Trie Deletion

Here given code implementation process.
/*
C++ program
Trie Deletion
*/
#include <iostream>
#include <string.h>
#define ALPHABETS 26
using namespace std;
class Node {
public:
bool end;
Node *children[ALPHABETS];
Node() {
this->end = false;
for (int i = 0; i < ALPHABETS; ++i) {
this->children[i] = NULL;
}
}
};
class Trie {
public:
Node *root;
Trie() {
this->root = new Node();
}
//Search given text is exist in tire
bool search(string text) {
int length = text.size();
int index = 0;
Node *head = this->root;
for (int level = 0; level < length; level++) {
index = text[level] - 'a';
if (head->children[index] == NULL) {
return false;
}
head = head->children[index];
}
if (head != NULL && head->end == true) {
return true;
} else {
return false;
}
}
void insert(string text) {
int length = text.size();
int index = 0;
Node *head = this->root;
for (int level = 0; level < length; level++) {
index = text[level] - 'a';
if (head->children[index] == NULL) {
head->children[index] = new Node();
}
head = head->children[index];
}
if (head != NULL) {
//indicates end of string
head->end = true;
}
}
bool emptyNode(Node *root) {
for (int i = 0; i < ALPHABETS; i++) {
if (root->children[i] != NULL) {
return false;
}
}
return true;
}
Node *lastNode(string text) {
int length = text.size();
int index = 0;
Node *head = this->root;
for (int level = 0; level < length; level++) {
index = text[level] - 'a';
if (head->children[index] == NULL) {
return NULL;
}
head = head->children[index];
}
if (head != NULL && head->end == true) {
return head;
} else {
return NULL;
}
}
//This method are handle the request of deleted text in trie tree
Node *deleteNode(string text, Node *root, int level) {
if (root != NULL) {
if (level == text.size()) {
if (this->emptyNode(root)) {
return NULL;
}
return root;
}
int index = text[level] - 'a';
root->children[index] = this->deleteNode(text, root->children[index], level + 1);
if (root->end == false && this->emptyNode(root)) {
return NULL;
}
}
return root;
}
void deleteText(string text) {
Node *last = this->lastNode(text);
if (last != NULL) {
if (this->emptyNode(last)) {
this->deleteNode(text, this->root, 0);
} else {
last->end = false;
}
cout << "Delete Text " << text << endl;
} else {
cout << "Not Exist Delete Text String : " << text << endl;
}
}
};
int main() {
Trie obj;
obj.insert("cooky");
obj.insert("cool");
string text = "cooky";
if (obj.search(text)) {
cout << "Exist : " << text << endl;
} else {
cout << "Not Exist : " << text << endl;
}
obj.deleteText("cooky");
if (obj.search(text)) {
cout << "Exist : " << text << endl;
} else {
cout << "Not Exist : " << text << endl;
}
return 0;
}
Output
Exist : cooky
Delete Text cooky
Not Exist : cooky
/*
Java program
Trie Deletion
*/
class Node {
//Indicates end of string
public boolean end;
public Node[] children;
public Node(int size) {
end = false;
children = new Node[size];
}
}
public class Trie {
public int ALPHABETS = 26;
public Node root;
public Trie() {
root = new Node(ALPHABETS);
}
//Search given text is exist in tire
public boolean search(String text) {
//first get the length of text
int length = text.length();
//This variable are used to task find the index location of character
int index = 0;
//get the root node
Node head = root;
for (int level = 0; level < length; level++) {
//Get the index
index = text.charAt(level) - 'a';
if (head.children[index] == null) {
return false;
}
head = head.children[index];
}
if (head != null && head.end == true) {
return true;
} else {
return false;
}
}
public void insert(String text) {
//First get the length of text
int length = text.length();
//This variable are used to task find the index location of character
int index = 0;
//Get the root node
Node head = root;
for (int level = 0; level < length; level++) {
//Get the index
