public int Level; // глубина узла
public myBSTNode(int key, myBSTNode parent)
{
NodeKey = key;
Parent = parent;
LeftChild = null;
RightChild = null;
}
public bool IsBalanced(myBSTNode root_node)
{
if (root_node == null)
{
return(true);
}
if (root_node.LeftChild == null && root_node.RightChild == null)
{
return(true);
}
var leftBalanced = IsBalanced(root_node.LeftChild);
var rightBalanced = IsBalanced(root_node.RightChild);
var leftDepth = GetMaxDepth(root_node, false);
var rightDepth = GetMaxDepth(root_node, true);
var correctLeftRigthDepth = Math.Abs(leftDepth - rightDepth) <= 1;
return(leftBalanced && rightBalanced && correctLeftRigthDepth);
}
private void RecursiveMaxDepthCheck(myBSTNode node, int currentDepth, ref int maxDepth)
{
if (node.LeftChild == null && node.RightChild == null)
{
if (maxDepth < currentDepth)
{
maxDepth = currentDepth;
}
}
if (node.LeftChild != null)
{
RecursiveMaxDepthCheck(node.LeftChild, currentDepth + 1, ref maxDepth);
}
if (node.RightChild != null)
{
RecursiveMaxDepthCheck(node.RightChild, currentDepth + 1, ref maxDepth);
}
}
private myBSTNode CreateNode(int[] array, int level, myBSTNode parent)
{
var center = array.Length / 2;
var node = new myBSTNode(array[center], parent);
node.Level = level;
if (center == 0)
{
return(node);
}
var left = new int[center];
var right = new int[center];
Array.Copy(array, left, center);
Array.Copy(array, center + 1, right, 0, center);
node.LeftChild = CreateNode(left, level + 1, node);
node.RightChild = CreateNode(right, level + 1, node);
return(node);
}
private int GetMaxDepth(myBSTNode node, bool isRight)
{
if (isRight)
{
if (node.RightChild == null)
{
return(0);
}
int maxDepth = 0;
RecursiveMaxDepthCheck(node.RightChild, 1, ref maxDepth);
return(maxDepth);
}
else
{
if (node.LeftChild == null)
{
return(0);
}
int maxDepth = 0;
RecursiveMaxDepthCheck(node.LeftChild, 1, ref maxDepth);
return(maxDepth);
}
}
public void GenerateTree()
{
// создаём дерево с нуля из массива BSTArray
Root = CreateNode(BSTArray, 1, null);
}
public int [] BSTArray; // временный массив для ключей дерева
public myBalancedBST()
{
Root = null;
}
