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<!DOCTYPE html>
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<title>DataStructures.dev — Learn Data Structures Through Interactive Code</title>
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<p class="nav-label">// structures</p>
<a href="#array" class="nav-item active" data-section="array">
<span class="nav-tag">01</span> Array
<span class="nav-badge green">O(1)</span>
</a>
<a href="#linked-list" class="nav-item" data-section="linked-list">
<span class="nav-tag">02</span> Linked List
<span class="nav-badge yellow">O(n)</span>
</a>
<a href="#stack" class="nav-item" data-section="stack">
<span class="nav-tag">03</span> Stack
<span class="nav-badge green">O(1)</span>
</a>
<a href="#queue" class="nav-item" data-section="queue">
<span class="nav-tag">04</span> Queue
<span class="nav-badge green">O(1)</span>
</a>
<a href="#binary-tree" class="nav-item" data-section="binary-tree">
<span class="nav-tag">05</span> Binary Tree
<span class="nav-badge blue">O(log n)</span>
</a>
<a href="#hash-table" class="nav-item" data-section="hash-table">
<span class="nav-tag">06</span> Hash Table
<span class="nav-badge green">O(1)</span>
</a>
<p class="nav-label" style="margin-top:2rem">// reference</p>
<a href="#complexity" class="nav-item" data-section="complexity">
<span class="nav-tag">↗</span> Big-O Guide
</a>
<a href="#playground" class="nav-item" data-section="playground">
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<!-- ═══ MAIN CONTENT ═══ -->
<main class="main">
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<div class="hero-eyebrow">
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<h1 class="hero-title">
Learn Data<br>
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<p class="hero-sub">
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<a href="#array" class="btn-primary">Start Learning →</a>
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<span class="t-dot red"></span>
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<span class="t-title">datastructures.dev ~ terminal</span>
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<div class="t-line"><span class="t-prompt">$</span> <span class="t-cmd">learn --structure array</span></div>
<div class="t-line t-out">✓ Loading Array implementation...</div>
<div class="t-line t-out">✓ Time: O(1) access | O(n) search</div>
<div class="t-line t-out">✓ Space: O(n)</div>
<div class="t-line"><span class="t-prompt">$</span> <span class="t-cmd">visualize --ops push pop search</span></div>
<div class="t-line t-out">✓ Interactive visualizer ready</div>
<div class="t-line"><span class="t-prompt">$</span> <span class="t-cursor">▋</span></div>
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<!-- Stats row -->
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<span class="stat-num">6</span>
<span class="stat-label">Data Structures</span>
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<div class="stat-divider"></div>
<div class="stat">
<span class="stat-num">30+</span>
<span class="stat-label">Code Examples</span>
</div>
<div class="stat-divider"></div>
<div class="stat">
<span class="stat-num">∞</span>
<span class="stat-label">Things to Learn</span>
</div>
</div>
</section>
<!-- ═══ DS SECTIONS — generated by JS ═══ -->
<section id="structures" class="structures-wrapper">
<!-- Search + Filter bar -->
<div class="filter-bar">
<div class="search-wrap">
<svg class="search-icon" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><circle cx="11" cy="11" r="8"/><path d="m21 21-4.35-4.35"/></svg>
<input type="text" id="searchInput" class="search-input" placeholder="Search structures...">
</div>
<div class="filter-chips" id="filterChips">
<button class="chip active" data-filter="">All</button>
<button class="chip" data-filter="O(1)">O(1)</button>
<button class="chip" data-filter="O(log n)">O(log n)</button>
<button class="chip" data-filter="O(n)">O(n)</button>
<button class="chip" data-filter="O(n²)">O(n²)</button>
</div>
</div>
<!-- DS Cards Grid -->
<div class="ds-grid" id="dsGrid"></div>
</section>
<!-- ═══ BIG-O REFERENCE ═══ -->
<section id="complexity" class="reference-section">
<div class="section-label">// reference guide</div>
<h2 class="section-title">Big-O Complexity</h2>
<div class="complexity-chart">
<div class="chart-header">
<span>Operation Complexity</span>
<span class="chart-subtitle">Lower is better</span>
</div>
<div class="complexity-bars">
<div class="c-bar-row">
<span class="c-name">O(1)</span>
<div class="c-bar-track"><div class="c-bar green" style="width:5%"></div></div>
