pair的运用

#include<iostream>
#include<utility>
#include<string>
using namespace std;
int main(){
    pair<string,int>p;
    p.first="haha";
    p.second=5;
    cout<<p.first<<" "<<p.second<<endl;
    p=make_pairr("xixi",55);
    cout<<p.first<<" "<<p.second<<endl;
    p=pair<string,int>("heihei",555);
    cout<<p.first<<" "<<p.second<<endl;
    return 0;
}
#include<cstdio>
#include<utility>
using namespace std;
int main(){
    pair<int,int>p1(5,10);
    pair<int,int>p2(5,15);
    pair<int,int>p3(10,5);
    if(p1<p3)printf("p1<p3\n");
    if(p1<=p3)printf("p1<=p3\n");
    if(p1<p2)printf("p1<p2\n");
    return 0;
}
#include<iostream>
#include<string>
#include<map>
using namespace std;
int main(){
    map<string,int>mp;
    mp.insert(make_pair("heihei",5));
    mp.insert(pair<string,int>("hahha",10));
    for(map<string,int>::iterator it=mp.begin();it!=mp.end();it++){
        cout<<it->first<<" "<<it->second<<endl;
    }
    return 0;
}