PAT 1006 Sign In and Sign Out

#include<iostream>#include<string>using namespace std;int main(){typedef struct{string id;string login;string logout;}info;info min;info max;info tmp;int n;cin>>n;for(int i=0; i<n; ++i){cin>>tmp.id>>tmp.login>>tmp.logout;if(min.id.size() == 0){min = tmp;max = tmp;}else{if(min.login.compare(tmp.login) > 0){min = tmp;}if(max.logout.compare(tmp.logout) < 0){max = tmp;}}}cout<<min.id<<" "<<max.id<<endl;return 0;}