private static void ExtractMessagesFromTree(Node root, SortedSet<string> possibleMessages, List<char> currentMessage)
{
if (root.Children.Count == 0 && currentMessage.Count != 0)
{
possibleMessages.Add(string.Join("", currentMessage));
}
foreach (var node in root.Children)
{
var newCurrentMessage = new List<char>(currentMessage);
newCurrentMessage.Add(codesOfLetters[node.Value]);
ExtractMessagesFromTree(node, possibleMessages, newCurrentMessage);
}
}
private static void BuildTree(string message, Node root, int left = 0)
{
var builder = new StringBuilder();
for (int i = left; i < message.Length; i++)
{
builder.Append(message[i]);
var currentCode = long.Parse(builder.ToString());
if (codesOfLetters.ContainsKey(currentCode))
{
var nodeToAppend = new Node(currentCode);
root.AddChild(nodeToAppend);
BuildTree(message, nodeToAppend, i + 1);
}
}
}
static void Main()
{
//var reader = new StreamReader("../../input/3.txt");
//Console.SetIn(reader);
var message = Console.ReadLine();
var cypher = Console.ReadLine();
var currentCode = new StringBuilder();
for (int i = 0; i < cypher.Length; i++)
{
if (char.IsLetter(cypher[i]) && currentCode.Length != 0)
{
codesOfLetters.Add(
int.Parse(currentCode.ToString().Substring(1, currentCode.Length - 1)),
currentCode[0]);
lettersToCodes.Add(
currentCode[0],
int.Parse(currentCode.ToString().Substring(1, currentCode.Length - 1)));
currentCode.Clear();
}
currentCode.Append(cypher[i]);
}
codesOfLetters.Add(
int.Parse(currentCode.ToString().Substring(1, currentCode.Length - 1)),
currentCode[0]);
lettersToCodes.Add(
currentCode[0],
int.Parse(currentCode.ToString().Substring(1, currentCode.Length - 1)));
var possibleMessages = new SortedSet<string>();
var root = new Node(-1);
BuildTree(message, root);
ExtractMessagesFromTree(root, possibleMessages, new List<char>());
var validMessages = new SortedSet<string>();
foreach (var m in possibleMessages)
{
var builder = new StringBuilder();
foreach (var letter in m)
{
if (lettersToCodes.ContainsKey(letter))
{
builder.Append(lettersToCodes[letter]);
}
else
{
break;
}
}
if (builder.ToString() == message)
{
validMessages.Add(m);
}
}
Console.WriteLine(validMessages.Count);
Console.WriteLine(string.Join(Environment.NewLine, validMessages));
}
public void AddChild(Node node)
{
this.Children.Add(node);
}