二分查找(Binary Search)是一种在有序数组中查找某一特定元素的搜索算法。搜索过程从数组的中间元素开始,如果中间元素正好是要查找的元素,则搜索过程结束;如果某一特定元素大于或者小于中间元素,则在数组大于或小于中间元素的那一半中查找,而且跟开始一样从中间元素开始比较。如果在某一步骤数组为空,则代表找不到。 2. 二分查找的算
以下是使用密钥来使用std::binary_search的示例代码: 代码语言:cpp 复制 #include <iostream> #include <vector> #include <algorithm> int main() { std::vector<int> nums = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; int key = 6; // 使用std::binary_search查找元素 bool found = ...
问如何在std::binary_search中设置针型EN在 C++ 编程中，有时候我们需要在不进行拷贝的情况下传递引用...
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)));...
C++ 的标准库(STL)提供了许多高效的算法,它们通常比手动编写的循环要快得多。但是,你可以采取一些策略来进一步提高这些算法的效率: 选择合适的算法:根据你的需求选择最合适的算法。例如,如果你需要在一个容器中查找一个元素,那么使用二分查找(std::binary_search)会比线性查找(std::find)更快。 使用迭代器:使用...
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
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); ...
std::binary_search std::equal_range std::merge std::inplace_merge std::set_difference std::set_intersection std::set_symmetric_difference std::set_union std::includes std::is_heap std::is_heap_until std::sort_heap std::push_heap std::pop_heap std::max std::max_element std::min ...