Zadatak 9

#include <iostream>
#include <functional>

std::function<double(double)>plus2(double x) {
    return [x] (double y) {return x + y;};
}
std::function<std::function<double(double)>(double)>plus3(double x) {
    return [x] (double y) {return [x, y] (double z) {return x+y+z;};};
}
int main () {
    std::cout << plus2(10)(4)<<std::endl;
    std::cout << plus3(1)(2)(3)<<std::endl;
    return 0;
}