unordered_map

#include <iostream>
#include <string>
#include <unordered_map>int main()
{// 创建包含三个字符串的（映射到字符串的）unordered_mapstd::unordered_map<std::string, std::string> u ={{"red", "#FF0000"},{"green", "#00FF00"},{"blue", "#0000FF"}};map<string,string> xs;xs.insert(make_pair("555","44444"));xs["222"] ="aaa";xs["333"] ="aaaa";for (auto x:xs) {cout<<x.first<<"\t"<<x.second<<endl;}
}

find方法查找

map<string,string> mm;
mm["12"] ="12";
mm["13"] ="13";
mm["14"] ="14";
auto iterator = mm.find("13");
if (iterator != mm.end()){cout<< iterator->first<<"\t"<<iterator->second<<endl;
}