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linkedlist.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta content="width=device-width, initial-scale=1.0" name="viewport" />
<title>Linked list - AlgoVis.io</title>
<meta
content="AlgoVis is an online algorithm visualization tool."
name="description"
/>
<meta content="algorithm visualization tool online" name="keywords" />
<!-- Favicons -->
<link href="assets/img/favicon.png" rel="icon" />
<link href="assets/img/apple-touch-icon.png" rel="apple-touch-icon" />
<!-- Google Fonts -->
<link
href="https://fonts.googleapis.com/css?family=Open+Sans:300,300i,400,400i,600,600i,700,700i|Raleway:300,300i,400,400i,500,500i,600,600i,700,700i|Poppins:300,300i,400,400i,500,500i,600,600i,700,700i"
rel="stylesheet"
/>
<!-- Vendor CSS Files -->
<link
href="assets/vendor/bootstrap/css/bootstrap.min.css"
rel="stylesheet"
/>
<link href="assets/vendor/icofont/icofont.min.css" rel="stylesheet" />
<link href="assets/vendor/boxicons/css/boxicons.min.css" rel="stylesheet" />
<link href="assets/vendor/venobox/venobox.css" rel="stylesheet" />
<link
href="assets/vendor/owl.carousel/assets/owl.carousel.min.css"
rel="stylesheet"
/>
<link href="assets/vendor/aos/aos.css" rel="stylesheet" />
<link rel="stylesheet" href="assets/css/main.css" />
<link
rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-slider/11.0.2/css/bootstrap-slider.min.css"
/>
<!-- Template Main CSS File -->
<link href="assets/css/style.css" rel="stylesheet" />
</head>
<body>
<!-- ======= Top Bar ======= -->
<div
id="topbar"
class="d-none d-lg-flex align-items-center fixed-top header-inner-pages"
>
<div class="container-fluid d-flex">
<div class="contact-info mr-auto"></div>
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<a href="https://twitter.com/tobiasnoethlich" class="twitter"
><i class="icofont-twitter"></i
></a>
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><i class="icofont-github"></i
></a>
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href="https://www.xing.com/profile/Tobias_Noethlich/cv"
class="xing"
><i class="icofont-xing"></i
></a>
<a
href="https://www.linkedin.com/in/tobias-noethlich/"
class="linkedin"
><i class="icofont-linkedin"></i
></a>
</div>
</div>
</div>
<!-- ======= Header ======= -->
<header id="header" class="fixed-top header-inner-pages">
<div class="container-fluid d-flex align-items-center">
<a class="btn back-button mr-4" href="datastructures.html"
><i class="bx bx-arrow-back white-text" aria-hidden="true"></i>
Back</a
>
<h1 class="logo mr-auto"><a href="index.html">Algovis.io</a></h1>
<!-- Uncomment below if you prefer to use an image logo -->
<!-- <a href="index.html" class="logo mr-auto"><img src="assets/img/logo.png" alt="" class="img-fluid"></a>-->
<nav class="nav-menu d-none d-lg-block">
<ul>
<li><a href="index.html">Home</a></li>
</ul>
</nav>
<!-- .nav-menu -->
</div>
</header>
<!-- End Header -->
<main id="main">
<!-- ======= Breadcrumbs ======= -->
<section id="breadcrumbs" class="breadcrumbs">
<div class="container-fluid">
<ol>
<li><a href="index.html">Home</a></li>
<li><a href="datastructures.html">Data structures</a></li>
<li>Linked list</li>
</ol>
<h2>Linked list visualization</h2>
</div>
</section>
<!-- End Breadcrumbs -->
<section class="inner-page pt-2">
<div class="container-fluid">
<div class="row mx-auto mb-2">
<div class="col-sm-2 pl-0">
<button
class="btn btn-block btn-dark"
onclick="generateLinkedList()"
id="generate"
>