index = text.charAt(level) - 'a';
if (head.children[index] == null) {
//When need to add new Node
head.children[index] = new Node(ALPHABETS);
}
head = head.children[index];
}
if (head != null) {
//indicates end of string
head.end = true;
}
}
public boolean emptyNode(Node root) {
for (int i = 0; i < ALPHABETS; i++) {
if (root.children[i] != null) {
return false;
}
}
return true;
}
//Search given text is exist in tire
public Node lastNode(String text) {
//first get the length of text
int length = text.length();
//This variable are used to task find the index location of character
int index = 0;
//get the root node
Node head = root;
for (int level = 0; level < length; level++) {
//Get the index
index = text.charAt(level) - 'a';
if (head.children[index] == null) {
return null;
}
head = head.children[index];
}
if (head != null && head.end == true) {
return head;
} else {
return null;
}
}
public Node deleteNode(String text, Node root, int level) {
if (root != null) {
//if get last node of string
if (level == text.length()) {
if (emptyNode(root)) {
return null;
}
return root;
}
int index = text.charAt(level) - 'a';
root.children[index] =
deleteNode(text, root.children[index], level + 1);
if (root.end == false && emptyNode(root)) {
return null;
}
}
return root;
}
//This method are handle the request of deleted text in trie tree
public void delete(String text) {
//Get last node of deleted text
Node last = lastNode(text);
if (last != null) {
if (emptyNode(last)) {
//If last node of deleted text is not a part of other text string
deleteNode(text, root, 0);
} else {
last.end = false;
}
System.out.println("Delete Text " + text);
} else {
//When node element are not exist
System.out.println("Not Exist Delete Text String : " + text);
}
}
public static void main(String[] args) {
//Make object
Trie obj = new Trie();
obj.insert("cooky");
obj.insert("cool");
String text = "cooky";
if (obj.search(text)) {
System.out.println("Exist : " + text);
} else {
System.out.println("Not Exist : " + text);
}
obj.delete("cooky");
//After Delete
if (obj.search(text)) {
System.out.println("Exist : " + text);
} else {
System.out.println("Not Exist : " + text);
}
}
}
Output
Exist : cooky
Delete Text cooky
Not Exist : cooky

#Python Code
#Trie Deletion
class Node :
def __init__(self,size) :
self.end = False
self.children = [None] * size
class Trie :
def __init__(self) :
self.ALPHABETS = 26
self.root = Node(self.ALPHABETS)
def search(self,text) :
length = len(text)
index = 0
head = self.root
level = 0
while ( level < length ) :
index = ord(text[level]) - ord('a')
if (head.children[index] == None) :
return False
head = head.children[index]
level += 1
if (head != None and head.end == True) :
return True
else :
return False
def insert(self,text) :
length = len(text)
index = 0
head = self.root
level = 0
while ( level < length ) :
index = ord(text[level]) - ord('a')
if (head.children[index] == None) :
head.children[index] = Node(self.ALPHABETS)
head = head.children[index]
level += 1
if (head != None) :
head.end = True
def emptyNode(self,root) :
i = 0
while ( i < self.ALPHABETS ) :
if (self.root.children[i] != None) :
return False
i += 1
return True
def lastNode(self,text) :
length = len(text)
index = 0
head = self.root
level = 0
while ( level < length ) :
index = ord(text[level]) - ord('a')
if (head.children[index] == None) :
return None
head = head.children[index]
level += 1
if (head != None and head.end == True) :
return head
else :
return None
def deleteNode(self,text, root, level) :
if (self.root != None) :
if (level == len(text)) :
if (self.emptyNode(self.root)) :
return None
return self.root
index = ord(text[level]) - ord('a')
self.root.children[index] = self.deleteNode(text, self.root.children[index], level + 1)
if (self.root.end == False and self.emptyNode(self.root)) :
