87 lines
1.9 KiB
C++
87 lines
1.9 KiB
C++
#include <algorithm>
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#include <cstdlib>
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#include <iostream>
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#include <limits>
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#include <map>
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#include <numeric>
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#include <set>
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#include <string>
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#include <vector>
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struct State
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{
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std::set<unsigned long> weights_;
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explicit State(unsigned long w) { weights_.insert(w); }
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std::size_t cost() const { return weights_.size(); }
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unsigned long qe() const
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{
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return std::accumulate(weights_.begin(), weights_.end(), 1UL,
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[](unsigned long l, unsigned long w) { return l * w; });
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}
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unsigned long weight() const
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{
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return std::accumulate(weights_.begin(), weights_.end(), 0UL,
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[](unsigned long l, unsigned long w) { return l + w; });
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}
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bool operator==(State const& rhs) const { return weights_ == rhs.weights_; }
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bool operator<(State const& rhs) const
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{
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if (cost() < rhs.cost()) {
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return true;
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}
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if (cost() == rhs.cost()) {
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return qe() < rhs.qe();
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}
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return false;
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}
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};
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int main()
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{
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std::vector<unsigned long> weights;
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std::string line;
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while (std::getline(std::cin, line)) {
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weights.emplace_back(std::stoul(line));
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}
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std::set<State> states;
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unsigned long target_weight;
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for (auto w : weights) {
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states.insert(State{w});
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target_weight += w;
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}
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target_weight /= 4;
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while (!states.empty()) {
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auto it = states.begin();
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State current(*it);
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states.erase(it);
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if (current.weight() == target_weight) {
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std::cout << "Cost " << current.cost() << ", qe " << current.qe() << '\n';
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return 0;
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}
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if (current.weight() > target_weight) {
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continue;
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}
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for (auto w : weights) {
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if (current.weights_.find(w) == current.weights_.end()) {
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auto next{current};
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next.weights_.insert(w);
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if (states.find(next) == states.end()) {
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states.insert(next);
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}
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}
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}
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}
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std::cout << "It went wrong somewhere!\n";
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return 1;
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} |