Generate random list
</button>
</div>
<div class="col-sm-2 pl-0">
<div class="dropdown">
<button
class="btn btn-dark btn-block dropdown-toggle"
type="button"
id="dropdownOp"
data-toggle="dropdown"
aria-haspopup="true"
aria-expanded="false"
>
Select an operation
</button>
<div class="dropdown-menu" aria-labelledby="dropdownOp">
<button
class="dropdown-item"
onclick="setOperation(1)"
type="button"
>
Insert element
</button>
<button
class="dropdown-item"
onclick="setOperation(2)"
type="button"
>
Remove element
</button>
<button
class="dropdown-item"
onclick="setOperation(3)"
type="button"
>
Search element
</button>
</div>
</div>
</div>
<div id="posInput" class="col-sm-3 pl-0" hidden>
<form class="form-inline">
<div class="col-5">
<label class="mr-2" for="data-pos-input" id="pos-label"
>Position (0..N)</label
>
</div>
<div class="col-7">
<input
type="number"
class="form-control mx-auto w-100"
id="data-pos-input"
placeholder="0"
/><small id="pos-error" class="red-text" hidden
>Please select an index from X to Y.</small
>
</div>
</form>
</div>
<div id="valInput" class="col-sm-3 pl-0" hidden>
<form class="form-inline">
<div class="col-2">
<label class="mr-2" for="data-val-input">Data:</label>
</div>
<div class="col-10">
<input
type="number"
class="form-control mx-auto w-100"
id="data-val-input"
placeholder="22"
/><small id="data-error" class="red-text" hidden>
Please select a number < 100.
</small>
</div>
</form>
</div>
<div class="col-sm-2 pl-0">
<button
class="btn btn-block btn-danger red"
type="button"
id="startOp"
onclick="runOp()"
>
Go!
</button>
</div>
</div>
<div class="data-container border-dark p-1 mb-0 mt-0 w-100">
<svg id="visu"></svg>
</div>
<div class="row mx-auto" id="remove-pseudocode" hidden>
<div class="col-sm-12 col-md-12 col-lg-6 px-0 mr-0">
<div class="ide w-100">
<div class="row ml-auto mr-auto 1">
<span class="op">switch</span>(position)
</div>
<div class="row ml-auto mr-auto mt-1 2">
  <span class="op">case</span> 0:
</div>
<div class="row ml-auto mr-auto mt-1 3">
     head = head.<span class="var"
>next</span
>
</div>
<div class="row ml-auto mr-auto mt-1 4">
  <span class="op">case</span> list.length - 1:
</div>
<div class="row ml-auto mr-auto mt-1 5">
     current = head
</div>
<div class="row ml-auto mr-auto mt-1 6">
     index = 0
</div>
<div class="row ml-auto mr-auto mt-1 7">
     
<span class="op">while</span>(current.
<span class="var">next</span>
!= tail)
</div>
<div class="row ml-auto mr-auto mt-1 8">
       current = current.
<span class="var">next</span>
</div>
<div class="row ml-auto mr-auto mt-1 9">
       index += 1
</div>
<div class="row ml-auto mr-auto mt-1 10">
     current.<span class="var">next</span>
= none
</div>
<div class="row ml-auto mr-auto mt-1 11">
     tail = current
</div>
<div class="row ml-auto mr-auto mt-1 12">
   <span class="op">default</span>:
</div>
<div class="row ml-auto mr-auto mt-1 13">
     current = head
</div>
<div class="row ml-auto mr-auto mt-1 14">
     index = 0
</div>
<div class="row ml-auto mr-auto mt-1 15">
     
<span class="op">while</span>(index + 1 != position)
</div>
<div class="row ml-auto mr-auto mt-1 16">
       current = current.
<span class="var">next</span>
</div>
<div class="row ml-auto mr-auto mt-1 17">
       index += 1
</div>
<div class="row ml-auto mr-auto mt-1 18">
     nextNext = current.<span class="var"
>next</span
>.<span class="var">next</span>
</div>
<div class="row ml-auto mr-auto mt-1 19">
     current.
