{"id":191,"date":"2025-05-28T11:58:06","date_gmt":"2025-05-28T06:28:06","guid":{"rendered":"https:\/\/codeanddebug.in\/blog\/?p=191"},"modified":"2026-04-04T14:42:43","modified_gmt":"2026-04-04T09:12:43","slug":"palindrome-number-program-in-python","status":"publish","type":"post","link":"https:\/\/codeanddebug.in\/blog\/palindrome-number-program-in-python\/","title":{"rendered":"Palindrome Number Program in Python | Leetcode #9"},"content":{"rendered":"\n<p>Hello everyone! In this article, we&#8217;ll guide you through a thorough explanation of Leetcode #9. Explaining the palindrome number program in Python. The <strong>[<a href=\"https:\/\/leetcode.com\/problems\/palindrome-number\/description\/\" target=\"_blank\" rel=\"noreferrer noopener\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-purple-color\"><span style=\"text-decoration: underline;\">Problem Link<\/span><\/mark><\/a>]<\/strong> is given here for your quick reference.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"0-examples-of-palindrome-number-program-in-python\">Examples of Palindrome Number Program in Python:<\/h2>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>Example 1:\n\n  Input: x = 121\n  Output: true\n  Explanation: 121 reads as 121 from left to right and from right to left.\n\nExample 2:\n\n  Input: x = -121\n  Output: false\n  Explanation: From left to right, it reads -121. From right to left, it becomes 121-. Therefore it is not a palindrome.\n\nExample 3:\n\n  Input: x = 10\n  Output: false\n  Explanation: Reads 01 from right to left. Therefore it is not a palindrome.<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #D4D4D4\">Example <\/span><span style=\"color: #B5CEA8\">1<\/span><span style=\"color: #D4D4D4\">:<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  Input: x = <\/span><span style=\"color: #B5CEA8\">121<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  Output: true<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  Explanation: <\/span><span style=\"color: #B5CEA8\">121<\/span><span style=\"color: #D4D4D4\"> reads <\/span><span style=\"color: #C586C0\">as<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #B5CEA8\">121<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #C586C0\">from<\/span><span style=\"color: #D4D4D4\"> left to right <\/span><span style=\"color: #569CD6\">and<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #C586C0\">from<\/span><span style=\"color: #D4D4D4\"> right to left.<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">Example <\/span><span style=\"color: #B5CEA8\">2<\/span><span style=\"color: #D4D4D4\">:<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  Input: x = -<\/span><span style=\"color: #B5CEA8\">121<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  Output: false<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  Explanation: From left to right, it reads -<\/span><span style=\"color: #B5CEA8\">121<\/span><span style=\"color: #D4D4D4\">. From right to left, it becomes <\/span><span style=\"color: #B5CEA8\">121<\/span><span style=\"color: #D4D4D4\">-. Therefore it <\/span><span style=\"color: #569CD6\">is<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">not<\/span><span style=\"color: #D4D4D4\"> a palindrome.<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">Example <\/span><span style=\"color: #B5CEA8\">3<\/span><span style=\"color: #D4D4D4\">:<\/span><\/span>\n<span class=\"line\"><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  Input: x = <\/span><span style=\"color: #B5CEA8\">10<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  Output: false<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">  Explanation: Reads <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #F44747\">1<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #C586C0\">from<\/span><span style=\"color: #D4D4D4\"> right to left. Therefore it <\/span><span style=\"color: #569CD6\">is<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">not<\/span><span style=\"color: #D4D4D4\"> a palindrome.<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Understand by watching video<\/h2>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-4-3 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"DSA in Python Course - Check if a Number is Palindrome or Not - Part 7 [Hindi] | Code &amp; Debug\" width=\"814\" height=\"611\" src=\"https:\/\/www.youtube.com\/embed\/ecZVpAZ37UI?