{"id":111354,"date":"2025-08-28T14:19:44","date_gmt":"2025-08-28T08:49:44","guid":{"rendered":"https:\/\/www.mygreatlearning.com\/blog\/tcs-nqt-coding-questions-answers\/"},"modified":"2026-08-13T13:59:11","modified_gmt":"2026-08-13T08:29:11","slug":"tcs-nqt-coding-questions-answers","status":"publish","type":"post","link":"https:\/\/www.mygreatlearning.com\/blog\/tcs-nqt-coding-questions-answers\/","title":{"rendered":"TCS NQT Coding Questions with Code and Explanations: Complete Guide (2026)"},"content":{"rendered":"\n<p>The <strong>TCS NQT coding round<\/strong> plays a crucial role in securing roles in Ninja, Digital, and Prime. It evaluates your ability to solve programming problems efficiently, write optimized code, and handle real exam scenarios under time constraints.<\/p>\n\n\n\n<p>Many candidates know the concepts but struggle due to inefficient solutions, incorrect input handling, or failing to pass hidden test cases. Success requires more than memorizing programs\u2014you need to understand coding patterns and optimization techniques.<\/p>\n\n\n\n<p>In this guide, you'll find the most commonly asked <strong>TCS NQT coding questions<\/strong>, optimized solutions with code, and practical tips to help you prepare confidently for the coding round.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"understanding-the-tcs-nqt-coding-section\"><strong>Understanding the TCS NQT Coding Section<\/strong><\/h2>\n\n\n\n<p>Before practicing <strong>TCS NQT coding questions<\/strong>, it's important to understand what the coding round evaluates. The focus isn't on solving complex competitive programming problems but on writing correct, optimized, and efficient code within the given time.<\/p>\n\n\n\n<p>The coding section typically includes <strong>two programming questions<\/strong> with a shared time limit. While Ninja-level questions test fundamental programming skills, Digital and Prime roles often require stronger problem-solving abilities, optimized algorithms, and proper handling of edge cases.<\/p>\n\n\n\n<p>TCS allows you to code in languages such as <a href=\"https:\/\/www.mygreatlearning.com\/blog\/python-tutorial-for-beginners-a-complete-guide\/\"><strong>Python<\/strong><\/a><strong>, <\/strong><a href=\"https:\/\/www.mygreatlearning.com\/blog\/java-tutorial-for-beginners\/\"><strong>Java<\/strong><\/a><strong>, C, C++, and Perl<\/strong>, so choose the language you're most comfortable with. Additionally, pay close attention to the input and output format, as even a correct solution can fail if it doesn't match the expected format. Understanding these requirements before you start practicing can significantly improve your performance in the coding round.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"why-candidates-lose-marks-in-the-coding-round\"><strong>Why Candidates Lose Marks in the Coding Round<\/strong><\/h2>\n\n\n\n<p>Many candidates assume that failing the coding section means their logic wasn't strong enough. In reality, that's not always the case.<\/p>\n\n\n\n<p>A large percentage of unsuccessful submissions is due to simple implementation mistakes rather than incorrect algorithms.<\/p>\n\n\n\n<p>For example, candidates often:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Misread the input format.<\/li>\n\n\n\n<li>Print extra spaces or unnecessary text.<\/li>\n\n\n\n<li>Ignore edge cases like empty <a href=\"https:\/\/www.mygreatlearning.com\/blog\/python-array\/\">arrays<\/a> or duplicate values.<\/li>\n\n\n\n<li>Use inefficient algorithms that exceed the time limit.<\/li>\n\n\n\n<li>Forget to optimize for larger inputs.<\/li>\n<\/ul>\n\n\n\n<p>The hidden test cases used by TCS are specifically designed to catch these mistakes. That's why writing clean, optimized, and robust code is more important than simply producing a working solution for the sample input.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"master-input-handling-before-solving-problems\"><strong>Master Input Handling Before Solving Problems<\/strong><\/h2>\n\n\n\n<p>One of the biggest reasons candidates fail otherwise simple questions is incorrect input handling.