Järjestys

#include <iostream>
#include <string>
#include <cstdio>

int main()
{
	int count;
	std::cin >> count;
	int *numbers_c = new int[count+1];
	int *numbers_cb = new int[count+1];

	bool *numbers_list = new bool[count+1];
	int numbers_list_size = 0;

	int *numbers = new int[count+1];
	int *numbers_i = new int[count+1];
	int *klist = new int[count*5];
	int klist_top = 0;
	for(int i = 1;i <= count;i++)
	{
		std::cin >> numbers[i];
		numbers_i[numbers[i]] = i;
		numbers_c[i] = numbers[i];
		numbers_cb[i] = 0;
		numbers_list[i] = false;
	}
	for(int i = 1;i <= count;i++)
	{
		if(numbers[numbers[i]] == i && numbers[i] != i) //swap
		{
			int max = (i > numbers[i] ? i : numbers[i]);
			int min = (i > numbers[i] ? numbers[i] : i);
			int difference = max - min;

			klist[klist_top++] = max;
			klist[klist_top++] = difference;
			klist[klist_top++] = difference-1;
			klist[klist_top++] = difference;
			klist[klist_top++] = difference+1;
			klist[klist_top++] = max;

			int ival = numbers[i];
			numbers[i] = i;
			numbers[ival] = ival;


		}
	}

	int current_index = 1;
	while(1)
	{
		numbers_list[current_index] = true;
		numbers_list_size++;
		current_index = numbers[current_index];
		if(current_index == 1)
			break;
	}
	//search first where numbers_list[i] != true && numbers[i] != i
	int numbers_list2_i1 = 0;
	int numbers_list2_in = 0;
	for(int i = 1;i <= count;i++)
	{
		if(!numbers_list[i] && !(numbers[i] == i))
		{
			numbers_list2_i1 = i;
			break;
		}
	}
	if(numbers_list2_i1 != 0)
	{
		//search last (numbers_list2_in) in linked sequence
		current_index = numbers[numbers_list2_i1];
		while(numbers[current_index] != numbers_list2_i1)
		{
			current_index = numbers[current_index];
		}
		numbers_list2_in = current_index;
		//swap numbers_list2_in and numbers_i[1] (6 reversals)
		int max = (numbers_list2_in > numbers_i[1] ? numbers_list2_in : numbers_i[1]);
		int min = (numbers_list2_in > numbers_i[1] ? numbers_i[1] : numbers_list2_in);
		int difference = max - min;

		klist[klist_top++] = max;
		klist[klist_top++] = difference;
		klist[klist_top++] = difference-1;
		klist[klist_top++] = difference;
		klist[klist_top++] = difference+1;
		klist[klist_top++] = max;

		int inval = numbers[numbers_list2_in];
		numbers[numbers_list2_in] = 1;
		numbers[numbers_i[1]] = inval;
		//numbers_i unchanged

	}
	//solve by swapping 1. to correct position (4 reversals)
	
	current_index = 1;
	while(1)
	{
		int final_position = current_index;

		klist[klist_top++] = final_position-1;
		klist[klist_top++] = final_position-2;
		klist[klist_top++] = final_position-1;
		klist[klist_top++] = final_position;

		current_index = numbers[final_position];
		if(current_index == 1)
			break;
	}
	std::cout << klist_top << '\n';
	for(int k = 0;k < klist_top;k++)
	{
		if(klist[k] < 1)
			klist[k] = 1;
		if(klist[k] > count)
			klist[k] = count;
		std::cout << klist[k] << ' ';
	}
	



	/*for(int k = 0;k < klist_top;k++)
	{
		for(int i = 1;i <= klist[k];i++)
		{
			numbers_cb[i] = numbers_c[i];
		}
		for(int i = 1;i <= klist[k];i++)
		{
			numbers_c[i] = numbers_cb[klist[k] - i + 1];
		}
	}
	for(int i = 1;i <= count;i++)
	{
		std::cout << numbers_c[i] << ' ';
	}*/


	/*std::cin.clear();
	std::cin.get();
	std::cin.get();*/
	return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: WRONG ANSWER