<span class="c-label">Constant</span>
</div>
<div class="c-bar-row">
<span class="c-name">O(log n)</span>
<div class="c-bar-track"><div class="c-bar teal" style="width:18%"></div></div>
<span class="c-label">Logarithmic</span>
</div>
<div class="c-bar-row">
<span class="c-name">O(n)</span>
<div class="c-bar-track"><div class="c-bar yellow" style="width:38%"></div></div>
<span class="c-label">Linear</span>
</div>
<div class="c-bar-row">
<span class="c-name">O(n log n)</span>
<div class="c-bar-track"><div class="c-bar orange" style="width:58%"></div></div>
<span class="c-label">Linearithmic</span>
</div>
<div class="c-bar-row">
<span class="c-name">O(n²)</span>
<div class="c-bar-track"><div class="c-bar red" style="width:85%"></div></div>
<span class="c-label">Quadratic</span>
</div>
<div class="c-bar-row">
<span class="c-name">O(2ⁿ)</span>
<div class="c-bar-track"><div class="c-bar darkred" style="width:100%"></div></div>
<span class="c-label">Exponential</span>
</div>
</div>
</div>
<!-- DS Comparison Table -->
<div class="table-wrap">
<div class="table-label">// operation complexity comparison</div>
<table class="ds-table">
<thead>
<tr>
<th>Structure</th>
<th>Access</th>
<th>Search</th>
<th>Insert</th>
<th>Delete</th>
<th>Space</th>
</tr>
</thead>
<tbody>
<tr>
<td class="ds-name">Array</td>
<td><span class="badge green">O(1)</span></td>
<td><span class="badge yellow">O(n)</span></td>
<td><span class="badge yellow">O(n)</span></td>
<td><span class="badge yellow">O(n)</span></td>
<td><span class="badge yellow">O(n)</span></td>
</tr>
<tr>
<td class="ds-name">Linked List</td>
<td><span class="badge yellow">O(n)</span></td>
<td><span class="badge yellow">O(n)</span></td>
<td><span class="badge green">O(1)</span></td>
<td><span class="badge green">O(1)</span></td>
<td><span class="badge yellow">O(n)</span></td>
</tr>
<tr>
<td class="ds-name">Stack</td>
<td><span class="badge yellow">O(n)</span></td>
<td><span class="badge yellow">O(n)</span></td>
<td><span class="badge green">O(1)</span></td>
<td><span class="badge green">O(1)</span></td>
<td><span class="badge yellow">O(n)</span></td>
</tr>
<tr>
<td class="ds-name">Queue</td>
<td><span class="badge yellow">O(n)</span></td>
<td><span class="badge yellow">O(n)</span></td>
<td><span class="badge green">O(1)</span></td>
<td><span class="badge green">O(1)</span></td>
<td><span class="badge yellow">O(n)</span></td>
</tr>
<tr>
<td class="ds-name">BST (avg)</td>
<td><span class="badge teal">O(log n)</span></td>
<td><span class="badge teal">O(log n)</span></td>
<td><span class="badge teal">O(log n)</span></td>
<td><span class="badge teal">O(log n)</span></td>
<td><span class="badge yellow">O(n)</span></td>
</tr>
<tr>
<td class="ds-name">Hash Table</td>
<td><span class="badge gray">N/A</span></td>
<td><span class="badge green">O(1)</span></td>
<td><span class="badge green">O(1)</span></td>
<td><span class="badge green">O(1)</span></td>
<td><span class="badge yellow">O(n)</span></td>
</tr>
</tbody>
</table>
</div>
</section>
<!-- ═══ PLAYGROUND ═══ -->
<section id="playground" class="playground-section">
<div class="section-label">// code playground</div>
<h2 class="section-title">Try It Live</h2>
<div class="playground-wrap">
<div class="playground-toolbar">
<select id="playgroundTemplate" class="pg-select">
<option value="">Select a template...</option>
<option value="array">Array Operations</option>
<option value="stack">Stack (Push/Pop)</option>
<option value="queue">Queue (Enqueue/Dequeue)</option>
<option value="linkedlist">Linked List</option>
<option value="bst">Binary Search Tree</option>
<option value="hashtable">Hash Table</option>
</select>
<div class="pg-actions">
<button class="pg-btn" id="clearBtn">Clear</button>
<button class="pg-btn primary" id="runBtn">▶ Run</button>
</div>
</div>
<div class="playground-editor">
<div class="editor-gutter" id="editorGutter"></div>
<textarea id="playgroundCode" class="pg-editor" spellcheck="false" placeholder="// Select a template or write your own JavaScript
// Your output will appear in the console below
const arr = [1, 2, 3, 4, 5];
console.log('Array:', arr);
console.log('Length:', arr.length);
console.log('First:', arr[0]);"></textarea>
</div>
<div class="playground-console" id="playgroundConsole">
<div class="console-header">
<span>// console output</span>
<button class="console-clear" id="consoleClearBtn">clear</button>
</div>
<div class="console-output" id="consoleOutput">
<p class="console-hint">Click ▶ Run to execute your code</p>
</div>
</div>
</div>
</section>
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