<\/p>\n\n\n\n<p>Unlike coding on an IDE where you can experiment freely, the TCS iON compiler expects your program to strictly follow the input format provided in the question. A small mistake while reading input can cause every hidden test case to fail, even if your algorithm is completely correct.<\/p>\n\n\n\n<p>In most coding questions, you'll encounter input formats such as:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A single integer<\/li>\n\n\n\n<li>Multiple space-separated integers<\/li>\n\n\n\n<li>An integer <strong>N<\/strong> followed by <strong>N<\/strong> lines of input<\/li>\n\n\n\n<li>Two or more strings entered on separate lines<\/li>\n<\/ul>\n\n\n\n<p>Instead of guessing the format, always read the problem statement carefully and write your input code accordingly.<\/p>\n\n\n\n<p>For Python users, using input().strip() is generally recommended because it removes leading and trailing whitespace that may otherwise cause runtime errors during integer conversion.<\/p>\n\n\n\n<p>Similarly, avoid adding extra print statements such as:<\/p>\n\n\n\n<p>Enter Number:<\/p>\n\n\n\n<p>The compiler expects only the required output. Any additional text may result in a wrong answer even if your logic is correct.<\/p>\n\n\n\n<p>Before moving to advanced algorithms, spend time practicing different input patterns. This simple habit can significantly improve your success rate during the actual exam.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"common-topics-asked-in-tcs-nqt-coding-questions\"><strong>Common Topics Asked in TCS NQT Coding Questions<\/strong><\/h2>\n\n\n\n<p>While the questions vary from one exam to another, the topics remain largely the same. Most <strong>TCS NQT coding questions<\/strong> are based on programming fundamentals such as arrays, strings, number theory, searching and sorting, recursion, stacks, queues, linked lists, trees, and basic dynamic programming.<\/p>\n\n\n\n<p>Instead of memorizing solutions, focus on understanding the logic behind each problem. This approach will help you solve different variations of similar questions with confidence. Let's start with one of the most commonly tested topics\u2014<strong>array-based coding questions<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"1-array-based-coding-questions\"><strong>1. Array-Based Coding Questions<\/strong><\/h2>\n\n\n\n<p>Arrays are among the most frequently tested topics in <strong>TCS NQT coding questions<\/strong> because they assess your understanding of loops, logic, and optimization. Common problems include finding the second largest element, removing duplicates, rotating arrays, and identifying missing numbers.<\/p>\n\n\n\n<p>While these questions may seem simple, it is important to use an optimized approach to avoid <strong>Time Limit Exceeded (TLE)<\/strong> errors on larger inputs. Let's look at one of the most commonly asked array-based coding questions.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"question-1-find-the-second-largest-number-in-an-array\"><strong>Question 1: Find the Second Largest Number in an Array<\/strong><\/h4>\n\n\n\n<p><strong>Problem Statement<\/strong><\/p>\n\n\n\n<p>Given an array of integers, return the second largest unique element present in the array.<\/p>\n\n\n\n<p><strong>Example<\/strong><\/p>\n\n\n\n<p><strong>Input<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a40a\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">input<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code>5\n\n12\n35\n1\n10\n34<\/code><\/pre><\/div>\n\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n<div id=\"copy-6a94c0c47a416\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">output<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code>34<\/code><\/pre><\/div>\n\n\n\n<p><strong>Approach<\/strong><\/p>\n\n\n\n<p>A common beginner approach is to sort the entire array and return the second last element. While this works, it is not the most efficient solution because sorting requires <strong>O(N log N)<\/strong> time.