#include <iostream>
#pragma once

using namespace std;

namespace task4 {

	struct Node
	{
	public:
		int key;
		Node* next;
	};

	Node* newNode(int key);
	Node* list(int size, bool print);
  int sum(Node* head);

	int init()
	{
		setlocale(LC_ALL, "Russian");
		int n; cout << "Введите длину: "; cin >> n;

		Node* array = list(n, true);
		cout << "Сумма: " << sum(array);

		return 0;
	}

	Node* newNode(int key)
	{
		Node* node = new Node;
		node->key = key;
		node->next = nullptr;
		return node;
	}

	Node* list(int size, bool print)
	{
		Node* head = newNode(1);
		Node* last = newNode(2);
		head->next = last;

		for (int i = 0; i < size; i++)
		{
			Node* node = newNode(rand());

			if (print) { cout << node->key << " "; }

			last->next = node;
			last = node;
		}
		if (print) { cout << endl; }

		return head;
	}

	int sum(Node* head)
	{
		int sum = 0;
		Node* ptr = head;

		while (ptr)
		{
			sum = sum + ptr->key;
			ptr = ptr->next;
		}

		return sum;
	}
}