#include <stdio.h>
#include <stdlib.h>

#define SIZE 1000

int input(int *arr);
void output(int *arr, int size);
int num_of_series(int *arr, int size);
int delete_k_serie(int *arr, int size, int k);
void swap_series(int *arr, int size, int k);
int delete_series_lt_k(int *arr, int k);

int main()
{
  int arr[SIZE];
  int *ptr = arr;

  int arr_size = input(ptr);

  printf("There is %d series. \n\n", num_of_series(ptr, arr_size));

  printf("First and fourth series were swaped. \n");

  swap_series(ptr, arr_size, 4);

  output(ptr, arr_size);

  return 0;
}

int input(int *arr)
{
  int n;
  puts("Enter size of array: ");
  scanf("%d", &n);

  for(int i = 0; i < n; i++)
  {
    printf("arr[%d] = ", i);
    scanf("%d", &arr[i]);
  }

  puts("\n");

  return n;
}

void output(int *arr, int size)
{
  for(int i = 0; i < size; i++)
  {
    printf("arr[%d] = %d \n", i, arr[i]);
  }
  puts("\n");
}

int num_of_series(int *arr, int size)
{
  int num = 1;

  for(int i = 1; i < size; i++) if (arr[i] != arr[i - 1]) num++;

  return num;
}

int delete_k_serie(int *arr, int size, int k)
{
  int num_of_current_serie = 1;
  int size_of_k_serie = 0;
  int end_of_k_serie;

  if (num_of_series(arr, size) < k) return size;

  for(int i = 1; i < size; i++)
  {
    if (arr[i] != arr[i - 1]) num_of_current_serie += 1;

    if (num_of_current_serie == k)
    {
      size_of_k_serie += 1;
      end_of_k_serie = i;
    }
  }

  for(int i = end_of_k_serie + 1; i < size; i++) arr[i - size_of_k_serie] = arr[i];

  return size - size_of_k_serie;
}

void swap_series(int *arr, int size, int k)
{
  if (num_of_series(arr, size) < k) return;

  int size_of_first_serie = 1;

  while (arr[size_of_first_serie] == arr[size_of_first_serie - 1]) size_of_first_serie += 1;

  int num_of_current_serie = 1;
  int size_of_k_serie = 0;
  int end_of_k_serie;

  for(int i = 1; i < size; i++)
  {
    if (arr[i] != arr[i - 1]) num_of_current_serie += 1;

    if (num_of_current_serie == k)
    {
      size_of_k_serie += 1;
      end_of_k_serie = i;
    }
  }

  if (size_of_first_serie == size_of_k_serie)
  {
    int difference = end_of_k_serie - size_of_first_serie + 1;
    int t;

    for(int i = 0; i < size_of_first_serie; i++)
    {
      t = arr[i];
      arr[i] = arr[i + difference];
      arr[i + difference] = t;
    }
  }
  else if (size_of_first_serie < size_of_k_serie)
  {
    int *first_serie = (int*) malloc(sizeof(int) * size_of_first_serie);

    for(int i = 0; i < size_of_first_serie; i++) first_serie[i] = arr[i];

    // Циклический сдвиг вправо на длину k-ой серии
    for(int i = size + size_of_k_serie; i > size_of_k_serie - 1; i--) arr[i] = arr[i - size_of_k_serie];

    // Перенос k-ой серии в начало
    for(int i = 0; i < size_of_k_serie; i++) arr[i] = arr[i + end_of_k_serie + 1];

    for(int i = 0; i < size_of_k_serie; i++) arr[i + end_of_k_serie - size_of_k_serie + 1] = first_serie[i];

    for(int i = end_of_k_serie - size_of_first_serie + 1; i < size + size_of_first_serie; i++) arr[i] = arr[i - size_of_k_serie + size_of_first_serie];



    for(int i = size_of_k_serie; i < size; i ++) arr[i] = arr[i + size_of_first_serie];
  }
}