#include <iostream>
#include <vector>
#include <algorithm>
#include <random>

bool WrongCompare(int a, int b) {
    return a <= b; // UB
}

void f(std::mt19937& gen) {
    std::uniform_int_distribution<> uid(0, 10);
    std::vector<int> items(30);

    std::cout << "input: ";
    for (auto& value : items) {
        value = uid(gen);
        std::cout << value << " ";
    }
    std::cout << std::endl;

    sort(items.begin(), items.end(), WrongCompare);

    std::cout << "result: ";
    for (const int x : items) {
        std::cout << x << " ";
    }
    std::cout << std::endl;
}

int f(int x);

int g() {
    return f(1);
}

std::vector<int> z() {
    return {};

    return std::vector<int>();

}


std::pair<int, double> func() {
    return {1, 3.14};
    return std::make_pair(1, 3.14);
    return std::pair<int, double>(1, 3.14);
}

std::tuple<int, char, double> func2() {
    std::tuple<int, char, double> z(1, 'a', 3.14);
    std::get<0>(z) = 10;
    return z;
}

struct Type {
    double y;
    int z;
};

Type func3() {
    return Type{1, 3.14};
}

std::vector<int> func4() {
    return {1,2,3,4};
}

int main() {

    auto [x, y] = func();
    auto [q, w, y] = func2();
    auto [p, z] = func3();
    //auto [a1,a2,a3,a4] = func4(); CE


}