#include <iostream>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <vector>
using namespace std;

template <class T>
class CompleteBinTree
{
private:
    T* values;
    int current;
    int capacity;

    void resize();
    void clean();
    void copy(CompleteBinTree<T> const&);
public:
    CompleteBinTree();
    ~CompleteBinTree();
    CompleteBinTree(CompleteBinTree<T> const&);
    CompleteBinTree& operator=(CompleteBinTree<T> const&);

    void addElement(T const& x);
    int leftChildIndex(int index) const;
    int rightChildIndex(int index) const;
    bool empty() const;
    void create();
    void print() const;
    void printBFS();
    void printDFS(); // TO DO
};

template <class T>
CompleteBinTree<T>::CompleteBinTree()
{
    capacity = 16;
    current = 0;
    values = new T[capacity];
}

template <class T>
CompleteBinTree<T>::~CompleteBinTree()
{
    clean();
}

template <class T>
CompleteBinTree<T>::CompleteBinTree(CompleteBinTree<T> const& other)
{
    copy(other);
}

template <class T>
CompleteBinTree<T>& CompleteBinTree<T>::operator=(CompleteBinTree<T> const& other)
{
    if (this != &other)
    {
        clean();
        copy(other);
    }
    return *this;
}

template <class T>
void CompleteBinTree<T>::resize()
{
    T* helper = new T[capacity];
    for (int i = 1; i <= current; i++)
        helper[i] = values[i];

    clean();

    capacity *= 2;
    values = new T[capacity];
    for (int i = 1; i <= current; i++)
        values[i] = helper[i];
    delete[] helper;
}

template <class T>
void CompleteBinTree<T>::copy(CompleteBinTree<T> const& other)
{
    capacity = other.capacity;
    current = other.current;
    values = new T[capacity];
    for (int i = 1; i <= current; i++)
        values[i] = other.values[i];
}

template <class T>
void CompleteBinTree<T>::clean()
{
    delete[] values;
}

template <class T>
void CompleteBinTree<T>::addElement(T const& x)
{
    if (current == capacity-1)
        resize();
    values[current++] = x;
}

template <class T>
int CompleteBinTree<T>::leftChildIndex(int index) const
{
    if (2*index <= current)
        return 2*index;
    return -1;
}

template <class T>
int CompleteBinTree<T>::rightChildIndex(int index) const
{
    if (2*index + 1 <= current)
        return 2*index + 1;
    return -1;
}

template <class T>
bool CompleteBinTree<T>::empty() const
{
    return current == 0;
}

template <class T>
void CompleteBinTree<T>::create()
{
    char c;
    do
    {
        int x;
        cout << "Enter element: ";
        cin >> x;
        addElement(x);
        cout << "Next element y/n? ";
        cin >> c;
    } while (c == 'y');
}

template <class T>
void CompleteBinTree<T>::printBFS()
{
    for (int i = 0; i < current; i++)
        cout << values[i] << " ";
    cout << endl;
}


bool inVector(vector<int> arr, int n, const int element)
{
    vector<int>::iterator it = find(arr.begin(), arr.end(), element);
    if(it != arr.end())
        return true;

    return false;
}

template<class T>
void myerase(vector<T>& vec, int index)
{
    for(unsigned i = index+1; i < vec.size()-1; i++)
        vec[i-1] = vec[i];
    vec.pop_back();
}

template<class T>
void fillTree(vector<T> leaves, CompleteBinTree<T>& tree)
{
    int size = leaves.size();
    vector<int> usedPositions;
    for(int i = 0; i < size; i++)
        usedPositions.push_back(-1);

    int i = 0;
    srand(time(NULL));
    while(i < leaves.size())
    {
        int position = rand() % leaves.size();
        if(!inVector(usedPositions, size, position))
        {
            usedPositions[i] = position;
            i++;
            tree.addElement(leaves[position]);
        }
    }
}

int main()
{
    vector<int> vec;

    for(int i = 0; i < 10; i++)
        vec.push_back(i);

    CompleteBinTree<int> tree;
    fillTree(vec, tree);

    tree.printBFS();
    return 0;
}