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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<script src="https://cdn.tailwindcss.com"></script>
<title>Find Middle of the Linked List</title>
</head>
<body>
<nav
class="flex items-center justify-between z-50 flex-wrap bg-white px-5 pt-1 pb-1 lg:px-20 sticky top-0 text-center border-b border-gray-200 shadow-sm">
<div class="flex items-center flex-shrink-0 text-slate-800 mr-6 p-2">
<a href="">
<img src="logo.png" class="mr-2 h-8 w-8" alt="Logo" />
</a>
<a href="/" class="font-bold text-xl">Find Middle of the Linked List</a>
</div>
<div class="lg:hidden">
<div class="flex items-center px-3 py-2 border rounded text-slate-800 border-gray-200 hover:text-slate-500 hover:border-gray-500"
onclick="toggleMenu()">
<svg class="fill-current h-3 w-3" viewBox="0 0 20 20" xmlns="http://www.w3.org/2000/svg">
<path d="M0 3h20v2H0V3zm0 6h20v2H0V9zm0 6h20v2H0v-2z" />
</svg>
</div>
</div>
<div id="menu" class="w-full hidden text-left lg:flex lg:items-center lg:w-auto">
<div class="text-md">
<a href="/"
class="block mt-4 lg:inline-block lg:mt-0 text-slate-800 hover:text-slate-500 font-semibold mr-4">
Home
</a>
<a href="#"
class="block mt-4 lg:inline-block lg:mt-0 text-slate-800 hover:text-slate-500 font-semibold mr-4">
About
</a>
<a href="#"
class="block mt-4 lg:inline-block lg:mt-0 text-slate-800 hover:text-slate-500 font-semibold mr-4">
Contact
</a>
</div>
</div>
<div id="github" class="hidden lg:flex">
<a href="https://github.com/sauravhathi/find-middle-of-the-linked-list"
class="inline-block font-bold px-4 py-2 leading-none border rounded text-blue-600 border-blue-600 hover:border-transparent hover:text-white hover:bg-blue-600 mt-4 lg:mt-0">
Github
</a>
</div>
</nav>
<hero class="grid px-5 lg:px-14 grid-cols-1 lg:grid-cols-2 items-center justify-items-center h-screen">
<div class="flex flex-col items-center lg:items-start gap-20">
<div class="w-10/12">
<h1 class="text-4xl font-bold text-slate-800">Find Middle of the Linked List</h1>
<p class="text-xl text-slate-800 mt-4">
THis website will help you to find the middle of the linked list.
</p>
</div>
<div>
<a href="#find">
<button
class="bg-blue-500 hover:bg-blue-600 text-white px-14 py-4 rounded-md text-xl hover:animate-bounce font-semibold">
Get Started
</button>
</a>
</div>
</div>
<div class="hidden lg:block">
<img src="hero.png" class="rounded-xl w-11/12 border-2 border-blue-600 border-opacity-50 shadow-xl"
alt="Hero" />
</div>
</hero>
<div class="container mx-auto">
<div class="flex justify-center items-center h-screen">
<div class="xl:w-1/3 lg:w-1/2 md:w-2/3 w-3/4">
<div id="find" class="mb-10">
<h1 class="text-2xl font-bold text-center">
Find Middle of the Linked List
</h1>
</div>
<div class="bg-white shadow-md rounded px-8 pt-6 pb-8 mb-4">
<div class="mb-4">
<label class="block text-gray-700 text-sm font-bold mb-2" for="list">
Enter the Linked List
</label>
<input
class="shadow appearance-none border rounded w-full py-2 px-3 text-gray-700 leading-tight focus:outline-none focus:shadow-outline"
id="list" name="list" type="text" placeholder="e.g. 124 567 834 123 534"
onchange="reset()" />
<p class="text-red-500 text-xs italic" id="list-error"></p>
</div>
<div class="flex items-center justify-end">
<button
class="bg-blue-500 hover:bg-blue-600 text-white font-bold py-2 px-4 rounded focus:outline-none focus:shadow-outline"
type="submit" id="submit" onclick="findMiddle()">
Submit
</button>
</div>
<div class="mt-4 text-left hidden" id="result-div">
<h1 class="text-xl font-bold">Result</h1>
<div class="mt-4">
<p id="result"></p>
</div>
</div>
</div>
</div>
</div>
</div>
<footer class="text-center text-sm p-4 bottom-0 border-t border-gray-200 w-full">
Made with ❤️ by
<a href="https://github.com/sauravhathi/">Saurav Hathi</a>
</footer>
<script>
// responsive menu bar
function toggleMenu() {
var menu = document.getElementById("menu");
var github = document.getElementById("github");
if (
menu.classList.contains("hidden") &&
