P56635: Rectangles (1)

#include <iostream>
using namespace std;


struct Rectangle {
    int x_esq, x_dre, y_baix, y_dalt;
};

void llegeix(Rectangle& r) {
    cin >> r.x_esq >> r.x_dre >> r.y_baix >> r.y_dalt;
}

int relacio(const Rectangle& r1, const Rectangle& r2) {
    if (r1.x_esq == r2.x_esq && r1.x_dre == r2.x_dre && r1.y_baix == r2.y_baix && r1.y_dalt == r2.y_dalt) return 4;
    if (r2.x_esq <= r1.x_esq && r2.x_dre >= r1.x_dre && r2.y_baix <= r1.y_baix && r2.y_dalt >= r1.y_dalt) return 1;
    if (r1.x_esq <= r2.x_esq && r1.x_dre >= r2.x_dre && r1.y_baix <= r2.y_baix && r1.y_dalt >= r2.y_dalt) return 2;
    if (r1.y_baix > r2.y_dalt or r2.y_baix > r1. y_dalt or r1.x_esq > r2.x_dre or r2.x_esq > r1.x_dre) return 0;
    else return 3;
}

//Pre:
//Post:
int main() {
    int n;
    Rectangle r1, r2;
    cin >> n;
    while (n != 0) {
        llegeix(r1);
        llegeix(r2);
        if (relacio(r1, r2) == 0) cout <<  "els rectangles no intersecten" << endl;
        else if (relacio(r1, r2) == 1) cout << "el primer rectangle es interior al segon" << endl;
        else if (relacio(r1, r2) == 2) cout << "el segon rectangle es interior al primer" << endl;
        else if (relacio(r1, r2) == 3) cout << "els rectangles intersecten" << endl;
        else if (relacio(r1, r2) == 4) cout << "els rectangles son iguals" << endl;
        --n;
    }
}