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Python

Java

class TreeNode:
    def __init__(self, data):
        self.data = data
        self.left = None
        self.right = None

def inOrderTraversal(node):
    if node is None:
        return
    inOrderTraversal(node.left)
    print(node.data, end=", ")
    inOrderTraversal(node.right)

def minValueNode(node):
    current = node
    while current.left is not None:
        current = current.left
    return current

def delete(node, data):
    if not node:
        return None

if data < node.data:
        node.left = delete(node.left, data)
    elif data > node.data:
        node.right = delete(node.right, data)
    else:
        # Node with only one child or no child
        if not node.left:
            temp = node.right
            node = None
            return temp
        elif not node.right:
            temp = node.left
            node = None
            return temp

# Node with two children, get the in-order successor
        node.data = minValueNode(node.right).data
        node.right = delete(node.right, node.data)

return node

root = TreeNode(13)
node7 = TreeNode(7)
node15 = TreeNode(15)
node3 = TreeNode(3)
node8 = TreeNode(8)
node14 = TreeNode(14)
node19 = TreeNode(19)
node18 = TreeNode(18)

root.left = node7
root.right = node15

node7.left = node3
node7.right = node8

node15.left = node14
node15.right = node19

node19.left = node18

# Traverse
inOrderTraversal(root)

# Delete node 15
delete(root,15)

# Traverse
print() # Creates a new line
inOrderTraversal(root)

# Python

#include <stdio.h>
#include <stdlib.h>

typedef struct TreeNode {
    int data;
    struct TreeNode* left;
    struct TreeNode* right;
} TreeNode;

TreeNode* createNode(int data) {
    TreeNode* newNode = (TreeNode*)malloc(sizeof(TreeNode));
    newNode->data = data;
    newNode->left = NULL;
    newNode->right = NULL;
    return newNode;
}

void inOrderTraversal(TreeNode* node) {
    if (node == NULL) {
        return;
    }
    inOrderTraversal(node->left);
    printf("%d, ", node->data);
    inOrderTraversal(node->right);
}

TreeNode* minValueNode(TreeNode* node) {
    TreeNode* current = node;
    while (current && current->left != NULL) {
        current = current->left;
    }
    return current;
}

TreeNode* delete(TreeNode* node, int data) {
    if (node == NULL) {
        return NULL;
    }

if (data < node->data) {
        node->left = delete(node->left, data);
    } else if (data > node->data) {
        node->right = delete(node->right, data);
    } else {
        // Node with only one child or no child
        if (node->left == NULL) {
            TreeNode* temp = node->right;
            free(node);
            return temp;
        } else if (node->right == NULL) {
            TreeNode* temp = node->left;
            free(node);
            return temp;
        }

// Node with two children: Get the inorder successor (smallest in the right subtree)
        TreeNode* temp = minValueNode(node->right);

// Copy the inorder successor's content to this node
        node->data = temp->data;

// Delete the inorder successor
        node->right = delete(node->right, temp->data);
    }
    return node;
}

int main() {
    TreeNode* root = createNode(13);
    root->left = createNode(7);
    root->right = createNode(15);
    root->left->left = createNode(3);
    root->left->right = createNode(8);
    root->right->left = createNode(14);
    root->right->right = createNode(19);
    root->right->right->left = createNode(18);

// Traverse
    inOrderTraversal(root);
    printf("\n"); // Creates a new line

// Delete node 15
    root = delete(root, 15);

// Traverse
    inOrderTraversal(root);
    printf("\n");

return 0;
}

// C

public class Main {

public static class TreeNode {
        int data;
        TreeNode left;
        TreeNode right;

TreeNode(int data) {
            this.data = data;
            this.left = null;
            this.right = null;
        }
    }

public static void inOrderTraversal(TreeNode node) {
        if (node == null) {
            return;
        }
        inOrderTraversal(node.left);
        System.out.print(node.data + ", ");
        inOrderTraversal(node.right);
    }

public static TreeNode minValueNode(TreeNode node) {
        TreeNode current = node;
        while (current.left != null) {
            current = current.left;
        }
        return current;
    }

public static TreeNode delete(TreeNode node, int data) {
        if (node == null) {
            return null;
        }

if (data < node.data) {
            node.left = delete(node.left, data);
        } else if (data > node.data) {
            node.right = delete(node.right, data);
        } else {
            // Node with only one child or no child
            if (node.left == null) {
                return node.right;
            } else if (node.right == null) {
                return node.left;
            }

// Node with two children: Get the inorder successor
            node.data = minValueNode(node.right).data;
            node.right = delete(node.right, node.data);
        }
        return node;
    }

public static void main(String[] args) {
        TreeNode root = new TreeNode(13);
        root.left = new TreeNode(7);
        root.right = new TreeNode(15);
        root.left.left = new TreeNode(3);
        root.left.right = new TreeNode(8);
        root.right.left = new TreeNode(14);
        root.right.right = new TreeNode(19);
        root.right.right.left = new TreeNode(18);

// Traverse
        inOrderTraversal(root);
        System.out.println(); // Creates a new line

// Delete node 15
        delete(root, 15);

// Traverse
        inOrderTraversal(root);
    }
}

// Java