// time complexity of an unordered_map #include <bits/stdc++.h> using namespace std; using namespace std::chrono; int N = 55000; int prime1 = 107897; int prime2 = 126271; void insert(int prime) { // Starting the clock auto start = high_resolution_clock::now(); unordered_map<int...
#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...
First, let's slightly modify the insert_numbers function in the blog. We'll divide the function into the construction part and the testing part, so that we can easily use only the construction part when we actually hack. Note that unordered_map and unordered_set work exactly the same for ...
Time complexity Constant i.e. O(1) in average case. Linear i.e. O(n) in worst case. Example The following example shows the usage of std::unordered_map::insert() function. Open Compiler #include<iostream>#include<unordered_map>usingnamespacestd;intmain(void){unordered_map<char,int>um=...
C++11 unordered_map::hash_function C++11 unordered_map::insert C++11 unordered_map::key_eq C++11 unordered_map::load_factor C++11 unordered_map::max_bucket_count C++11 unordered_map::max_load_factor C++11 unordered_map::max_size C++11 unordered_map::operator[] C++11 unordered...
MapKey MyMap; gettimeofday(&begin,NULL);for(inti=0;i<N;++i) 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) ...
MapKey MyMap; gettimeofday(&begin,NULL);for(inti=0;i<N;++i) 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) ...
a and b are equal b and c are not equal 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) ...
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. non-member overloads: operators (unordered_set) swap (unordered_set)
cout <<"\nFirst6 set: ";for(conststring& x: first6 ){ cout <<" "<< x; }return0;/** other function please to see the unordered_map */ Reference cplusplus