<span class="var">next</span> = nextNext
</div>
</div>
</div>
<div class="col-sm-12 col-md-12 col-lg-6 ml-0 px-0">
<div class="ide w-100 pl-0">
<div class="row ml-auto mr-auto">
<span class="comment w-100"> </span>
<span class="comment w-100 mt-1"> </span>
<span class="comment w-100 mt-1"> </span>
<span class="comment w-100 mt-1">---------------------</span>
<span class="comment w-100 mt-1">| SHORT EXPLANATION |</span>
<span class="comment w-100 mt-1">---------------------</span>
<span class="comment w-100 mt-1"
>1. Determine which node will be removed</span
>
<span class="comment w-100 mt-1">
- if it's the head, just update the head pointer
</span>
<span class="comment w-100 mt-1"
>- if it's the tail, traverse the list and set the sucessor
of the node before the tail to none</span
>
<span class="comment w-100 mt-1"
>2. If it gets removed from index N, traverse the list up to
node N-1 and get the node after the node it points to
</span>
<span class="comment w-100 mt-1"
>3. Point the 'next' pointer of the node at N-1 to the node
obtained in step 2</span
>
<span class="comment w-100 mt-1"> </span>
<span class="comment w-100 mt-1"> </span>
<span class="comment w-100 mt-1">Time complexity:</span>
<span class="comment w-100 mt-1">Remove head: O(1)</span>
<span class="comment w-100 mt-1">Remove tail: O(n)</span>
<span class="comment w-100 mt-1"
>Remove from index: O(n)</span
>
<span class="comment w-100 mt-1"> </span>
<span class="comment w-100 mt-1"> </span>
</div>
</div>
</div>
</div>
<div class="row mx-auto" id="insert-pseudocode" hidden>
<div class="col-sm-12 col-md-12 col-lg-6 px-0 mr-0">
<div class="ide w-100">
<div class="row ml-auto mr-auto 1">
<span class="op">switch</span>(position)
</div>
<div class="row ml-auto mr-auto mt-1 2">
  <span class="op">case</span> 0:
</div>
<div class="row ml-auto mr-auto mt-1 3">
     node.<span class="var">next</span> =
head
</div>
<div class="row ml-auto mr-auto mt-1 4">
     head = node
</div>
<div class="row ml-auto mr-auto mt-1 5">
  <span class="op">case</span> list.length:
</div>
<div class="row ml-auto mr-auto mt-1 6">
     tail.<span class="var">next</span> =
node
</div>
<div class="row ml-auto mr-auto mt-1 7">
     tail = node
</div>
<div class="row ml-auto mr-auto mt-1 8">
  <span class="op">default</span>:
</div>
<div class="row ml-auto mr-auto mt-1 9">
     current = head
</div>
<div class="row ml-auto mr-auto mt-1 10">
     <span class="op">for</span>(i = 0 to
position - 1)
</div>
<div class="row ml-auto mr-auto mt-1 11">
       current = current.