return None
return self.root
def delete(self,text) :
last = self.lastNode(text)
if (last != None) :
if (self.emptyNode(last)) :
self.deleteNode(text, self.root, 0)
else :
last.end = False
print("Delete Text ", text)
else :
print("Not Exist Delete Text String : ", text)
def main() :
obj = Trie()
obj.insert("cooky")
obj.insert("cool")
text = "cooky"
if (obj.search(text)) :
print("Exist : ", text)
else :
print("Not Exist : ", text)
obj.delete("cooky")
if (obj.search(text)) :
print("Exist : ", text)
else :
print("Not Exist : ", text)
if __name__ == "__main__":
main()
Output
Exist : cooky
Delete Text cooky
Not Exist : cooky
/*
C# program
Trie Deletion
*/
using System;
public class Node {
//Indicates end of string
public Boolean end;
public Node[] children;
public Node(int size) {
end = false;
children = new Node[size];
}
}
public class Trie {
public int ALPHABETS = 26;
public Node root;
public Trie() {
root = new Node(ALPHABETS);
}
//Search given text is exist in tire
public Boolean search(String text) {
//first get the.Length of text
int length = text.Length;
//This variable are used to task find the index location of character
int index = 0;
//get the root node
Node head = root;
for (int level = 0; level < length; level++) {
//Get the index
index = text[level] - 'a';
if (head.children[index] == null) {
return false;
}
head = head.children[index];
}
if (head != null && head.end == true) {
return true;
} else {
return false;
}
}
public void insert(String text) {
//First get the.Length of text
int length = text.Length;
//This variable are used to task find the index location of character
int index = 0;
//Get the root node
Node head = root;
for (int level = 0; level < length; level++) {
//Get the index
index = text[level] - 'a';
if (head.children[index] == null) {
//When need to add new Node
head.children[index] = new Node(ALPHABETS);
}
head = head.children[index];
}
if (head != null) {
//indicates end of string
head.end = true;
}
}
public Boolean emptyNode(Node root) {
for (int i = 0; i < ALPHABETS; i++) {
if (root.children[i] != null) {
return false;
}
}
return true;
}
//Search given text is exist in tire
public Node lastNode(String text) {
//first get the.Length of text
int length = text.Length;
//This variable are used to task find the index location of character
int index = 0;
//get the root node
Node head = root;
for (int level = 0; level < length; level++) {
//Get the index
index = text[level] - 'a';
if (head.children[index] == null) {
return null;
}
head = head.children[index];
}
if (head != null && head.end == true) {
return head;
} else {
return null;
}
}
public Node deleteNode(String text, Node root, int level) {
if (root != null) {
//if get last node of string
if (level == text.Length) {
if (emptyNode(root)) {
return null;
}
return root;
}
int index = text[level] - 'a';
root.children[index] =
deleteNode(text, root.children[index], level + 1);
if (root.end == false && emptyNode(root)) {
return null;
}
}
return root;
}
//This method are handle the request of deleted text in trie tree
public void delete(String text) {
//Get last node of deleted text
Node last = lastNode(text);
if (last != null) {
if (emptyNode(last)) {
//If last node of deleted text is not a part of other text string
deleteNode(text, root, 0);
} else {
last.end = false;
}
Console.WriteLine("Delete Text " + text);
} else {
//When node element are not exist
Console.WriteLine("Not Exist Delete Text String : " + text);
}
}
public static void Main(String[] args) {
//Make object
Trie obj = new Trie();
obj.insert("cooky");
obj.insert("cool");
String text = "cooky";
if (obj.search(text)) {
Console.WriteLine("Exist : " + text);
} else {
Console.WriteLine("Not Exist : " + text);
}
obj.delete("cooky");
//After Delete
if (obj.search(text)) {
