include iostream include string include fstream using namespace std st

#include <iostream>
#include <string.h>
#include <fstream>

using namespace std;

struct national//Нац. состав
{
	char name[64];//национальность
	unsigned int number;//численность
	float percent;//процент от всего населения
};

struct population//население
{
	unsigned int number;//численность
	char lang[128];//гос. язык
	unsigned int num_of_nationals;//кол-во национальностей
	national **nationals;//национальный состав
};

struct geograph//географическое положение
{
	char part_of_the_world[32];//часть света
	char continent[32];//материк
	unsigned int num_of_oceans;//кол-во океанов
	char **oceans;//океаны
	unsigned int num_of_seas;//кол-во морей
	char **seas;//моря
	unsigned int num_of_mountains;//кол-во горных цепей
	char **mountains;//горные цепи
};

struct country//страна
{
	char name[128];//название
	unsigned int square;//площадь
	population *popul;//население
	geograph *place;//географическое положение
} **countries;

unsigned int num_of_countr;//кол-во стран

bool read_file(char *filename)//чтение данных о странах из файла
{
	ifstream file;//объект файл
	file.open(filename);//открываем файл с именем filename
	if (file.fail()) return false;//не смогли открыть - возвращаем false
	file>>num_of_countr;//считываем кол-во стран в файле
	countries = new country*[num_of_countr];//создаём массив из заданного кол-ва стран 
	for (int i=0; i<num_of_countr; i++)//цикл считывания данных о странах
	{
		countries[i]=new country;
		file>>countries[i]->name;
		file>>countries[i]->square;
		countries[i]->place=new geograph;
		file>>countries[i]->place->continent;
		file>>countries[i]->place->part_of_the_world;
		file>>countries[i]->place->num_of_oceans;
		countries[i]->place->oceans=new char*[countries[i]->place->num_of_oceans];
		for (int j=0; j<countries[i]->place->num_of_oceans; j++)
		{
			countries[i]->place->oceans[j]=new char[32];
			file>>countries[i]->place->oceans[j];
		}
		file>>countries[i]->place->num_of_seas;
		countries[i]->place->seas=new char*[countries[i]->place->num_of_seas];
		for (int j=0; j<countries[i]->place->num_of_seas; j++)
		{
			countries[i]->place->seas[j]=new char[32];
			file>>countries[i]->place->seas[j];
		}
		file>>countries[i]->place->num_of_mountains;
		countries[i]->place->mountains=new char*[countries[i]->place->num_of_mountains];
		for (int j=0; j<countries[i]->place->num_of_mountains; j++)
		{
			countries[i]->place->mountains[j]=new char[64];
			file>>countries[i]->place->mountains[j];
		}
		countries[i]->popul=new population;
		file>>countries[i]->popul->number;
		file>>countries[i]->popul->lang;
		file>>countries[i]->popul->num_of_nationals;
		countries[i]->popul->nationals=new national*[countries[i]->popul->num_of_nationals];
		for (int j=0; j<countries[i]->popul->num_of_nationals; j++)
		{
			countries[i]->popul->nationals[j]=new national;
			file>>countries[i]->popul->nationals[j]->name;
			file>>countries[i]->popul->nationals[j]->number;
			file>>countries[i]->popul->nationals[j]->percent;
		}
	}
	return true;
}

int main()
{

	cout<<"Enter filename with countries: ";
	char temp[256];
	cin>>temp;
	if (!read_file(temp))
	{
		cout<<"ERROR!"<<endl;
		return -1;
	}
	else
	{
		cout<<"Largest number of seas: ";
		int max=0;
		int t;
		for (int i=0; i<num_of_countr; i++)
		{
			if (countries[i]->place->num_of_seas>max)
			{
				max=countries[i]->place->num_of_seas;
				t=i;
			}
		}
		cout<<countries[t]->name<<endl;
		cout<<"Enter name of mountain: ";
		cin>>temp;
		cout<<"Countries:"<<endl;
		for (int i=0; i<num_of_countr; i++)
		{
			int j=countries[i]->place->num_of_mountains;
			for (int k=0; k<j; k++)
				if (!strcmp(temp, countries[i]->place->mountains[k])) cout<<countries[i]->name<<endl;
		}
		cout<<"Enter number of nationals: ";
		cin>>t;
		cout<<"Countries:"<<endl;
		for (int i=0; i<num_of_countr; i++)
		{
			if (countries[i]->popul->num_of_nationals>t) cout<<countries[i]->name<<endl;
		}
		cout<<"Enter name of country: ";
		cin>>temp;
		cout<<"Mountains:"<<endl;
		for (int i=0; i<num_of_countr; i++)
		{
			if (!strcmp(temp, countries[i]->name))
			{
				int j=countries[i]->place->num_of_mountains;
				for (int k=0; k<j; k++) cout<<countries[i]->place->mountains[k]<<endl;
			}
		}
		cout<<"Enter number of population: ";
		cin>>t;
		cout<<"Countries:"<<endl;
		for (int i=0; i<num_of_countr; i++)
		{
			if (countries[i]->popul->number<t) cout<<countries[i]->name<<endl;
		}
	}
	return 0;
}