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Jan 10, 2023 · The lower_bound () method in C++ is used to return an iterator pointing to the first element in the range [first, last) which has a value not less than val. This means that the function returns an iterator pointing to the next smallest number just greater than or equal to that number.
Mar 2, 2024 · Prerequisite: Random-access Iterators in C++, Bidirectional Iterators in C++. std::lower_bound in C++: The lower_bound() method in C++ is used to return an iterator pointing to the first element in the range [first, last) which has a value not less than the given value.
May 20, 2024 · Returns the first iterator iter in [first,last) where bool(comp(*iter, value)) is false, or last if no such iter exists. If the elements elem of [first,last) are not partitioned with respect to the expression bool(comp(elem, value)), the behavior is undefined.
lower_bound. function template. <algorithm> std:: lower_bound. Return iterator to lower bound. Returns an iterator pointing to the first element in the range [first,last) which does not compare less than val. The elements are compared using operator< for the first version, and comp for the second.
std:: lower_bound. C++. Algorithm library. Returns an iterator pointing to the first element in the range [first, last) that is not less than (i.e. greater or equal to) value, or last if no such element is found.
Jun 18, 2023 · lower bound returns pointer/iterator to the first occurrence of the element which is no less than i.e. greater or equal to the value mentioned. If no such element exists then, it returns the...
Oct 30, 2021 · std::map<Key,T,Compare,Allocator>:: lower_bound. 1,2) Returns an iterator pointing to the first element that is not less than (i.e. greater or equal to) key. 3,4) Returns an iterator pointing to the first element that compares not less (i.e. greater or equal) to the value x. This overload participates in overload resolution only if the ...
Jan 31, 2017 · The simple answer is [ lower_bound, upper_bound ) s.lower_bound(t) will return iterator to the first element v in set such that v >= t s.upper_bound(t) will return iterator to the first element v in set such that v > t. When we often call xxxxx_bound for the STL set or map, we often want to find the data in some range.
The lower_bound() function is a type of binary_search(). This function searches for the first place that val can be inserted into the ordered range defined by first and last that will not mess up the existing ordering.
There's one significant difference between the iterators returned by lower_bound and find. If lower_bound doesn't find the item, it will return the iterator where the item should be inserted to retain the sort order.
