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#ifndef GRAPH_H
#define GRAPH_H
#include <map>
#include <vector>
class Graph {
public:
Graph() : graph_() {}
void add_vertex(int vertex) {
graph_[vertex] = std::vector<int>();
}
void add_edge(int from, int to) {
graph_[from].push_back(to);
}
std::set<int> get_vertices() {
std::set<int> vertices;
for (auto vertex : graph_) {
vertices.insert(vertex.first);
}
return vertices;
}
std::vector<int> const& get_neighbors(int vertex) {
return graph_[vertex];
}
private:
std::map<int, std::vector<int>> graph_;
};
#endif
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