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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.
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.
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.
Nov 20, 2021 · std::set<Key,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.
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.
May 20, 2024 · On a range that's fully sorted (or more generally, partially ordered with respect to value) after projection, std::ranges::lower_bound implements the binary search algorithm. Therefore, std::ranges::binary_search can be implemented in terms of it.
