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who can help me? :(

serious (4)
i have these header files:

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#ifndef __LEAGUE_H_
#define __LEAGUE_H_
#include <iostream>
#include <string>
#include <vector>
#include <cstdlib>
#include "team_heder.h"
#include "match_heder.h"

	using namespace std;

	class League {
	public:
		League(vector<string>);
		void add_match(Match);
		void print_champion();
		void print_top_scorer();
	private:
		vector<Team> teams_of_league;
	};
#endif



#ifndef __TEAM_H_
#define __TEAM_H_
#include <iostream>
#include <string>
#include <vector>
#include <cstdlib>

	using namespace std;

	class Team {
	
	public:
		Team(string tm_nm);
		void add_scorer(string);
		string get_name();
		vector<string> get_scorer();
		string get_scr_nm(int);
		void add_score(int);
		int get_score();

	private:
		string	team_name;
		int score;
		vector<string> scorer;

	};
#endif



#ifndef __MATCH_H_
#define __MATCH_H_
#include <iostream>
#include <string>
#include <vector>
#include <cstdlib>

#include "team_heder.h"
	using namespace std;
	class Match {
	public:
		Match(string, string);
		void add_host_goal(string);
		void add_guest_goal(string);
		string get_host_name();
		string get_guest_name();
		string get_guest_src_nm(int i);
		string get_host_src_nm(int i);
		vector<string> get_host_scorer();
		vector<string> get_guest_scorer();
	private:
		Team guest_team;
		Team host_team;
	};
#endif


____________________________________________________________________________________

and their cpp ..

and this main:

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#include "match_heder.h"
#include "league_heder.h"
#include "team_heder.h"


int main()
{
	int t, n_team;
	for (cin >> t; t != 0; t--){
		vector<string> teams;
		string team_name;
		for (cin >> n_team; n_team != 0; n_team--) {
			cin >> team_name;
			teams.push_back(team_name);
		}

		League league(teams);

		while (true) {
			string host, guest;
			cin >> host >> guest;
			if (host == "-" && guest == "-")
				break;

			Match match(host, guest);
			int host_score, guest_score;
			cin >> host_score >> guest_score;
			string scorer;
			for (int i = 0; i < host_score; i++) {
				cin >> scorer;
				match.add_host_goal(scorer);
			}
			for (int i = 0; i < guest_score; i++) {
				cin >> scorer;
				match.add_guest_goal(scorer);
			}

			league.add_match(match);
		}
		league.print_champion();
		league.print_top_scorer();
	}
	return 0;
}

/////////////////////////////////////////////////////////////////////////////////////////////////////

after compiling, i got these errors :

ProfHadis-MacBook-Pro:~ hadi$ g++ team_heder.h
ProfHadis-MacBook-Pro:~ hadi$ g++ match_heder.h
ProfHadis-MacBook-Pro:~ hadi$ g++ league_heder.h
ProfHadis-MacBook-Pro:~ hadi$ g++ team_cpipi.cpp
Undefined symbols for architecture x86_64:
  "_main", referenced from:
      start in crt1.10.6.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status
ProfHadis-MacBook-Pro:~ hadi$ g++ team_cpipi.cpp
Undefined symbols for architecture x86_64:
  "_main", referenced from:
      start in crt1.10.6.o
ld: symbol(s) not found for architecture x86_64
collect2: ld returned 1 exit status

WHAT SHOULD I DO ???
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