<span class="var">next</span>
</div>
<div class="row ml-auto mr-auto mt-1 12">
     node.<span class="var">next</span> =
current.<span class="var">next</span>
</div>
<div class="row ml-auto mr-auto mt-1 13">
     current.<span class="var">next</span>
= node
</div>
</div>
</div>
<div class="col-sm-12 col-md-12 col-lg-6 ml-0 px-0">
<div class="ide w-100 pl-0">
<div class="row ml-auto mr-auto">
<span class="comment w-100">SHORT EXPLANATION</span>
<span class="comment w-100 mt-1">-----------------</span>
<span class="comment w-100 mt-1"
>1. Determine where the new node will be inserted</span
>
<span class="comment w-100 mt-1">
- if it becomes the new head, overwrite the current head
after saving it as the node's successor
</span>
<span class="comment w-100 mt-1"
>- if it's the new tail, set it as the successor of the
current tail</span
>
<span class="comment w-100 mt-1"
>2. If it gets inserted at index N, traverse the list up to
node N-1 and get the node it points to
</span>
<span class="comment w-100 mt-1"
>3. Point the 'next' pointer of the new node to the node
obtained in step 2</span
>
<span class="comment w-100 mt-1"
>4. Point the 'next' pointer of the node at index N-1 to the
new node</span
>
<span class="comment w-100 mt-1"> </span>
<span class="comment w-100 mt-1">Time complexity:</span>
<span class="comment w-100 mt-1">Insert as head: O(1)</span>
<span class="comment w-100 mt-1"
>Insert as tail: O(1) if you keep pointer to the tail, O(n)
else</span
>
<span class="comment w-100 mt-1">Insert at index: O(n)</span>
</div>
</div>
</div>
</div>
<div class="row mx-auto" id="search-pseudocode" hidden>
<div class="col-sm-12 col-md-12 col-lg-6 px-0 mr-0">
<div class="ide w-100">
<div class="row ml-auto mr-auto 1">current = head</div>
<div class="row ml-auto mr-auto mt-1 2">index = 0</div>
<div class="row ml-auto mr-auto mt-1 3">
<span class="op">while</span>(current.data != data)
</div>
<div class="row ml-auto mr-auto mt-1 4">
   <span class="op">if</span>(current.
<span class="var">next</span> == none)
</div>
<div class="row ml-auto mr-auto mt-1 5">
    
<span class="op">return</span> -1
</div>
<div class="row ml-auto mr-auto mt-1 6">
  current = current.<span class="var">next</span>
</div>
<div class="row ml-auto mr-auto mt-1 7">
  index += 1
</div>
<div class="row ml-auto mr-auto mt-1 8">
<span class="op">return</span> index
</div>
</div>
</div>
<div class="col-sm-12 col-md-12 col-lg-6 ml-0 px-0">
<div class="ide w-100 pl-0">
<div class="row ml-auto mr-auto">
<span class="comment w-100">SHORT EXPLANATION</span>
<span class="comment w-100 mt-1">-----------------</span>
<span class="comment w-100 mt-1"
>1. Traverse the list until element is found or the whole
list has been traversed</span
>
<span class="comment w-100 mt-1">
- if element was found, return index
</span>
<span class="comment w-100 mt-1"
>- else return not_found</span
>
<span class="comment w-100 mt-1">  </span>
<span class="comment w-100 mt-1">Time complexity</span>
<span class="comment w-100 mt-1">Find element: O(n)</span>
</div>
</div>
</div>
</div>
</div>
</section>
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<script>
const container = document.querySelector(".data-container");
var DELAY = 500;
var w = globalThis.screen.availWidth;
var h = 370;
var data_nodes = [];
var data_set = new Set();
var radius = 25;
var strokeWidth = "5px";
var list = new LinkedList();
function setDelay(delay) {
DELAY = delay;
}
var xScale = d3.scaleLinear().domain([0, w]).range([0, w]);
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async function generateLinkedList() {
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data_set = new Set();
data_nodes = [];
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];
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let data = Math.round(Math.random() * 98 + 1);
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data = Math.round(Math.random() * 98 + 1);
}
data_set.add(data);
await list.insert(data, i);
}
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await highlightCode(0);
}
function setOperation(op) {
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case 1:
operation = "insert";
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$("#remove-pseudocode, #search-pseudocode").prop("hidden", true);
$("#pos-label").html("Position (0..N)");
break;
case 2:
operation = "remove";
$("#dropdownOp").html("Remove element");
$("#posInput, #remove-pseudocode").prop("hidden", false);
$("#valInput, #insert-pseudocode, #search-pseudocode").prop(
"hidden",
true
);
$("#pos-label").html("Position (0..N-1)");
break;
case 3:
operation = "search";
$("#dropdownOp").html("Search element");
$("#posInput, #insert-pseudocode, #remove-pseudocode").prop(
"hidden",
true
);
$("#valInput, #search-pseudocode").prop("hidden", false);
break;
default:
operation = "insert";
$("#dropdownOp").html("Insert element");
$("#posInput, #valInput, #insert-pseudocode").prop("hidden", false);
$("#remove-pseudocode, #search-pseudocode").prop("hidden", true);
break;
}
}
async function runOp() {
$("#generate, #dropdownOp, #startOp").prop("disabled", true);
switch (operation) {
//--- INSERT ---
case "insert":
d3.select("#results-text").text("");
let pos = !$("#data-pos-input").val()
? 0
: Number($("#data-pos-input").val());
let error = false;
if (pos > list.length) {
$("#data-pos-input").css("border-color", "red");
$("#pos-error").prop("hidden", false);
let text =
list.length == 0
? "Please generate a linked list first, or add a node to position 0."
