static IEnumerable <CodePair> GetLeaves(Node node, string currentString)
{
if (node.IsLeaf())
{
yield return(new CodePair()
{
ch = node.ch,
code = currentString
});
}
else
{
foreach (var leaf in GetLeaves(node.left, currentString + "0"))
{
yield return(leaf);
}
foreach (var leaf in GetLeaves(node.right, currentString + "1"))
{
yield return(leaf);
}
}
}
