Description : Returns an iterator pointing to the first element in the range [first, last) which does not compare less than value passed.
Example:
std::vector<int> vec = {3, -1, 2, 5, 10, 6, 7, 4};
// lower_bound requires a sorted input {-1, 2, 3, 4, 5, 6, 7, 10}
std::sort(vec.begin(), vec.end());
auto lowerBoundIt = std::lower_bound(vec.begin(), vec.end(), 5);
// prints 5 (first value element that is not smaller than 5 is 5)
std::cout << "The lower bound element is " << *lowerBoundIt << '\n';