{"id":9301,"date":"2025-08-13T20:37:42","date_gmt":"2025-08-13T15:07:42","guid":{"rendered":"https:\/\/namastedev.com\/blog\/?p=9301"},"modified":"2025-10-15T18:08:53","modified_gmt":"2025-10-15T12:38:53","slug":"priority-queue-code","status":"publish","type":"post","link":"https:\/\/namastedev.com\/blog\/priority-queue-code\/","title":{"rendered":"Priority Queue Code"},"content":{"rendered":"\n<!-- priority: 9 -->\n<!-- Prism.js for Code Highlighting -->\n<link\n    href=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/themes\/prism-tomorrow.min.css\"\n    rel=\"stylesheet\"\n\/>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/prism.min.js\"><\/script>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/plugins\/autoloader\/prism-autoloader.min.js\"><\/script>\n<style>\n.wp_blog_theme {\n  --primary: #E58C32;\n  --secondary: #030302;\n  --light-bg: #fef9f4;\n  --text-dark: #2d2d2d;\n  --tab-radius: 12px;\n  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);\n  --code-bg: #001f3f;\n  --code-text: #d4f1ff;\n}\n\n.wp_blog_container {\n  font-family: 'Segoe UI', sans-serif;\n  background: var(--light-bg);\n  margin: 0;\n  padding: 0;\n  color: var(--text-dark);\n}\n\n\/* Heading *\/\n.wp_blog_main-heading {\n  text-align: center;\n  font-size: 2.4rem;\n  color: var(--primary);\n  margin-top: 2.5rem;\n  font-weight: bold;\n}\n\n\/* Explanation Card *\/\n.wp_blog_explanation,\n.wp_blog_code-tabs-container {\n  max-width: 940px;\n  margin: 2rem auto;\n  padding: 2rem;\n  background: white;\n  border-radius: var(--tab-radius);\n  box-shadow: var(--shadow);\n}\n\n\/* Text and Visuals *\/\n.wp_blog_explanation h2 {\n  font-size: 1.4rem;\n  color: var(--primary);\n  margin-bottom: 0.5rem;\n}\n\n.wp_blog_explanation p,\n.wp_blog_explanation li {\n  font-size: 1.05rem;\n  line-height: 1.7;\n  margin: 0.5rem 0;\n}\n\n.wp_blog_explanation code {\n  background: #fef9f4; 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\/\/Highest Priority first\n            }\n            \/\/ dequeue: Remove the Value\n            dequeue() {\n                return this.queue.shift();  \/\/ Remove the first item (highest priority)\n            }\n\n            peek() {\n                return this.queue[0];\n            }\n\n            isEmpty() {\n                return this.queue.length === 0;\n            }\n        }\n\n        \/\/ Demo\n        const pq = new PriorityQueue();\n        pq.enqueue(\"Fever\", 1);\n        pq.enqueue(\"Accident\", 5);\n        pq.enqueue(\"Headache\", 3);\n\n        console.log(pq.dequeue());  \/\/ Accident (priority 5)\n        console.log(pq.dequeue());  \/\/ Headache (priority 3)\n        <\/pre>\n        <\/div>\n<br\/>\n        <p><strong><i>This is not an efficient way to implement a priority queue; now we will look at the heap technique to implement a priority queue.<\/i><\/strong><\/p>\n        \n        <h2>Code: Heap<\/h2>\n<div class=\"wp_blog_code-tab-content active\" data-lang=\"js\">\n        <pre>\n    class MaxPriorityQueue {\n    constructor() {\n        this.heap = [];\n    }\n\n    \/\/ Enqueue an item\n    enqueue(value, priority) {\n        this.heap.push({ value, priority });\n        this.heapifyUp();\n    }\n\n    \/\/ Move new node up\n    heapifyUp() {\n        let index = this.heap.length - 1;\n        while (index > 0) {\n            let parent = Math.floor((index - 1) \/ 2);\n            if (this.heap[index].priority <= this.heap[parent].priority) break;\n            this.swap(index, parent);\n            index = parent;\n        }\n    }\n\n    \/\/ Dequeue highest-priority item\n    dequeue() {\n        if (this.heap.length === 0) return null;\n        const max = this.heap[0];\n        const end = this.heap.pop();\n\n        if (this.heap.length > 0) {\n            this.heap[0] = end;\n            this.heapifyDown();\n        }\n        return max;\n    }\n\n    \/\/ Restore heap downwards\n    heapifyDown() {\n        let index = 0;\n        let length = this.heap.length;\n        while (true) {\n            let left = 2 * index + 