github.classList.contains("hidden")
) {
menu.classList.remove("hidden");
github.classList.remove("hidden");
} else {
menu.classList.add("hidden");
github.classList.add("hidden");
}
}
// get value from input
function getList() {
var list = document.getElementById("list").value;
// remove beginning and ending spaces and split the string
list = list.trim().split(" ");
// if list is empty
list = list.filter((item) => item !== "");
// return the list
return list;
}
// validate input
function validateArray(list) {
if (list.length == 0) {
return false;
}
for (var i = 0; i < list.length; i++) {
if (isNaN(list[i])) {
return false;
}
}
return true;
}
function reset() {
var list = getList();
var listError = document.getElementById("list-error");
var resultDiv = document.getElementById("result-div");
var result = document.getElementById("result");
// validate input
if (!validateArray(list)) {
listError.innerHTML = "Please enter a valid list";
resultDiv.classList.add("hidden");
} else {
listError.innerHTML = "";
resultDiv.classList.add("hidden");
}
}
class Node {
constructor(data) {
this.data = data;
this.next = null;
}
}
class LinkedList {
constructor() {
this.head = null;
this.size = 0;
}
add(data) {
var node = new Node(data);
var current;
if (this.head == null) {
this.head = node;
} else {
current = this.head;
while (current.next) {
current = current.next;
}
current.next = node;
}
this.size++;
}
// find middle of the linked list
findMiddle() {
var fast = this.head;
var slow = this.head;
while (fast !== null && fast.next !== null) {
fast = fast.next.next;
slow = slow.next;
}
return slow.data;
}
}
function findMiddle() {
var list = getList();
var listError = document.getElementById("list-error");
var resultDiv = document.getElementById("result-div");
var result = document.getElementById("result");
// validate input
if (!validateArray(list)) {
listError.innerHTML = "Please enter a valid list";
resultDiv.classList.add("hidden");
} else {
listError.innerHTML = "";
// create linked list
var linkedList = new LinkedList();
// add elements to the linked list
for (var i = 0; i < list.length; i++) {
linkedList.add(list[i]);
}
// find middle of the linked list
var middle = linkedList.findMiddle();
var ul = document.createElement("ul");
var indexOfListUl = document.createElement("ul");
ul.classList.add("flex", "flex-row", "justify-center", "items-center", "gap-4", "mt-4");
indexOfListUl.classList.add("flex", "flex-row", "justify-center", "items-center", "gap-4", "mt-4");
var temp_index;
// print the linked list and show the middle element in red color
for (var i = 0; i < list.length; i++) {
var li = document.createElement("li");
var indexOfListLi = document.createElement("li");
li.innerHTML = list[i];
indexOfListLi.innerHTML = i;
// if the element is middle element then change the color to red
if (list[i] == middle) {
li.classList.add("bg-rose-600", "text-white", "rounded-md", "w-10", "h-10", "flex", "justify-center", "items-center");
indexOfListLi.classList.add("font-bold", "text-rose-600", "w-10", "h-10", "flex", "justify-center", "items-center");
temp_index = i;
}
else {
li.classList.add("bg-slate-900", "text-white", "rounded-md", "w-10", "h-10", "flex", "justify-center", "items-center");
indexOfListLi.classList.add("w-10", "h-10", "flex", "justify-center", "items-center");
}
// append the elements to the ul tag
ul.appendChild(li);
// append the index of the elements to the ul tag
indexOfListUl.appendChild(indexOfListLi);
}
result.innerHTML = "";
result.appendChild(ul);
result.appendChild(indexOfListUl);
// print the middle element
var p = document.createElement("p");
p.classList.add("mt-4");
p.innerHTML = "The middle of the list is <span class=\"font-bold text-rose-600\">" + middle + "</span> at index <span class=\"font-bold text-rose-600\">" + temp_index + "</span>";
result.appendChild(p);
// remove hidden class from result div
resultDiv.classList.remove("hidden");
}
}
</script>
</body>
</html>