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itnearyTicket.java
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47 lines (45 loc) · 1.16 KB
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import java.util.*;
class itnearyTicket {
public static void main(String[] args)
{
Scanner in = new Scanner(System.in);
int n = in.nextInt();
Map<String, String> tickets = new HashMap<String, String>();
for(int i = 0; i < n; i++)
{
tickets.put(in.next(), in.next());
in.nextLine();
}
Map<String, String> rev = new HashMap<String, String>();
//rev map
for(String e : tickets.keySet())
{
rev.put(tickets.get(e),e);
}
for(String s : rev.keySet())
{
System.out.print(s+" "+rev.get(s));
}
String s=null;
for(String e : tickets.keySet())
{
if(!rev.containsKey(e))
{
s=e;
break;
}
}
if(s==null)
{
System.out.println("Invalid");
return;
}
System.out.print(s+" ");
String to=tickets.get(s);
while(to!=null)
{
System.out.print(to+" ");
to=tickets.get(to);
}
}
}