STL set multiset map multimap unordered_set unordered_map example
#include<map>#include<stdio.h>#include<unordered_map> #include<algorithm>//#include<unordered_multimap> //there isn't such a library#include<string>#include<iostream>using namespace std;int main(){unordered_multimap<int, string> mapStudent1;mapStudent1.insert(pair<int, string>(1, "student_one"));mapStudent1.insert(pair<int, string>(2, "student_two"));mapStudent1.insert(unordered_multimap<int, string>::value_type (2, "student_two")); //这样插入也可以，但是注意key是Unique的 mapStudent1.insert(make_pair<int, string>(3, "student_three"));mapStudent1.insert(make_pair<int, string>(3, "student_three"));//mapStudent.emplace(5,"student_five"); //Have to add the command '-std=c++11' for compilerunordered_multimap<int, string>::iterator iter1;for(iter1 = mapStudent1.begin(); iter1 != mapStudent1.end(); iter1++){cout<<iter1->first<<" "<<iter1->second<<endl;}printf("-------------------------------\n\n");map<int, string> mapStudent2;mapStudent2.insert(pair<int, string>(1, "student_one"));mapStudent2.insert(pair<int, string>(2, "student_two"));mapStudent2.insert(map<int, string>::value_type (2, "student_two")); //这样插入也可以，但是注意key是Unique的 mapStudent2.insert(pair<int, string>(3, "student_three"));mapStudent2.insert(pair<int, string>(3, "student_three"));mapStudent2[4]="hello"; //利用数组插入同样可以，但是效率比较低 //mapStudent.emplace(5,"student_five"); //Have to add the command '-std=c++11' for compilermap<int, string>::iterator iter2;for(iter2 = mapStudent2.begin(); iter2 != mapStudent2.end(); iter2++){cout<<iter2->first<<" "<<iter2->second<<endl;}printf("-------------------------------\n\n"); std::unordered_multimap<std::string,std::string> myumm = { {"orange","FL"}, {"strawberry","LA"}, {"strawberry","OK"}, {"pumpkin","NH"} }; for (auto& x: {"orange","lemon","strawberry"}) { std::cout << x << ": " << myumm.count(x) << " entries.\n"; } printf("-------------------------------\n\n");typedef std::unordered_multimap<std::string,std::string> stringmap; stringmap myumm1 = { {"orange","FL"}, {"strawberry","LA"}, {"pumpkin","NH"}, {"strawberry","OK"} };cout<<"All entries are:"<<endl;stringmap::iterator iter3;for(iter3 = myumm1.begin(); iter3 != myumm1.end(); iter3++){cout<<iter3->first<<" "<<iter3->second<<endl;} std::cout << "Entries with strawberry:"; auto range = myumm1.equal_range("strawberry"); for_each ( range.first, range.second, [](stringmap::value_type& x){std::cout << " " << x.second;} );return 0;}