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#include <iostream>
#include <vector>
using namespace std;
 
string printOrder(vector <string> v)
{
 
	// create graph
	unordered_map <char, vector<char> > graph;
 
	// set of chars
	unordered_set <char> nodes;
	for(string s : v)
	{
		char prev = s[0];
		nodes.insert(s[0]);
		for(int i = 1; i < s.length(); i++)
		{
			graph[prev].push_back(s[i])
			prev = s[i];
			nodes.insert(s[i]);
		}
	}
 
 
	unordered_set <char> vis;
 
	// 1 a 0 t
	// 5 a 2 0 t
 
 
 
	// p 0
 
	// z q p a
 
	// 1 -> a
	// 
 
	string ans = "";
	for(char c : nodes)
	{
		string dfsResult = "";
		if (vis.find(c) == vis.end())
		{
			dfsResult = dfs(c, graph, vis);
		}
 
		ans = dfsResult + ans;
	}
 
}
 
 
int main() {
	// your code goes here
	return 0;
}

prog.cpp: In function ‘std::__cxx11::string printOrder(std::vector<std::__cxx11::basic_string<char> >)’:
prog.cpp:9:2: error: ‘unordered_map’ was not declared in this scope
  unordered_map <char, vector<char> > graph;
  ^~~~~~~~~~~~~
prog.cpp:9:2: note: ‘std::unordered_map’ is defined in header ‘<unordered_map>’; did you forget to ‘#include <unordered_map>’?
prog.cpp:3:1:
+#include <unordered_map>
 using namespace std;
prog.cpp:9:2:
  unordered_map <char, vector<char> > graph;
  ^~~~~~~~~~~~~
prog.cpp:9:17: error: expected primary-expression before ‘char’
  unordered_map <char, vector<char> > graph;
                 ^~~~
prog.cpp:12:2: error: ‘unordered_set’ was not declared in this scope
  unordered_set <char> nodes;
  ^~~~~~~~~~~~~
prog.cpp:12:2: note: ‘std::unordered_set’ is defined in header ‘<unordered_set>’; did you forget to ‘#include <unordered_set>’?
prog.cpp:3:1:
+#include <unordered_set>
 using namespace std;
prog.cpp:12:2:
  unordered_set <char> nodes;
  ^~~~~~~~~~~~~
prog.cpp:12:17: error: expected primary-expression before ‘char’
  unordered_set <char> nodes;
                 ^~~~
prog.cpp:16:3: error: ‘nodes’ was not declared in this scope
   nodes.insert(s[0]);
   ^~~~~
prog.cpp:19:4: error: ‘graph’ was not declared in this scope
    graph[prev].push_back(s[i])
    ^~~~~
prog.cpp:19:4: note: suggested alternative: ‘isgraph’
    graph[prev].push_back(s[i])
    ^~~~~
    isgraph
prog.cpp:26:17: error: expected primary-expression before ‘char’
  unordered_set <char> vis;
                 ^~~~
prog.cpp:41:15: error: ‘nodes’ was not declared in this scope
  for(char c : nodes)
               ^~~~~
prog.cpp:44:7: error: ‘vis’ was not declared in this scope
   if (vis.find(c) == vis.end())
       ^~~
prog.cpp:46:23: error: ‘graph’ was not declared in this scope
    dfsResult = dfs(c, graph, vis);
                       ^~~~~
prog.cpp:46:23: note: suggested alternative: ‘isgraph’
    dfsResult = dfs(c, graph, vis);
                       ^~~~~
                       isgraph
prog.cpp:46:16: error: ‘dfs’ was not declared in this scope
    dfsResult = dfs(c, graph, vis);
                ^~~
prog.cpp:52:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^

Standard output is empty