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"1-1optimal-solution\">1. Optimal Solution<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"2-problem-statement\">Problem Statement:<\/h3>\n\n\n\n<p><strong>Objective:<\/strong> The given code aims to determine whether a given integer &#8220;x&#8221; is a palindrome. A palindrome is a number that reads the same backward as forward.<\/p>\n\n\n\n<p><strong>Purpose:<\/strong> The function &#8220;isPalindrome&#8221; is designed to check if the integer &#8220;x&#8221; remains the same when its digits are reversed.<\/p>\n\n\n\n<p><strong>Expected Input and Output:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Input:<\/strong> An integer &#8220;x&#8221;.<\/li>\n\n\n\n<li><strong>Output:<\/strong> A boolean value True if &#8220;x&#8221; is a palindrome, and False otherwise.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"3-intuition-and-approach\">Intuition and Approach:<\/h3>\n\n\n\n<p><strong>Intuition:<\/strong> To check if a number is a palindrome, we can reverse its digits and then compare the reversed number with the original number. If they are equal, the number is a palindrome.<\/p>\n\n\n\n<p><strong>Approach:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Handle negative numbers separately, as they cannot be palindromes<\/li>\n\n\n\n<li>Convert the number to its absolute value for easier processing (although the check for negativity at the beginning makes this unnecessary in the given code)<\/li>\n\n\n\n<li>Initialize a variable to store the reversed number<\/li>\n\n\n\n<li>Use a loop to extract the last digit of the number and build the reversed number<\/li>\n\n\n\n<li>Compare the reversed number with the original number to determine if it is a palindrome<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"4-code\">Code:<\/h3>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#1E1E1E\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#D4D4D4;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>class Solution:\n    def isPalindrome(self, x: int) -> bool:\n        if x &lt; 0:\n            return False\n        num = x\n        palindrome_number = 0\n        while num > 0:\n            last_digit = num % 10\n            palindrome_number = (palindrome_number * 10) + last_digit\n            num \/\/= 10\n        return palindrome_number == x<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki dark-plus\" style=\"background-color: #1E1E1E\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #569CD6\">class<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #4EC9B0\">Solution<\/span><span style=\"color: #D4D4D4\">:<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">    <\/span><span style=\"color: #569CD6\">def<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #DCDCAA\">isPalindrome<\/span><span style=\"color: #D4D4D4\">(<\/span><span style=\"color: #9CDCFE\">self<\/span><span style=\"color: #D4D4D4\">, <\/span><span style=\"color: #9CDCFE\">x<\/span><span style=\"color: #D4D4D4\">: <\/span><span style=\"color: #4EC9B0\">int<\/span><span style=\"color: #D4D4D4\">) -&gt; <\/span><span style=\"color: #4EC9B0\">bool<\/span><span style=\"color: #D4D4D4\">:<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">if<\/span><span style=\"color: #D4D4D4\"> x &lt; <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">:<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> <\/span><span style=\"color: #569CD6\">False<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        num = x<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        palindrome_number = <\/span><span style=\"color: #B5CEA8\">0<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">while<\/span><span style=\"color: #D4D4D4\"> num &gt; <\/span><span style=\"color: #B5CEA8\">0<\/span><span style=\"color: #D4D4D4\">:<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            last_digit = num % <\/span><span style=\"color: #B5CEA8\">10<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            palindrome_number = (palindrome_number * <\/span><span style=\"color: #B5CEA8\">10<\/span><span style=\"color: #D4D4D4\">) + last_digit<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">            num \/\/= <\/span><span style=\"color: #B5CEA8\">10<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D4D4D4\">        <\/span><span style=\"color: #C586C0\">return<\/span><span style=\"color: #D4D4D4\"> palindrome_number == x<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Negative Number Check:<\/strong> The function immediately returns False if &#8220;x&#8221; is negative, as negative numbers cannot be palindromes.