### Tree Based Common problems and patterns

Find the height of the tree. public class BinaryTreeHeight { public static int heightOfBinaryTree (TreeNode root) { if (root == null ) { return - 1 ; // Height of an empty tree is -1 } int leftHeight = heightOfBinaryTree(root.left); int rightHeight = heightOfBinaryTree(root.right); // Height of the tree is the maximum of left and right subtree heights plus 1 for the root return Math.max(leftHeight, rightHeight) + 1 ; } Find the Level of the Node. private static int findLevel (TreeNode root, TreeNode node, int level) { if (root == null ) { return - 1 ; // Node not found, return -1 } if (root == node) { return level; // Node found, return current level } // Check left subtree int leftLevel = findLevel(root.left, node, level + 1 ); if (leftLevel != - 1 ) { return leftLevel; // Node found in t