#include <iostream>
#include <vector>
 
 struct ResourceFootprint {
    int power;
    int water;
};
 
int main()
{
    ResourceFootprint ice_well = {-100, +50};
    ResourceFootprint solar_array = {+150, 0};
 
    std::vector<ResourceFootprint> buildings;
    buildings.push_back(ice_well);
    buildings.push_back(ice_well);
    buildings.push_back(solar_array);
    buildings.push_back(solar_array);
 
    ResourceFootprint total = {0, 0};
    for (const ResourceFootprint& r : buildings)
    {
        total.power += r.power;
        total.water += r.water;
    }
 
    std::cout << "P: " << total.power << ", W: " << total.water << "\n";
 
    return 0;
}
 

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