c++ map

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_map
    std::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;
}