Console.WriteLine("Exist : " + text);
} else {
Console.WriteLine("Not Exist : " + text);
}
}
}
Output
Exist : cooky
Delete Text cooky
Not Exist : cooky
<?php
/*
Php program
Trie Deletion
*/
class Node {
public $end;
public $children;
function __construct($size) {
$this->end = false;
$this->children = array_fill(0, $size, NULL);
}
}
class Trie {
public $ALPHABETS = 26;
public $root;
function __construct() {
$this->root = new Node($this->ALPHABETS);
}
public function search($text) {
$length = strlen($text);
$index = 0;
$head = $this->root;
for ($level = 0; $level < $length; $level++) {
$index = ord($text[$level]) - ord('a');
if ($head->children[$index] == null) {
return false;
}
$head = $head->children[$index];
}
if ($head != null && $head->end == true) {
return true;
} else {
return false;
}
}
public function insert($text) {
$length = strlen($text);
$index = 0;
$head = $this->root;
for ($level = 0; $level < $length; $level++) {
$index = ord($text[$level]) - ord('a');
if ($head->children[$index] == null) {
$head->children[$index] = new Node($this->ALPHABETS);
}
$head = $head->children[$index];
}
if ($head != null) {
$head->end = true;
}
}
public function emptyNode($root) {
for ($i = 0; $i < $this->ALPHABETS; $i++) {
if ($this->root->children[$i] != null) {
return false;
}
}
return true;
}
public function lastNode($text) {
$length = strlen($text);
$index = 0;
$head = $this->root;
for ($level = 0; $level < $length; $level++) {
$index = ord($text[$level]) - ord('a');
if ($head->children[$index] == null) {
return null;
}
$head = $head->children[$index];
}
if ($head != null && $head->end == true) {
return $head;
} else {
return null;
}
}
public function deleteNode($text, $root, $level) {
if ($this->root != null) {
if ($level == strlen($text)) {
if ($this->emptyNode($this->root)) {
return null;
}
return $this->root;
}
$index = ord($text[$level]) - ord('a');
$this->root->children[$index] = $this->deleteNode($text, $this->root->children[$index], $level + 1);
if ($this->root->end == false && $this->emptyNode($this->root)) {
return null;
}
}
return $this->root;
}
public function delete($text) {
$last = $this->lastNode($text);
if ($last != null) {
if ($this->emptyNode($last)) {
$this->deleteNode($text, $this->root, 0);
} else {
$last->end = false;
}
echo("Delete Text $text\n");
} else {
echo("Not Exist Delete Text String : $text\n");
}
}
}
function main() {
$obj = new Trie();
$obj->insert("cooky");
$obj->insert("cool");
$text = "cooky";
if ($obj->search($text)) {
echo ("Exist : $text\n");
} else {
echo("Not Exist : $text \n");
}
$obj->delete("cooky");
if ($obj->search($text)) {
echo("Exist : $text\n");
} else {
echo("Not Exist : $text\n");
}
}
main();
Output
Exist : cooky
Delete Text cooky
Not Exist : cooky
#
# Ruby program
# Trie Deletion
#
class Node
attr_reader :end, :children
attr_accessor :end, :children
def initialize(size)
@end = false
@children = Array.new(size){nil}
end
end
class Trie
attr_reader :ALPHABETS, :root
attr_accessor :ALPHABETS, :root
def initialize()
@ALPHABETS = 26
@root = Node.new(@ALPHABETS)
end
def search(text)
length = text.length
location = 0
head = @root
level = 0
while ( level < length ) do
location = text[level].ord-'a'.ord
if (head.children[location] == nil)
return false
end
head = head.children[location]
level += 1
end
if (head != nil and head.end == true)
return true
else
return false
end
end
def insert(text)
length = text.length
location = 0
head = @root
level = 0
while ( level < length )
location = text[level].ord-'a'.ord
if (head.children[location] == nil)
head.children[location] = Node.new(@ALPHABETS)
end
head = head.children[location]
level += 1
end
if (head != nil)
head.end = true
end
end
def emptyNode(root)
i = 0
while ( i < @ALPHABETS )
if (@root.children[i] != nil)
return false
