http://www.cplusplus.com/reference/algorithm/upper_bound/
"Returns an iterator pointing to the first element in the range [first,last) which compares greater than val."