Lab11/12A

#include <iostream>
using namespace std;

void cocktail (int mass[], int n)
{
    int left = 1, right = n - 1, temp;
    while (left < right)
    {
        for (int i = right; i > left - 1; i--)
            if (mass[i - 1] > mass[i])
            {
                temp = mass[i];
                mass[i] = mass[i - 1];
                mass[i - 1] = temp;
            }
            left++;
        for (int i = left; i < right + 1; i++)
            if (mass[i - 1] > mass[i])
            {
                temp = mass[i];
                mass[i] = mass[i - 1];
                mass[i - 1] = temp;
            }
            right--;
    }
}


int main()
{
    int n;
    cout << "Vvedite razmer massiva: ";
    cin >> n;
    int* mass = new int[n];
    cout << "Vvedite elementi massiva: ";
    for (int i = 0; i < n; i++)
    {
        cin >> mass[i];
    }
    cocktail(mass, n);
    cout << "Sorted massiv and key: ";
    for (int i = 0; i < n; i++)
    {
        cout << mass[i] << " ";
    }
    cout << endl;
    int x = 17, i = 0, j = n - 1, m;
    while (i < j)
    {
        m = (i + j)/2;
        if (x > mass[m])
            i = m + 1;
        else j = m;
    }
    if (mass[i] == x)
     cout << "Key element: " << i << endl;
    else
    cout << endl << "Required element is absent" << endl;
    delete[]mass;
    return 0;
}