Code for problem 1
---------------------------------------------------------------------------------------------------
#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <fstream>
#include <tuple>
#include <map>
#include <string>

using namespace std;

int main(int argc, char* argv[])
{
    if(argc!=2 && argc!=3)//1 for program name, 1 for file name, 1 for argument name
        cout<<"You have too many arguments."<<endl;
    map<string, tuple<int, int, int>> phonebook;
    ifstream in;
    string param;
    try
    {
        in.open(argv[1]);
    }
    catch(...)
    {
        cout<<"No such file exists."<<endl;
        return 1;
    }
    if(argc==3)
        param=argv[2];

    while(in)
    {
        string name;
        int areaCode, threeDigits, fourDigits;
        in>>name;
        in>>areaCode;
        in>>threeDigits;
        in>>fourDigits;
        if(in)
        {
            phonebook[name]=make_tuple(areaCode, threeDigits, fourDigits);
        }
    }
    if(phonebook.count(param)!=0)
    {
        int x,y,z;
        tie(x,y,z)=phonebook[param];
        cout<<param<<": ("<<x<<") "<<y<<"-"<<z<<endl;;
    }
    else
    {
        for(auto i:phonebook)
        {
            int x,y,z;
            tie(x,y,z)=i.second;
            cout<<i.first<<" "<<x<<" "<<y<<" 0"<<z<<endl;
        }
    }
    return 0;
}
--------------------------------------------------------------------------------------------------
Code for problem 2
-----------------------------------------------------------------------------------------------------

#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <fstream>
#include <tuple>
#include <map>
#include <string>
#include <set>

using namespace std;

int main(int argc, char* argv[])
{
    if(argc!=2)//1 for program name, 1 for file name
        cout<<"You have too many arguments."<<endl;
    set<int> codes;
    ifstream in;
    string param;
    try
    {
        in.open(argv[1]);
    }
    catch(...)
    {
        cout<<"No such file exists."<<endl;
        return 1;
    }
    while(in)
    {
        string name;
        int areaCode;
        int threeDigits, fourDigits;
        in>>name;
        in>>areaCode;
        in>>threeDigits;
        in>>fourDigits;
        codes.insert(areaCode);
    }
    for(auto i:codes)
    {
        cout<<i<<endl;
    }

    return 0;
}

--------------------------------------------------------------------------------------------------