map的增加元素，删除元素，查找元素操作
#include<map>
#include<iostream>
using namespace std;
int main()
{
map<string, string> a; //定义一个map
map<string, string>::iterator iter;
cout << "-----------增加元素" << endl;
a["cat"] = "猫";
// a["dog"] = "gou";
a.insert(pair<string, string>("dog", "狗"));
a.insert(pair<string, string>("fish", "鱼"));
cout << a["cat"] << endl;
cout << a["dog"] << endl;
cout << a["fish"] << endl;
cout << "------------删除元素" << endl;
iter = a.find("fish");
a.erase(iter); // 使用迭代器删除
int n = a.erase("dog"); // 使用key删除
cout << "是否删除dog成功？:" << n << endl;
// a.erase(a.begin(), a.end()); // 全部删除， == a.clear()
// a.clear(); // 全部删除
cout << "-------------查找元素" << endl;
iter = a.find("cat");
if(iter != a.end())
{
cout << "I find it" << endl;
cout << iter->first << endl;
cout << iter->second << endl;
}
else
{
cout << "Do not Find" << endl;
}
return 0;
}
