1. Birthdays

#include<iostream>

using namespace std;

struct Contact
{
    char name[20];
    char surname[20];
    int day;
    int month;
    int year;
    char phoneNumber[20];
};

struct BirthdayCalendar
{
    Contact contacts[20];
    int number;

    void birthdays(int d, int m, int y)
    {
        cout<<"Birthdays on:"<<d<<"."<<m<<"."<<y<<endl;
        for(int i=0;i<number;i++)
            if(contacts[i].day==d && contacts[i].month==m && contacts[i].year==y)
                cout<<contacts[i].name<<"\t"<<contacts[i].surname<<"\t"<<contacts[i].phoneNumber<<"\t"<<contacts[i].year-y<<endl;
    }
};

int main()
{
    int i, d, m, y;
    BirthdayCalendar bc;
    cin >> bc.No;
    for(i = 0; i < bc.No; i++){
        cin >> bc.contacts[i].name;
        cin >> bc.contacts[i].surname;
        cin >> bc.contacts[i].day;
        cin >> bc.contacts[i].month;
        cin >> bc.contacts[i].year;
        cin >> bc.contacts[i].phone;
    }
    cin >> d >> m >> y;
    bc.birthdays(d, m, y);
	return 0;
}