birthday code

#include <iostream>
using namespace std;
class CandyBox {
    int cnt;
    int* candies;
public:
    CandyBox() {
        this->candies = NULL;
        this->cnt = 0;
    }
    ~CandyBox() {
        delete [] this->candies;
    }
    CandyBox(const CandyBox& c) {
        this->cnt = c.cnt;
        for (int i = 0; i < cnt; i++) {
            this->candies[i] = c.candies[i];
        }
    }

    void read() {
        cin >> this->cnt;
        if (this->candies) {
            delete [] this->candies;
        }
        this->candies = new int [this->cnt];
        for (int i = 0; i < this->cnt; ++i) {
            cin >> this->candies[i];
        }
    }
    void print() {
        for (int i = 0; i < this->cnt; ++i) {
            cout << this->candies[i] << " ";
        }
    }
    bool in(int data[], int size, int value) {
        for (int i = 0; i < size; ++i) {
            if (data[i] == value) {
                return true;
            }
        }
        return false;
    }
    int varietes() {
        int *data = new int[this->cnt];
        int count = 0;
        for (int i = 0; i < this->cnt; ++i) {
            if (!in(data, count, this->candies[i])) {
                data[count++] = this->candies[i];
            }
        }
        delete [] data;
        return count;
    }
    int size() {
        return this->cnt;
    }
    int& at(int index) {
        for (int i = 0; i <= index; i++) {
            if (i == index) {
                return this->candies[i];
            }
        }
    }
};

CandyBox Arcady_process(CandyBox b) {
    int temp_ar[b.size()];
    int temp_cnt;
    for (int i = 0; i < b.size(); i++) {
        if (!(b.at(i) % 2 == 0)) {
            temp_cnt++;
            temp_ar[temp_cnt] = i;
        }
    }
    for (int i = 1; i <= b.size(); i++) {
        if (i % 2 == 0) {
            b.at(temp_ar[i]) = 0;
        }
    }
    return b;
};

int main() {
    CandyBox c;
    c.read();
    Arcady_process(c);
    c.print();
    return 0;
}