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#include <iostream>
#include <iterator>
#include <string>
#include <vector>

class Tree {
    struct TreeNode {
        TreeNode *left, *right;
        TreeNode *parent;

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#include <climits>
#include <iostream>
#include <fstream>
#include <cstring>
#include <new>

using namespace std;

/*
 * data access layer - взаимодействует с данными непосредственно во внешних источниках

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#include <climits>
#include <iostream>
#include <cstring>
#include <new>

using namespace std;

class Matrix {
    struct MatrixData {
        double *nums;

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#include <climits>
#include <iostream>
#include <cstring>
#include <new>

using namespace std;

class Matrix {
    struct MatrixData {
        double *nums;

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#include <climits>
#include <iostream>
#include <cstring>
#include <new>

using namespace std;

class Matrix {
    double *nums;
    size_t nrows, ncols;

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#include <chrono>
#include <cstring>
#include <iostream>
#include <vector>
using namespace std;

class TwoDimArray {
    double *data;
    size_t nrows, ncols;
public:

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#include <iostream>
using namespace std;

class Animal {
    string latin_name;
public:
    Animal(string latin_name) : latin_name{latin_name} {}
    virtual ~Animal() { cerr << "Animal::~Animal called for " << latin_name << endl; }
    virtual string get_display_name() const { return latin_name; }
    virtual int foo() = 0;

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#include <iostream>
using namespace std;

int ma8in() {
    int a = 3, b = 7, c, nums[100] = { 11, 22, 33 };
    int *p1 = &a, *p2 = &b, *p3 = &c, *pn = nums;
    void *p = p1; p3 = (int*)p;
    c = a + b;
    cout << "a="  << a  << ", b="  << b <<  ", c=" << c
       << ", *p1=" << *p1 << ", *p2=" << *p2 << ", *p3=" << *p3 << endl;

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#include <ctime>
#include <iostream>
using namespace std;
class Animal {
    string name;
    time_t birth_date;
public:
    Animal(string name, time_t birth_date) : name(name), birth_date(birth_date) {}
    string get_name() const { return name; }
    time_t get_birth_date() const { return birth_date; }

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#include <cmath>
#include <cstdlib>
#include <iostream>

using namespace std;

float calc(string op, float x, float y);

int main() {
    float x, y, res;