but organized intobucketsdepending on their hash values to allow for fast access to individual elements directly by theirkey values(with a constant average time complexity on average).
but organized into buckets(桶) depending on their hash values to allow for fast access to individual elements directly by their key values (with a constant average time complexity on average).
but organized intobucketsdepending on their hash values to allow for fast access to individual elements directly by theirkey values(with a constant average time complexity on average).
#include <iostream>#include <map>int main() {// 创建并初始化一个mapstd::map<std::string, int> m = { {"Alice", 25}, {"Bob", 22}, {"Charlie", 30} };// 插入元素// std::pair<iterator,bool> insert (const value_type& val);m.insert(std::make_pair("David", 32));// 查找...
MyMap.insert(make_pair(i,i)); gettimeofday(&end,NULL); cout<<"insert N="<<N<<",cost="<<end.tv_sec-begin.tv_sec +float(end.tv_usec-begin.tv_usec)/1000000<<"sec"<<endl;for(inti=0;i<N;++i) MyMap.find(i); gettimeofday(&end,NULL); ...
insert,emplace,emplace_hint,operator[]Only if causes rehash eraseOnly to the element erased Notes The swap functions do not invalidate any of the iterators inside the container, but they do invalidate the iterator marking the end of the swap region. ...
unordered_map::insert unordered_map::insert_range (C++23) unordered_map::insert_or_assign (C++17) unordered_map::emplace unordered_map::emplace_hint unordered_map::try_emplace (C++17) unordered_map::erase unordered_map::swap unordered_map::extract ...
* Complexity similar to that of the range constructor. */ template<typename _InputIterator> void insert(_InputIterator __first, _InputIterator __last) { _M_h.insert(__first, __last); }/** * @brief Attempts to insert a list of elements into the %unordered_map. ...
Edit & Run Complexity Constant. Iterator validity All iterators, pointers and references remain valid, but now are referring to elements in the other container, and iterate in it.
Complexity Average case: linear insize. Worst case: quadratic insize. Iterator validity No changes. See also unordered_map::equal_range Get range of elements with specific key(public member function) unordered_map::operator= Assign content(public member function)...