1;\n            let right = 2 * index + 2;\n            let largest = index;\n\n            if (left < length &#038;&#038; this.heap[left].priority > this.heap[largest].priority) {\n                largest = left;\n            }\n\n            if (right < length &#038;&#038; this.heap[right].priority > this.heap[largest].priority) {\n                largest = right;\n            }\n\n            if (largest === index) break;\n            this.swap(index, largest);\n            index = largest;\n        }\n    }\n\n        \/\/ View front item\n        front() {\n            return this.heap.length > 0 ? this.heap[0] : null;\n        }\n\n        size() {\n            return this.heap.length;\n        }\n\n        \/\/ Is Empty?\n        isEmpty() {\n            return this.heap.length === 0;\n        }\n\n        \/\/ Swap Helper\n        swap(i, j) {\n            [this.heap[i], this.heap[j]] = [this.heap[j], this.heap[i]];\n        }\n}\n        <\/pre>\n<\/div>\n        <h2>Leetcode<\/h2>\n        <p><strong>You can read about it in the LeetCode documentation.<\/strong><\/p>\n        <p>\n                <a href=\"https:\/\/support.leetcode.com\/hc\/en-us\/articles\/360011833974-What-are-the-environments-for-the-programming-languages\" target=\"_blank\"> \n    <\/a>\n        <\/p>\n        <i>source: Leetcode<\/i>\n    <\/div>\n<\/div>\n\n<script>\ndocument.addEventListener(\"DOMContentLoaded\", () => {\n  const buttons = document.querySelectorAll(\".wp_blog_code-tab-button\");\n  const contents = document.querySelectorAll(\".wp_blog_code-tab-content\");\n\n  buttons.forEach((button) => {\n    button.addEventListener(\"click\", () => {\n      const lang = button.getAttribute(\"data-lang\");\n\n      buttons.forEach((btn) => btn.classList.remove(\"active\"));\n      contents.forEach((content) => content.classList.remove(\"active\"));\n\n      button.classList.add(\"active\");\n      document\n        .querySelector(`.wp_blog_code-tab-content[data-lang=\"${lang}\"]`)\n        .classList.add(\"active\");\n    });\n  });\n\n  const themeToggle = document.getElementById(\"blogNotesThemeToggle\");\n  const themeContainer = document.querySelector(\".wp_blog_theme\");\n\n  themeToggle.addEventListener(\"click\", () => {\n    themeContainer.classList.toggle(\"dark-mode\");\n    themeToggle.textContent =\n      themeContainer.classList.contains(\"dark-mode\") ? \"\u2600\ufe0f\" : \"\ud83c\udf19\";\n  });\n});\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>\ud83c\udf19 Priority Queue Code Sorting Code In the LeetCode environment, Javascript developers have access to a built-in priority queue feature. Code: Sorting class PriorityQueue { constructor() { this.queue = []; } \/\/ enqueue: Push the Value enqueue(value, priority) { this.queue.push({ value, priority }); this.queue.sort((a, b) => b.priority &#8211; a.priority); \/\/Highest Priority first } \/\/ dequeue:<\/p>\n","protected":false},"author":108,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[210,322,176,175,211,174,172,173],"tags":[],"class_list":{"0":"post-9301","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-algorithms","7":"category-algorithms-and-data-structures","8":"category-csharp","9":"category-cplusplus","10":"category-data-structures","11":"category-java","12":"category-javascript","13":"category-python"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/9301","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/users\/108"}],"replies":[{"embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/comments?post=9301"}],"version-history":[{"count":2,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/9301\/revisions"}],"predecessor-version":[{"id":10349,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/9301\/revisions\/10349"}],"wp:attachment":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/media?parent=9301"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/categories?post=9301"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/tags?post=9301"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}