<\/p>\n\n\n\n<p>A better approach is to scan the array only once while maintaining two variables:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The largest element found so far<\/li>\n\n\n\n<li>The second largest element<\/li>\n<\/ul>\n\n\n\n<p>Whenever a larger value is encountered, update both variables accordingly. If the current value lies between the largest and second-largest values, update only the second-largest variable.<\/p>\n\n\n\n<p>This allows you to solve the problem in a single traversal without sorting the array.<\/p>\n\n\n\n<p><strong>Python Solution<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a508\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">python<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code><span class=\"kw\">def<\/span> <span class=\"fn\">find_second_largest<\/span>(arr):\n \n    <span class=\"kw\">if<\/span> <span class=\"fn\">len<\/span>(arr) &lt; <span class=\"nm\">2<\/span>:\n        <span class=\"kw\">return<\/span> <span class=\"st\">&quot;Array size must be at least 2&quot;<\/span>\n    largest = <span class=\"fn\">float<\/span>(<span class=\"st\">&#039;-inf&#039;<\/span>)\n    second_largest = <span class=\"fn\">float<\/span>(<span class=\"st\">&#039;-inf&#039;<\/span>)\n    <span class=\"kw\">for<\/span> num <span class=\"kw\">in<\/span> arr:\n        <span class=\"kw\">if<\/span> num &gt; largest:\n            second_largest = largest\n            largest = num\n        <span class=\"kw\">elif<\/span> num &gt; second_largest <span class=\"kw\">and<\/span> num != largest:\n            second_largest = num\n    <span class=\"kw\">if<\/span> second_largest == <span class=\"fn\">float<\/span>(<span class=\"st\">&#039;-inf&#039;<\/span>):\n        <span class=\"kw\">return<\/span> <span class=\"st\">&quot;No second largest element exists&quot;<\/span>\n    <span class=\"kw\">return<\/span> second_largest\n<span class=\"kw\">try<\/span>:\n    n = <span class=\"fn\">int<\/span>(<span class=\"fn\">input<\/span>().<span class=\"fn\">strip<\/span>())\n    arr = []\n    <span class=\"kw\">for<\/span> _ <span class=\"kw\">in<\/span> <span class=\"fn\">range<\/span>(n):\n        arr.<span class=\"fn\">append<\/span>(<span class=\"fn\">int<\/span>(<span class=\"fn\">input<\/span>().<span class=\"fn\">strip<\/span>()))\n    <span class=\"fn\">print<\/span>(<span class=\"fn\">find_second_largest<\/span>(arr))\n<span class=\"kw\">except<\/span> ValueError:\n    <span class=\"fn\">print<\/span>(<span class=\"st\">&quot;Invalid input&quot;<\/span>)<\/code><\/pre><\/div>\n\n\n\n<p><strong>Explanation<\/strong><\/p>\n\n\n\n<p>This solution scans the array only once, making it highly efficient for large inputs.<\/p>\n\n\n\n<p>Using float('-inf') ensures that the program correctly handles arrays containing negative numbers. It also avoids importing additional modules, keeping the solution simple and interview-friendly.<\/p>\n\n\n\n<p>The algorithm performs a single traversal of the array, resulting in O(N) time complexity and constant auxiliary space <strong>O(1)<\/strong>, making it significantly more efficient than sorting-based approaches.<\/p>\n\n\n\n<p>If you're solving <strong>TCS NQT coding questions in Python<\/strong>, building a strong foundation can help you write cleaner and more efficient solutions. Explore the <a href=\"https:\/\/www.mygreatlearning.com\/academy\/premium\/master-python-programming\"><strong>Python Programming<\/strong> <strong>course by Great Learning<\/strong><\/a> to strengthen your Python skills for coding rounds and technical interviews.\u00a0<\/p>\n\n\n\n    <div class=\"courses-cta-container\">\n        <div class=\"courses-cta-card\">\n            <div class=\"courses-cta-header\">\n                <div class=\"courses-learn-icon\"><\/div>\n                <span class=\"courses-learn-text\">Academy Pro<\/span>\n            <\/div>\n            <p class=\"courses-cta-title\">\n                <a href=\"https:\/\/www.mygreatlearning.com\/academy\/premium\/master-python-programming\" class=\"courses-cta-title-link\">Python Programming Course<\/a>\n            <\/p>\n            <p class=\"courses-cta-description\">In this course, you will learn the fundamentals of Python: from basic syntax to mastering data structures, loops, and functions. You will also explore OOP concepts and objects to build robust programs.