unordered_set 与 unordered_map

版权声明： https://blog.csdn.net/miaoxiaocheng/article/details/80658996

#include<unordered_set>
#include<iostream>
using namespace std;
int main()
{
	unordered_set<int> myset;
	myset.insert(3);
	myset.insert(5);
	myset.insert(3);
	cout<<myset.size()<<endl;
	myset.erase(3);
	if(myset.find(3)==myset.end())
	cout<<"3 not found"<< endl;
	return 0;
 } 

#include<iostream>
#include<unordered_map>
#include<string>
using namespace std;
int main()
{
	unordered_map<string,int> mymap;
	mymap.insert(make_pair("c++",100));
	mymap.insert(make_pair("java",100));
	auto itr=mymap.find("c++");
	mymap.erase("java");
	if(mymap.find("java")==mymap.end())
	cout<<"java not find"<<endl;
	return 0;
}

dev cpp 启用c11,编译时加上

-std=c++11