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#include <iostream>#include <string>#include <sstream>#include <fstream>#include <vector>#include <map>using namespace std;class Node {	char _name;	map<char, Node*> _links;  public:	Node();	Node(char name);	void linkNode(char edge, Node* node);};Node::Node(char name) {	_name = name;}void Node::linkNode(char edge, Node* node) {	_links[edge] = node;}void addNodes(vector<Node*>* nodes, char edge, Node * node1, Node * node2) {	node1->linkNode(edge, node2);	node2->linkNode(edge, node1);	nodes->push_back(node1);	nodes->push_back(node2);}int main() {	ostringstream output;	vector<Node*> nodes;	while (true) {		cout << "graphprog> ";		string cmd;		char n1, n2, edge;		cin >> cmd;		if (cmd == "add") {			cin >> edge >> n1 >> n2;				output << edge << " " << n1 << " " << n2 << endl;			addNodes(&nodes, edge, new Node(n1), new Node(n2)); 		}		else if (cmd == "write") {			string outfileName;			cin >> outfileName;			ofstream outfile(outfileName.c_str());			outfile << output.str();		}		else if (cmd == "show") {						//cout << output.str();		}		else if (cmd == "quit") {			break;		}		else {			cerr << "Invalid command." << endl;		}	}	return 0;}