<\/p>\n            <div class=\"courses-cta-stats\">\n                <div class=\"courses-stat-item\">\n                    <div class=\"courses-stat-icon courses-user-icon\"><\/div>\n                    <span>11.5 Hrs<\/span>\n                <\/div>\n                <div class=\"courses-stat-item\">\n                    <div class=\"courses-stat-icon courses-star-icon\"><\/div>\n                    <span>51 Coding Exercises<\/span>\n                <\/div>\n            <\/div>\n            <a href=\"https:\/\/www.mygreatlearning.com\/academy\/premium\/master-python-programming\" class=\"courses-cta-button\">\n                Start Free Trial\n                <div class=\"courses-arrow-icon\"><\/div>\n            <\/a>\n        <\/div>\n    <\/div>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"question-2-remove-duplicates-from-a-sorted-array\">Question 2: Remove Duplicates from a Sorted Array<\/h4>\n\n\n\n<p>Removing duplicate elements from a sorted array is another frequently asked TCS NQT coding question. While the problem statement is straightforward, it tests whether you understand how to modify an array efficiently without using additional memory.<\/p>\n\n\n\n<p>Since the array is already sorted, duplicate values always appear next to each other. This property allows us to solve the problem in a single traversal rather than creating another array or repeatedly searching for duplicates.<\/p>\n\n\n\n<p><strong>Problem Statement<\/strong><\/p>\n\n\n\n<p>Given a sorted array, remove duplicate elements in-place so that each unique element appears only once. Return the new length of the array.<\/p>\n\n\n\n<p><strong>Example<\/strong><\/p>\n\n\n\n<p><strong>Input<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a565\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">input<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code>1 1 2 2 3 4 4 5<\/code><\/pre><\/div>\n\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a56b\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">output<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code>1 2 3 4 5<\/code><\/pre><\/div>\n\n\n\n<p>New Length = <strong>5<\/strong><\/p>\n\n\n\n<p><strong>Approach<\/strong><\/p>\n\n\n\n<p>Instead of creating another array to store unique elements, maintain a pointer that keeps track of the position where the next unique value should be placed.<\/p>\n\n\n\n<p>The first element is always unique, so we start with the second element and compare each value to its previous one.<\/p>\n\n\n\n<p>Whenever a new value is found, copy it to the next available position and advance the pointer. If the current value is the same as the previous one, simply continue scanning the array.<\/p>\n\n\n\n<p>Because every element is visited only once, this solution is both memory-efficient and fast.<\/p>\n\n\n\n<p><strong>Python Solution<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a5b3\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">python<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code><span class=\"kw\">def<\/span> <span class=\"fn\">remove_duplicates<\/span>(arr):\n \n    <span class=\"kw\">if<\/span> <span class=\"kw\">not<\/span> arr:\n        <span class=\"kw\">return<\/span> \n    write_index = <span class=\"nm\">1<\/span>\n    <span class=\"kw\">for<\/span> i <span class=\"kw\">in<\/span> <span class=\"fn\">range<\/span>(<span class=\"nm\">1<\/span>, <span class=\"fn\">len<\/span>(arr)):\n        <span class=\"kw\">if<\/span> arr[i] != arr[i - <span class=\"nm\">1<\/span>]:\n            arr[write_index] = arr[i]\n            write_index += <span class=\"nm\">1<\/span>\n    <span class=\"kw\">return<\/span> write_index\n<span class=\"kw\">try<\/span>:\n    arr = <span class=\"fn\">list<\/span>(<span class=\"fn\">map<\/span>(int, <span class=\"fn\">input<\/span>().