rather than logarithmic, and is still substantially slower than the binary vector search. Counting nodes back and forth in the list still hurts substantially, even if we save a lot by doing only a
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 (1) template<classForwardIt,classT=typenamestd::iterator_traits<ForwardIt>::value_type>boolbinary_search(ForwardIt first, ForwardIt last,constT&value){returnstd::binary_search(first, last, value,std::less{});} binary_search (2) ...
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 Test if value exists in sorted sequence (function template ) Merge(operating on sorted ranges): merge Merge sorted ranges (function template ) inplace_merge Merge consecutive sorted ranges (function template ) ...
std::optional<int>binary_search(conststd::vector<int>&list,intitem){size_tlow{0};size_thigh{list.size()-1};while(low<=high){automid=(low+high);autoguess=list[mid];if(guess==item){returnmid;}elseif(guess>item){high=mid-1;}else{low=mid+1;}}returnstd::nullopt;} ...
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) { ...
container-binary-search 在数组的随机位置插入一个元素 O(n) container-array-insert 在链表的随机位置插入一个元素 O(pos) + O(1) container-link-insert 在平衡二叉树中插入一个元素 O(lg n) container-tree-insert 数据实验 遍历std::vector和std::list ...
RB-trees are B-trees of order 4 represented as binary search trees. A 4-node in the B-tree results in two levels in the equivalent BST. In the worst case, all the nodes of the tree are 2-nodes, with only one chain of 3-nodes down to a leaf. That leaf will be at a distance...
BinaryPred p ); (4) (C++17 起) template< class ForwardIt, class Searcher > ForwardIt search( ForwardIt first, ForwardIt last, const Searcher& searcher ); (5) (C++17 起) (C++20 起为 constexpr) 1-4) 搜索范围 [first, last) 中首次出现元素序列 [s_first, s_last) 的位置。