3D-Projects/OfficeShelf/zuschnitt_cpp/zuscnitt/main.cpp

#include <cassert>
#include <ctime>
#include <iostream>
#include <memory>
#include <vector>

bool intvectcontains(const std::vector<int> &heystack, int needle) {
    for (auto i: heystack) {
        if (i == needle) return true;
    }
    return false;
}


class Cut {

public:
    Cut(int l) {
        this->Length = l;
    }

    int length() const {
        return this->Length;
    }

private:
    Cut(Cut &); // deny copying
    int Length = 0;
};


class CutableRod {
public:
    CutableRod() {
        this->Length = 6000;
        this->CutThickness = 9;
        this->Remainder = this->Length;
    }

    CutableRod(CutableRod &other) {
        this->Length = other.Length;
        this->CutThickness = other.CutThickness;
        this->Remainder = other.Remainder;
        for (auto c : other.Cuts) {
            this->Cuts.push_back(c);
        }
    }

    void addCut(std::shared_ptr<const Cut> cut) {
        assert(this->canAddCut(cut));
        this->Cuts.push_back(cut);
        this->Remainder -= cut->length();
        this->Remainder -= this->CutThickness;
    }

    bool canAddCut(std::shared_ptr<const Cut> cut) {
        return this->Remainder >= cut->length();
    }

    std::vector<std::shared_ptr<const Cut>> cuts() {
        return this->Cuts;
    }

    int remainder() {
        return this->Remainder;
    }

    int variety(void) {
        std::vector<int> lengths;
        for (auto cut : this->Cuts) {
            if (!intvectcontains(lengths, cut->length()))
                lengths.push_back(cut->length());
        }
        return lengths.size();
    }

private:
    int Length = 0;
    int CutThickness = 0;
    int Remainder = 0;
    std::vector<std::shared_ptr<const Cut>> Cuts;
};


class CutSolution {
public:
    CutSolution() {
    }

    CutSolution(CutSolution &other) {
        for (auto r_other: other.Rods) {
            auto r_copy = std::make_shared<CutableRod>(*r_other);
            this->Rods.push_back(r_copy);
        }
    }

    void addCut(std::shared_ptr<const Cut> cut) {

        // add rod if empty
        if (this->Rods.empty()) {
            auto new_rod = std::make_shared<CutableRod>();
            this->Rods.push_back(new_rod);
        }

        // add rod if cannot add cut
        if (!this->Rods.back()->canAddCut(cut)) {
            auto new_rod = std::make_shared<CutableRod>();
            this->Rods.push_back(new_rod);
        }

        // add cut to last rod
        this->Rods.back()->addCut(cut);
    }

    bool isBetterThan(const CutSolution &other) {

        // compare rod amount
        int my_r = this->rods();
        int other_r = other.rods();
        if (my_r != other_r) {
            return my_r < other_r;

        // compare remainder amount
        } else {
            int my_r = this->remainder();
            int other_r = other.remainder();
            if (my_r != other_r) {
                return my_r < other_r;

            // compare variety amount
            } else {
                int my_v = this->variety();
                int other_v = other.variety();
                if (my_v != other_v) {
                    return my_v < other_v;

                // both solutions are equal
                } else {
                    return false;
                }
            }
        }
    }

    void print(bool shortform=false) {
        if (!shortform) {
            std::cout << std::endl << "Solution" << std::endl;
            for (auto it = this->Rods.begin(); it != this->Rods.end(); ++it) {
                int pos = std::distance(this->Rods.begin(), it);
                std::cout << "Rod " << pos << ": ";
                for (auto c: (*it)->cuts()) {
                    std::cout << c->length() << " ";
                }
                std::cout << "(-" << (*it)->remainder() << ")" << std::endl;
            }
        }

        std::cout << "Rods=" << this->rods();
        std::cout << ", Remainder=" << this->remainder();
        std::cout << ", Variety=" << this->variety();
        std::cout << std::endl;
    }

    int remainder() const {
        int ret = 0;
        for (auto r: this->Rods) {
            ret += r->remainder();
        }
        return ret;
    }

    int rods() const {
      return (int) this->Rods.size();
    }

    int variety() const {
        int ret = 0;
        for (auto r: this->Rods) {
            int v = r->variety();
            if (v > 1) ret += v;
        }
        return ret;
    }

private:
    std::vector<std::shared_ptr<CutableRod>> Rods;
};


class CutRequest {
public:
    CutRequest() {}

    void add(int amount, int length) {
        for (int i=0; i < amount; ++i) {
            auto c = std::make_shared<Cut>(length);
            this->Cuts.push_back(c);
        }
    }

    void arrangeCuts() {
        auto time_start = std::time(nullptr);
        auto solution = CutSolution();
        solution = this->arrangeCutIteration(solution, this->Cuts);
        solution.print();
        auto time_end = std::time(nullptr);
        std::cout << "Duration: " << (time_end - time_start) << std::endl;
    }

    std::vector<std::shared_ptr<const Cut>> cuts() {
        return this->Cuts;
    }

private:
    std::vector<std::shared_ptr<const Cut>> Cuts;

    CutSolution arrangeCutIteration(CutSolution &current_solution,
                                    std::vector<std::shared_ptr<const Cut>> remaining_cuts) {

        if (remaining_cuts.empty()) return current_solution;
        CutSolution best_solution;
        bool ret_is_defined = false;

        std::vector<int> tested_lengths;
        for (int idx_try=0; idx_try < remaining_cuts.size(); ++idx_try) {
            auto cut = remaining_cuts.at(idx_try);

            // avaoid testing same length again
            // if (std::find(tested_lengths.begin(), tested_lengths.end(), cut->length()) != tested_lengths.end()) continue;
            if (intvectcontains(tested_lengths, cut->length())) continue;
            tested_lengths.push_back(cut->length());

            // create temporary solution for trial
            CutSolution trysol(current_solution);

            // add cut to temporary solution
            trysol.addCut(cut);

            // create list of remaining other cuts
            std::vector<std::shared_ptr<const Cut>> remaining_cuts_without_try;
            remaining_cuts_without_try.clear();
            for (int idx_other=0; idx_other < remaining_cuts.size(); ++idx_other) {
                if (idx_other == idx_try) continue;

                auto cut_other = remaining_cuts.at(idx_other);
                remaining_cuts_without_try.push_back(cut_other);
            }

            // solve for tried remaining cuts
            trysol = this->arrangeCutIteration(trysol, remaining_cuts_without_try);

            // keep best solution
            if (!ret_is_defined || trysol.isBetterThan(best_solution)) {
                best_solution = trysol;
                if (current_solution.rods() == 0) {
                    std::cout << "Better Solution: ";
                    best_solution.print(true);
                }
                ret_is_defined = true;
            }
        }

        return best_solution;
    }

};


int main(void) {
    CutRequest cr;
    cr.add(8, 660);
    cr.add(16, 620);
    cr.add(1, 905);
    cr.add(2, 442);
    cr.add(2, 848);
    cr.add(4, 414);
    cr.arrangeCuts();

//    // manual solve
//    CutSolution cs;
//    for (auto c: cr.cuts()) {
//        cs.addCut(c);
//    }
//    cs.print();

    return 0;
}