which is almost as slow as the linear vector search. The way in which binary search minimizes the number of comparisons really pays off. However the binary list search looks pretty much linear, rather than logarithmic, and is still substantially slower than the binary vector search. Counting nod...
主要是 std::binary_serach, std::upper_bound以及std::lower_bound 的用法,示例如下: 1 std::vector<int> vtr; 2 for (int i = 0; i < 100000; i++) 3 { 4 if (i%2 == 0) 5 vtr.push_back(i); 6 } 7 8 auto find = [&](int num){ 9 return std::binary_search(vtr.begin()...
binary_search (2) template<classForwardIt,classT=typenamestd::iterator_traits<ForwardIt>::value_type,classCompare>boolbinary_search(ForwardIt first, ForwardIt last,constT&value, Compare comp){first=std::lower_bound(first, last, value, comp);return(!(first==last)and!(comp(value,*first)));...
While perusinghttp://en.cppreference.com/w/cpp/algorithm/binary_searchI've noticed it takes forward iterator as an argument. Now I'm confused, since I thought it would rather be an random access iterator, so the binary search will be actually binary. To satisfy my curiosity, I've written...
Binary search(operating on partitioned/sorted ranges): lower_bound Return iterator to lower bound (function template ) upper_bound Return iterator to upper bound (function template ) equal_range
与std::binary_search不同,std::lower_bound不要求operator<或comp不对称(即a<b和b<a的结果始终不同)。实际上,它甚至不要求value<*iter或comp(value,*iter)对于[first,last)中的任意迭代器iter良构。 功能特性测试宏值标准功能特性 __cpp_lib_algorithm_default_value_type202403(C++26)算法中的列表初始化(1...
template<classT>inlinevoiderase_selected(std::vector<T>& v,conststd::vector<int>& selection){ v.resize(std::distance( v.begin(), std::stable_partition(v.begin(), v.end(), [&selection, &v](constT& item) {return!std::binary_search( selection.begin(), selection.end(),static_cast<...
参照参数类型的改动,依葫芦画瓢地修改binary_search为:std::optional<int> binary_search(const std::vector<int> &list, int item) { size_t low{0}; size_t high{list.size() - 1}; while (low <= high) { auto mid = (low + high); auto guess = list[mid]; if (guess == item) { ...
看书一直看到这个语句的副作用什么什么的,这个操作符的副作用之类的,可是怎么理解这个副作用的意 分享19赞 c语言吧 不再奢望▫ c++的二分查找binary_search, 我想找第n个结构体数组(arr[n])中的某个值是否存在(包括字符),怎么用binary_search写? 大佬 分享19赞 c++吧 🐯多🐯 这个是什么原因?error: ...
(_BinaryPredicateConcept<_BinaryPredicate,typename iterator_traits<_ForwardIterator1>::value_type,typename iterator_traits<_ForwardIterator2>::value_type>)__glibcxx_requires_valid_range(__first1,__last1);__glibcxx_requires_valid_range(__first2,__last2);returnstd::__search(__first1,__last1,...