: "Please select an index from 0 to " + list.length + ".";
$("#pos-error").html(text);
error = true;
} else if (pos < 0) {
$("#data-pos-input").css("border-color", "red");
$("#pos-error").prop("hidden", false);
let text = "Indices can't be negative.";
$("#pos-error").html(text);
error = true;
} else {
$("#data-pos-input").css("border-color", "");
$("#pos-error").prop("hidden", true);
}
let data = !$("#data-val-input").val()
? 22
: Number($("#data-val-input").val());
if (data > 99) {
$("#data-val-input").css("border-color", "red");
$("#data-error").prop("hidden", false);
$("#data-error").html("Please select a number < 100.");
error = true;
} else if (data_set.has(data)) {
$("#data-val-input").css("border-color", "red");
$("#data-error").prop("hidden", false);
$("#data-error").html(
"Please select a number that's not already in the list."
);
error = true;
} else if (data < -9) {
$("#data-val-input").css("border-color", "red");
$("#data-error").prop("hidden", false);
$("#data-error").html("Please select a number > -10.");
error = true;
} else if (list.length == 10) {
$("#data-val-input").css("border-color", "red");
$("#data-error").prop("hidden", false);
$("#data-error").html("The maximum size of the list is 10.");
error = true;
} else {
$("#data-val-input").css("border-color", "");
$("#data-error").prop("hidden", true);
}
if (!error) {
data_set.add(data);
await list.insert(data, pos);
await highlightCode(0);
}
break;
//--- REMOVE ---
case "remove":
d3.select("#results-text").text("");
let index = !$("#data-pos-input").val()
? 0
: Number($("#data-pos-input").val());
if (index > list.length - 1) {
$("#data-pos-input").css("border-color", "red");
$("#pos-error").prop("hidden", false);
let text =
list.length == 0
? "Please generate a linked list first, or add a node to position 0."
: "Please select an index from 0 to " +
(list.length - 1) +
".";
$("#pos-error").html(text);
} else if (index < 0) {
$("#data-pos-input").css("border-color", "red");
$("#pos-error").prop("hidden", false);
let text = "Indices can't be negative.";
$("#pos-error").html(text);
} else {
$("#data-pos-input").css("border-color", "");
$("#pos-error").prop("hidden", true);
await list.remove(index);
await highlightCode(0);
}
break;
//--- SEARCH ---
case "search":
d3.select("#results-text").text("");
let find = !$("#data-val-input").val()
? 22
: Number($("#data-val-input").val());
if (find > 99) {
$("#data-val-input").css("border-color", "red");
$("#data-error").prop("hidden", false);
$("#data-error").html("Please select a number < 100.");
} else {
$("#data-val-input").css("border-color", "");
$("#data-error").prop("hidden", true);
let index = await list.search(find);
await highlightCode(0);
if (index >= 0) {
d3.select("#results-text").text(
"Found element " + find + " at index " + index + "."
);
} else {
d3.select("#results-text").text(
"Did not find element " + find + " in list."
);
}
}
break;
default:
break;
}
$("#generate, #dropdownOp, #startOp").prop("disabled", false);
}
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