#include <bits/stdc++.h> using namespace std; int main() { vector<int> arr{ 3, 2, 1, 4, 5, 6, 7 }; //tp perform binary search we need sorted //input array sort(arr.begin(), arr.end()); int search_element = 4; //ForwardIterator first=arr.begin() //ForwardIterator last...
然而,对于非遗留随机访问迭代器 (LegacyRandomAccessIterator) ,迭代次自增次数为线性。 可能的实现版本一 template<class ForwardIt, class T> bool binary_search(ForwardIt first, ForwardIt last, const T& value) { first = std::lower_bound(first, last, value); return (!(first == last) && !(...
Return iterator to lower bound (function template ) upper_bound Return iterator to upper bound (function template ) equal_range Get subrange of equal elements (function template ) binary_search Test if value exists in sorted sequence (function template ...
template <classForwardIterator,classT>boolbinary_search ( ForwardIterator first, ForwardIterator last,constT&value ); template<classForwardIterator,classT,classCompare>boolbinary_search ( ForwardIterator first, ForwardIterator last,constT& value, Compare comp ); 可以看到binary_search的迭代器是前向迭代...
std::ranges::binary_search doesn't return an iterator to the found element when an element whose projection equals value is found. If an iterator is desired, std::ranges::lower_bound should be used instead. Feature-test macroValueStdFeature __cpp_lib_algorithm_default_value_type 202403 (...
//ForwardIterator last=arr.begin()+arr.size()-1//const T& val=search_elementif(binary_search(arr.begin(), arr.begin()+arr.size()-1, search_element)) { cout<<"search_element "<<search_element<<" found\n"; }elsecout<<"search_element "<<search_element<<" not found\n";return0;...
binary_search (2) template<class ForwardIt, class T = typename std::iterator_traits<ForwardIt>::value_type, class Compare> bool binary_search(ForwardIt first, ForwardIt last, const T& value, Compare comp) { first = std::lower_bound(first, last, value, comp); return (!(first == la...
然而,对于非遗留随机访问迭代器 (LegacyRandomAccessIterator) ,迭代次自增次数为线性。 可能的实现 版本一 template<class ForwardIt, class T> std::pair<ForwardIt,ForwardIt> equal_range(ForwardIt first, ForwardIt last, const T& value) { return std::make_pair(std::lower_bound(first, last, ...
std::binary_search 在排序的vector中进行二分查找; std::binary_search(v.begin(),v.end(),v.element_type_obj,compare); std::unique 将排序的vector vector<element_type>::iterator iter = std::unique(v.begin(),v.end(),compare); v.resize(iter-v.begin()); ...
return lhs < rhs.aT; }); 这是非常令人讨厌的,如果没有查找更多的东西,我不确定你实际上是否有权假设实现只使用比较器的方式在文本中描述 - 这是结果的定义,而不是意味着到达那里。它对 binary_search 或 equal_range 也无济于事。 在25.3.3.1中没有明确说明迭代器的值类型必须可以转换为T,但它有点暗示...