Tecnick

#include <iostream>
#include <ctime>
using namespace std;

struct Point {
    int x, y;
    Point() {}
    Point(Point& p) {
        x = p.x;
        y = p.y;
    }
    Point(int x, int y) {
        this->x = x;
        this->y = y;
    }
};

struct PointCollectionElement {
    Point* info;
    PointCollectionElement *next;
    PointCollectionElement(int x, int y) {
        info = new Point(x, y);
        next = nullptr;
    }
    PointCollectionElement(PointCollectionElement& p) {
        info = p.info;
        next = nullptr;
    }
    ~PointCollectionElement() {
        delete info; info = 0;
    }
};

class PointCollection {
    private:
        PointCollectionElement* first;
        PointCollectionElement* last;
        PointCollectionElement* cur;

    public:
        PointCollection() {
            last = first = cur = nullptr;
        }
        PointCollection(PointCollection& p) {
            last = first = cur = nullptr;
            PointCollectionElement* temp = p.first;
            while(temp != nullptr) {
                int x = temp->info->x; int y = temp->info->y;
                addPoint(x, y);
                if(temp == p.cur) cur = last;
                temp = temp->next;
            }
        }
        ~PointCollection() {
            while(first != nullptr) {
                PointCollectionElement* temp = first;
                first = first->next;
                delete temp;
            }
        }
        void addPoint(int x, int y) {
            if(first == nullptr) {
                cur = first = last = new PointCollectionElement(x, y);
            } else {
                last = (last->next = new PointCollectionElement(x, y));
            }
        }

        void reset() {
            cur = first;
        }

        Point* nextPoint() {
            if(cur == nullptr) {
                return nullptr;
            }
            Point* info = cur->info;
            cur = cur->next;
            return info;
        }
};

void process0(PointCollection& points, int n = 3) {
    while(n-- > 0) {
        points.addPoint(rand() % 101, rand() % 101);
    }
}

//здесь нельзя менять сигнатуру метода (в том числе добавлять &, * и т.д.)
void process1(PointCollection points) {
    Point* cur;
    while((cur = points.nextPoint()) != nullptr) {
        cout << " | " << (cur->x * cur->x + cur->y * cur->y) << " | ";
    }
    cout << endl << endl;
}

//здесь нельзя менять сигнатуру метода (в том числе добавлять &, * и т.д.)
void process2(PointCollection points) {
    Point* cur;
    while((cur = points.nextPoint()) != nullptr) {
        cout << " | " << cur->x << " " << cur->y << " | ";
    }
    cout << endl << endl;
}

int main() {
    srand(time(0));
    PointCollection points1, points2;
    process0(points1);
    process1(points1);
    process0(points2);
    process1(points2);
    process2(points1);
    process2(points2);
    return 0;
}