#include <iostream>

using namespace std;

/*
    a, b, c - сторони трикутрика
    Triangle (float x, float y, float z) - констуктор ініціалізації списком
    Triangle(const Triangle &src) - конструктор копіювання
    friend Triangle operator - (const Triangle &a, const Triangle &b) - оператор - як дружня функція
    bool operator > (Triangle &a) - оператор >
    void set(char q) - SET
    void show(char q) - SHOW
    float calcP() { return a + b + c; } - обчислення периметра
    void showCond(char q, float p) - друкування інформації з умовою що P() > p
*/


class Triangle {
    float a, b, c;

    public:
        Triangle() { a = b = c = 0; cout << "Used empty constructor" << endl;}

        Triangle (float x, float y, float z) : a(x), b(y), c(z) { cout << "Used list constructor" << endl; }

        Triangle(const Triangle &src) { a = src.a; b = src.b; c = src.c; cout << "Used copy constructor" << endl; }

        friend Triangle operator - (const Triangle &a, const Triangle &b);

        bool operator > (Triangle &a) { return (calcP() > a.calcP()); }

        void set(char q);

        void show(char q);

        float calcP() { return a + b + c; }

        void showCond(char q, float p) {
            if (calcP() > p) show(q);
            else cout << "Triangle " << q << " perimeter < p" << endl << endl;
        }
};

int main() {
    Triangle C1;

    C1.set('1');

    Triangle C2(3, 4, 5);

    C2.show('2');

    Triangle C3 = C2;

    C3.show('3');

    Triangle C4;

    C4 = C1 - C2;

    C4.show('4');

    cout << "C4 > C1: " << (C4 > C1) << endl << endl;

    cout << "P of tiangle C1 = " << C1.calcP() << endl;
    cout << "P of tiangle C2 = " << C2.calcP() << endl;
    cout << "P of tiangle C3 = " << C3.calcP() << endl;
    cout << "P of tiangle C4 = " << C4.calcP() << endl;

    int n;

    cout << endl << "Enter count of objects: ";
    cin >> n;

    Triangle objs[n];

    for (int i = 0; i < n; i++) {
        objs[i].set(i + '0');
    }

    float p;
    cout << endl << "Enter p: ";
    cin >> p;

    cout << endl << "Result: " << endl;

    for (int i = 0; i < n; i++) {
        cout << "P of triangle " << i + 1 << " = " << objs[i].calcP() << endl;
        objs[i].showCond(i + '0', p);
    }

    return 0;
}

void Triangle :: set(char q) {
    cout << "Enter info about triangle " << q << ":" << endl;
    cout << "\ta: ";
    cin >> a;
    cout << "\tb: ";
    cin >> b;
    cout << "\tc: ";
    cin >> c;
    cout << endl;
}

void Triangle :: show(char q) {
    cout << "Info about triangle " << q << ":" << endl;
    cout << "\ta: " << a << endl;
    cout << "\tb: " << b << endl;
    cout << "\tc: " << c << endl;
    cout << endl;
}

Triangle operator - (const Triangle &a, const Triangle &b) {
    Triangle c(a.a - b.a, a.b - b.b, a.c - b.c);
    return c;
}