学习目标：用C++编写简单的程序学习内容：#include<iostream>#include<algorithm>#include<map>usingnamespacestd;intmain(){ intn,a,b,id,s; map<int,int>mp; map<int,int>::iteratorp; cin>>n; mp[1e9]=1; for(inti=1;i<=n;++i