int equalStacks(vector<int> h1, vector<int> h2, vector<int> h3) {

    auto ref = [&](){
        std::vector<vector<int>*> v_;
        v_.push_back(&h1);
        v_.push_back(&h2);
        v_.push_back(&h3);
        return v_;
    }();

    int hight[3]{};
    for (auto it : h1) hight[0] += it;
    for (auto it : h2) hight[1] += it;
    for (auto it : h3) hight[2] += it;

    while (true) {
        if (hight[0] == hight[1] && hight[0] == hight[2]) return hight[0];

        int indx = 0;
        if (hight[1] > hight[indx]) indx = 1;
        else if (hight[2] > hight[indx]) indx = 2;
        
        auto el = ref[indx]->front();
        ref[indx]->erase(ref[indx]->begin());
        hight[indx] -= el;
    }

    return hight[0];
}