<\/li>\n\n\n\n<li><strong>Initialize Variables:<\/strong> The variable &#8220;num&#8221; is initialized to &#8220;x&#8221; and &#8220;palindrome_number&#8221; is initialized to 0 to build the reversed number.<\/li>\n\n\n\n<li><strong>Loop to Reverse Digits:<\/strong>\n<ol class=\"wp-block-list\">\n<li>While &#8220;num&#8221; is greater than 0, the last digit is extracted using num % 10.<\/li>\n\n\n\n<li>This digit is appended to &#8220;palindrome_number&#8221; by multiplying palindrome_number by 10 and adding the digit.<\/li>\n\n\n\n<li>The last digit is removed from &#8220;num&#8221; using integer division by 10.<\/li>\n<\/ol>\n<\/li>\n\n\n\n<li><strong>Return Comparison:<\/strong> After the loop, the function returns True if &#8220;palindrome_number&#8221; is equal to &#8220;x&#8221;, and False otherwise.<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"5-dry-run\">Dry Run:<\/h3>\n\n\n\n<p>Let&#8217;s walk through a step-by-step execution with a sample input:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/codeanddebug.in\/blog\/wp-content\/uploads\/2025\/05\/plaindrome-number-dry-run-1024x576.png\" alt=\"\" class=\"wp-image-192\" srcset=\"https:\/\/codeanddebug.in\/blog\/wp-content\/uploads\/2025\/05\/plaindrome-number-dry-run-1024x576.png 1024w, https:\/\/codeanddebug.in\/blog\/wp-content\/uploads\/2025\/05\/plaindrome-number-dry-run-300x169.png 300w, https:\/\/codeanddebug.in\/blog\/wp-content\/uploads\/2025\/05\/plaindrome-number-dry-run-768x432.png 768w, https:\/\/codeanddebug.in\/blog\/wp-content\/uploads\/2025\/05\/plaindrome-number-dry-run-1536x864.png 1536w, https:\/\/codeanddebug.in\/blog\/wp-content\/uploads\/2025\/05\/plaindrome-number-dry-run-150x84.png 150w, https:\/\/codeanddebug.in\/blog\/wp-content\/uploads\/2025\/05\/plaindrome-number-dry-run-450x253.png 450w, https:\/\/codeanddebug.in\/blog\/wp-content\/uploads\/2025\/05\/plaindrome-number-dry-run-1200x675.png 1200w, https:\/\/codeanddebug.in\/blog\/wp-content\/uploads\/2025\/05\/plaindrome-number-dry-run.png 1600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><em>Also read about Leetcode #7 : <strong><a href=\"https:\/\/codeanddebug.in\/blog\/reverse-integer-python-program-explained\/\" target=\"_blank\" rel=\"noreferrer noopener\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-purple-color\"><span style=\"text-decoration: underline;\">Reverse Integer Python Program<\/span><\/mark><\/a><\/strong>.<\/em><\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"6-potential-edge-cases\">Potential Edge Cases:<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Negative Numbers:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Negative numbers should immediately return False.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Single-Digit Numbers:<\/strong>\n<ul class=\"wp-block-list\">\n<li>Any single-digit number should return True as it is inherently a palindrome (e.g., x = 5).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Zero:<\/strong>\n<ul class=\"wp-block-list\">\n<li>x = 0 should return True as it reads the same forward and backward.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"7-handling-edge-cases\">Handling Edge Cases:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The given code handles negative numbers and zero correctly.<\/li>\n\n\n\n<li>Single-digit numbers are also handled correctly by the loop and return comparison.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"8-time-and-space-complexity\">Time and Space Complexity:<\/h3>\n\n\n\n<p><strong>Time Complexity:<\/strong> The time complexity is <strong>&#8220;O(log10\u200b . N)&#8221;<\/strong>, where &#8220;<strong>N&#8221;<\/strong> is the absolute value of the input number. This is because the number of iterations in the loop is proportional to the number of digits in the number.<\/p>\n\n\n\n<p><strong>Space Complexity:<\/strong> The space complexity is <strong>&#8220;O(1)&#8221;<\/strong>. The function uses a fixed amount of space regardless of the input size.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"21-points-to-remember-for-competitive-programming\">Some Questions for You<\/h2>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list \">\n<div id=\"faq-question-1775293879626\" class=\"rank-math-list-item\">\n<h4 class=\"rank-math-question \">Why do negative numbers always return False in palindrome checks?<\/h4>\n<div class=\"rank-math-answer \">\n\n<p>Because of the negative sign (<code>-<\/code>). When reversed, the sign shifts position (e.g., <code>-121<\/code> \u2192 <code>121-<\/code>), which is not equal to the original number. Since the structure changes, it can never be a palindrome.