#include"map"
int main() {
    map<int,string> um;
    um.insert(pair<int,string>(2,"steve"));
    um[1]="antonio";

    //访问方式,可以看到插入的元素最后会按照key值排序
    for (auto item:um) {
        cout<<item.first<<"  "<<item.second<<endl;
    }
    //1  antonio
    //2  steve
    return  0;
}

#include"map"
int main() {
    map<int,string> um;
    um.insert(pair<int,string>(2,"steve"));
    um[1]="antonio";

    if(um.find(2)!=um.end())
        cout<<"have found"<<endl;
    else
        cout<<"not found"<<endl;
    return  0;
}

#include"set"
int main() {
    set<int> us;
    us.insert(3);
    us.insert(1);
    us.insert(2);
    
    //1 2 3
    for (auto item:us) {
        cout<<item<<" ";
    }
    return  0;
}

#include"unordered_map"
#include "iostream"
using namespace std;
//对unordered_map<int,string>使用别名int_string
typedef unordered_map<int,string> int_string;
int main() {
    //初始化的几种方法
    int_string one={{3,"bash"},{1,"java"}};
    one[4]="python";//直接下标插入元素
    one.insert(pair<int,string>(2,"c++"));//使用成员方法insert插入元素

    int_string two ( one );       // 用数组初始
    int_string three ( two.begin(),two.end());   // 范围初始化

    //访问方式
    for (auto item:three) {
        cout<<item.first<<"  "<<item.second<<endl;
    }
    return  0;
}

#include"iostream"
#include"unordered_set"
using namespace std;
typedef unordered_set<int> US;
int main() {
    US us;
    us.insert(2);
    us.insert(1);
    US one(us);//one=us;是等价的
    US two(one.begin(),one.end());

    //访问方式
    for (auto item:two) {
        cout<<item<<endl;
    }
    return  0;
}

#include"vector"
using namespace std;
typedef vector<int> Vector;
int main() {
    Vector vec(10,5);
    Vector vec1(vec); //Vector vec1=vec这两种方式是等价的
    Vector vec2(vec.begin(),vec.end());
    Vector vec3={1,2,3,4};
    Vector vec4(10);//初始化数组的大小是10，value是0
    Vector vec5(10,1);//初始化数组的大小是10，value是1
    //二维矩阵的初始化
    vector<vector<int>> ans(12,vector<int>(10,0));
    vector<vector<int>> ans1(ans);
    return  0;
}

#include"iostream"
#include"vector"
using namespace std;
typedef vector<int> Vector;
int main() {
    Vector vec;
    vec.push_back(1);//push元素到末尾
    vec.push_back(2);
    vec.push_back(3);
    vec.insert(vec.begin()+1,-1);

    //1 -1 2 3
    for (int i = 0; i < vec.size(); ++i) {
        cout<<vec[i]<<" ";
    }
    vec.pop_back();//将元素弹出
    //1 -1 2
    for (int i = 0; i < vec.size(); ++i) {
        cout<<vec[i]<<" ";
    }
    return  0;
}