private string SearchNode(PrTreeNode <T> current, T data)
{
switch (current.Compare(Convert.ToInt32(data)))
{
case -1:
if (current.Rtag)
{
return(current + " " + SearchNode(current.Rigth, data));
}
else
{
throw new Exception($"No node with {data}");
};
case 1:
if (current.Ltag)
{
return(current + " " + SearchNode(current.Left, data));
}
else
{
throw new Exception($"No node with {data}");
};
case 0:
return(current + " ");
default:
throw new Exception("Compare error");
}
}
private void AddNode(PrTreeNode <T> parent, PrTreeNode <T> priv, PrTreeNode <T> next, T data)
{
switch (parent.Compare(Convert.ToInt32(data)))
{
//rigth
case -1:
if (parent.Rtag)
{
AddNode(parent.Rigth, parent, next, data);
}
else
{
parent.Rigth = new PrTreeNode <T>(data, parent, next);
parent.Rtag = true;
}
break;
//left
case 1:
if (parent.Ltag)
{
AddNode(parent.Left, priv, parent, data);
}
else
{
parent.Left = new PrTreeNode <T>(data, priv, parent);
parent.Ltag = true;
}
break;
}
}
private void RemoveNode(PrTreeNode <T> current, PrTreeNode <T> parent, PrTreeNode <T> priv, PrTreeNode <T> next, T data)
{
switch (current.Compare(Convert.ToInt32(data)))
{
case -1:
if (current.Rtag)
{
RemoveNode(current.Rigth, current, current, next, data);
}
else
{
throw new Exception($"No node with {data}");
}
break;
case 1:
if (current.Ltag)
{
RemoveNode(current.Left, current, priv, current, data);
}
else
{
throw new Exception($"No node with {data}");
}
break;
case 0:
//нет детей
if (!current.Ltag && !current.Rtag)
{
switch (parent.Compare(Convert.ToInt32(current.GetData())))
{
case -1:
parent.Rtag = false;
parent.Rigth = current.Rigth;
break;
case 1:
parent.Ltag = false;
parent.Left = current.Left;
break;
}
if (!priv.Rtag && priv != parent)
{
priv.Rigth = parent;
}
if (!next.Ltag && next != parent)
{
next.Left = parent;
}
}
//только праый ребенок
else if (current.Rtag && !current.Ltag)
{
switch (parent.Compare(Convert.ToInt32(current.GetData())))
{
case -1:
if (parent == _head)
{
parent.Left = current.Rigth;
if (!current.Rtag)
{
parent.Ltag = false;
}
}
else
{
parent.Rigth = current.Rigth;
if (!current.Rtag)
{
parent.Rtag = false;
}
}
break;
case 1:
parent.Left = current.Rigth;
if (!current.Rtag)
{
parent.Ltag = false;
}
break;
}
if (!priv.Rtag && priv != parent)
{
priv.Rigth = current.Rigth;
}
current.Rigth.Left = parent;
}
//только левый ребенок
else if (current.Ltag && !current.Rtag)
{
switch (parent.Compare(Convert.ToInt32(current.GetData())))
{
case -1:
if (parent == _head)
{
parent.Left = current.Left;
if (!current.Ltag)
{
parent.Ltag = false;
}
}
else
{
parent.Rigth = current.Left;
if (!current.Ltag)
{
parent.Rtag = false;
}
}
break;
case 1:
parent.Left = current.Left;
if (!current.Ltag)
{
parent.Ltag = false;
}
break;
}
current.Left.Rigth = parent;
if (!next.Ltag && next != parent)
{
next.Left = current.Left;
}
}
//есть два ребенка
else
{
var replacement = parent.Left;
while (replacement.Rtag)
{
replacement = replacement.Rigth;
}
Remove(replacement.GetData());
current.SetData(replacement.GetData());
}
break;
}
}