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1775293893305\" class=\"rank-math-list-item\">\n<h4 class=\"rank-math-question \">Why does a number ending with 0 (like 10) fail the palindrome test?<\/h4>\n<div class=\"rank-math-answer \">\n\n<p>When reversed, leading zeros are dropped. For example, <code>10<\/code> becomes <code>01<\/code>, which is interpreted as <code>1<\/code>. Since <code>10 \u2260 1<\/code>, it is not a palindrome. This is a subtle but important edge case.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1775293898627\" class=\"rank-math-list-item\">\n<h4 class=\"rank-math-question \">Can we solve this problem without reversing the entire number?<\/h4>\n<div class=\"rank-math-answer \">\n\n<p>Yes. An optimized approach reverses only half of the number and compares it with the other half. This reduces unnecessary computation and also helps prevent integer overflow in some languages.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1775293906751\" class=\"rank-math-list-item\">\n<h4 class=\"rank-math-question \">Is there any risk of integer overflow in this approach?<\/h4>\n<div class=\"rank-math-answer \">\n\n<p>In Python, there is no risk because integers can grow arbitrarily large. However, in languages like C++ or Java, reversing the number may cause overflow, so additional checks are required.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1775293923685\" class=\"rank-math-list-item\">\n<h4 class=\"rank-math-question \">Why is the time complexity O(log\u2081\u2080N) instead of O(N)?<\/h4>\n<div class=\"rank-math-answer \">\n\n<p>Because we process digits, not individual values. Each iteration removes one digit by dividing the number by 10. So, the number of steps depends on the number of digits in <code>N<\/code>, which is approximately <code>log\u2081\u2080N<\/code>.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div class=\"wp-block-buttons alignwide is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-text-align-center wp-element-button\" href=\"https:\/\/codeanddebug.in\/course\/master-dsa-with-leetcode\" target=\"_blank\" rel=\"noreferrer noopener\">Watch our python dsa course on youtube (200+ questions)<\/a><\/div>\n<\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><em>For any changes to the document, kindly email at <a href=\"mailto:code@codeanddebug.in\">code@codeanddebug.in<\/a> or contact us at <a href=\"tel:+91-9712928220\">+91-9712928220<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hello everyone! In this article, we&#8217;ll guide you through a thorough explanation of Leetcode #9. Explaining the palindrome number program in Python. The [Problem Link] is given here for your quick reference. Examples of Palindrome Number Program in Python: Understand by watching video 1. Optimal Solution Problem Statement: Objective: The given code aims to determine<\/p>\n","protected":false},"author":1,"featured_media":193,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,4],"tags":[10],"class_list":{"0":"post-191","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-data-structures-and-algorithm","8":"category-beginner","9":"tag-math"},"featured_image_src":"https:\/\/codeanddebug.in\/blog\/wp-content\/uploads\/2025\/05\/palindrome-number-featured-image.png","author_info":{"display_name":"codeanddebug","author_link":"https:\/\/codeanddebug.in\/blog\/author\/codeanddebug\/"},"_links":{"self":[{"href":"https:\/\/codeanddebug.in\/blog\/wp-json\/wp\/v2\/posts\/191","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/codeanddebug.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/codeanddebug.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/codeanddebug.in\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/codeanddebug.in\/blog\/wp-json\/wp\/v2\/comments?post=191"}],"version-history":[{"count":3,"href":"https:\/\/codeanddebug.in\/blog\/wp-json\/wp\/v2\/posts\/191\/revisions"}],"predecessor-version":[{"id":1128,"href":"https:\/\/codeanddebug.in\/blog\/wp-json\/wp\/v2\/posts\/191\/revisions\/1128"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/codeanddebug.in\/blog\/wp-json\/wp\/v2\/media\/193"}],"wp:attachment":[{"href":"https:\/\/codeanddebug.in\/blog\/wp-json\/wp\/v2\/media?parent=191"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codeanddebug.in\/blog\/wp-json\/wp\/v2\/categories?post=191"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codeanddebug.in\/blog\/wp-json\/wp\/v2\/tags?post=191"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}