end
i += 1
end
return true
end
def lastNode(text)
length = text.length
location = 0
head = @root
level = 0
while ( level < length )
location = text[level].ord-'a'.ord
if (head.children[location] == nil)
return nil
end
head = head.children[location]
level += 1
end
if (head != nil and head.end == true)
return head
else
return nil
end
end
def deleteNode(text, root, level)
if (@root != nil)
if (level == text.length)
if (self.emptyNode(@root))
return nil
end
return @root
end
location = text[level].ord-'a'.ord
@root.children[location] = self.deleteNode(text, @root.children[location], level + 1)
if (@root.end == false and self.emptyNode(@root))
return nil
end
end
return @root
end
def delete(text)
last = self.lastNode(text)
if (last != nil)
if (self.emptyNode(last))
self.deleteNode(text, @root, 0)
else
last.end = false
end
print("Delete Text " + text + "\n")
else
print("Not Exist Delete Text String :" + text + "\n")
end
end
end
def main()
obj = Trie.new()
obj.insert("cooky")
obj.insert("cool")
text = "cooky"
if (obj.search(text))
print("Exist :" + text + "\n")
else
print("Not Exist :" + text + "\n")
end
obj.delete("cooky")
if (obj.search(text))
print("Exist :" + text + "\n")
else
print("Not Exist :" + text + "\n")
end
end
main()
Output
Exist :cooky
Delete Text cooky
Not Exist :cooky
/*
Node JS program
Trie Deletion
*/
class Node {
constructor(size) {
this.end = false;
this.children = new Array(size).fill(null);
}
}
class Trie {
constructor() {
this.ALPHABETS = 26;
this.root = new Node(this.ALPHABETS);
}
search(text) {
var length = text.length;
var index = 0;
var head = this.root;
for (var level = 0; level < length; level++) {
index = text.charCodeAt(level) - 'a'.charCodeAt(0);
if (head.children[index] == null) {
return false;
}
head = head.children[index];
}
if (head != null && head.end == true) {
return true;
} else {
return false;
}
}
insert(text) {
var length = text.length;
var index = 0;
var head = this.root;
for (var level = 0; level < length; level++) {
index = text.charCodeAt(level) - 'a'.charCodeAt(0);
if (head.children[index] == null) {
head.children[index] = new Node(this.ALPHABETS);
}
head = head.children[index];
}
if (head != null) {
head.end = true;
}
}
emptyNode(root) {
for (var i = 0; i < this.ALPHABETS; i++) {
if (this.root.children[i] != null) {
return false;
}
}
return true;
}
lastNode(text) {
var length = text.length;
var index = 0;
var head = this.root;
for (var level = 0; level < length; level++) {
index = text.charCodeAt(level) - 'a'.charCodeAt(0);
if (head.children[index] == null) {
return null;
}
head = head.children[index];
}
if (head != null && head.end == true) {
return head;
} else {
return null;
}
}
deleteNode(text, root, level) {
if (this.root != null) {
if (level == text.Length) {
if (this.emptyNode(this.root)) {
return null;
}
return this.root;
}
var index = text.charCodeAt(level) - 'a'.charCodeAt(0);
this.root.children[index] = this.deleteNode(text, this.root.children[index], level + 1);
if (this.root.end == false && this.emptyNode(this.root)) {
return null;
}
}
return this.root;
}
delete(text) {
var last = this.lastNode(text);
if (last != null) {
if (this.emptyNode(last)) {
this.deleteNode(text, this.root, 0);
} else {
last.end = false;
}
console.log ("Delete Text " + text);
} else {
console.log ("Not Exist Delete Text String : " + text);
}
}
}
function main() {
var obj = new Trie();
obj.insert("cooky");
obj.insert("cool");
var text = "cooky";
if (obj.search(text)) {
console.log ("Exist : " + text);
} else {
console.log ("Not Exist : " + text);
}
obj.delete("cooky");
if (obj.search(text)) {
console.log ("Exist : " + text);
} else {
console.log ("Not Exist : " + text);
}
}
main();
Output
Exist : cooky
Delete Text cooky
Not Exist : cooky
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