<span class=\"fn\">split<\/span>()))\n    new_length = <span class=\"fn\">remove_duplicates<\/span>(arr)\n    <span class=\"kw\">for<\/span> i <span class=\"kw\">in<\/span> <span class=\"fn\">range<\/span>(new_length):\n        <span class=\"fn\">print<\/span>(arr[i], end=<span class=\"st\">&quot; &quot;<\/span>)\n<span class=\"kw\">except<\/span> ValueError:\n    <span class=\"fn\">print<\/span>(<span class=\"st\">&quot;Invalid Input&quot;<\/span>)<\/code><\/pre><\/div>\n\n\n\n<p><strong>Explanation<\/strong><\/p>\n\n\n\n<p>The biggest advantage of this approach is that it modifies the original array itself instead of allocating additional memory.<\/p>\n\n\n\n<p>Since the algorithm performs only one traversal, its time complexity is <strong>O(N)<\/strong> while the auxiliary space complexity remains <strong>O(1)<\/strong>. This makes it an ideal solution for coding interviews and TCS NQT hidden test cases where memory optimization is also evaluated.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"2-string-manipulation-coding-questions\"><strong>2. String Manipulation Coding Questions<\/strong><\/h2>\n\n\n\n<p><a href=\"https:\/\/www.mygreatlearning.com\/blog\/python-string-manipulation\/\">String Manipulation<\/a> questions are another important part of the TCS NQT coding section. These problems evaluate how well you can work with characters, perform pattern matching, manipulate <a href=\"https:\/\/www.mygreatlearning.com\/blog\/python-substring\/\">substrings<\/a>, and apply logical thinking to textual data.<\/p>\n\n\n\n<p>Although string questions often look simple, they can become challenging when large inputs or multiple edge cases are involved. Efficient solutions are especially important because repeated string operations can significantly increase execution time.<\/p>\n\n\n\n<p>Some commonly asked string problems include checking whether a string is a palindrome, reversing words in a sentence, counting vowels and consonants, finding duplicate characters, and determining whether two strings are anagrams.<\/p>\n\n\n\n<p>Among these, anagram problems are one of the most frequently asked in coding assessments.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"question-3-check-whether-two-strings-are-anagrams\"><strong>Question 3: Check Whether Two Strings are Anagrams<\/strong><\/h4>\n\n\n\n<p>An anagram is formed when two words contain exactly the same characters with the same frequency but arranged in a different order.<\/p>\n\n\n\n<p>For example, <strong>\"listen\"<\/strong> and <strong>\"silent\"<\/strong> are anagrams because they contain identical letters.<\/p>\n\n\n\n<p><strong>Problem Statement<\/strong><\/p>\n\n\n\n<p>Given two strings, determine whether they are anagrams of each other.<\/p>\n\n\n\n<p><strong>Example<\/strong><\/p>\n\n\n\n<p><strong>Input<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a5ba\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">input<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code>listen\nsilent<\/code><\/pre><\/div>\n\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a5bf\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">output<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code>Yes<\/code><\/pre><\/div>\n\n\n\n<p><strong>Approach<\/strong><\/p>\n\n\n\n<p>Many beginners solve this problem by sorting both strings and comparing the results. While this approach works correctly, sorting increases the time complexity to <strong>O(N log N)<\/strong>.<\/p>\n\n\n\n<p>A more efficient solution uses a frequency dictionary (hash map).<\/p>\n\n\n\n<p>First, count how many times each character appears in the first string. Then, scan the second string and decrease the corresponding count. If any character is missing or its frequency becomes negative, the strings cannot be anagrams.<\/p>\n\n\n\n<p>This approach avoids sorting altogether and works efficiently even for very large strings.<\/p>\n\n\n\n<p><strong>Python Solution<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a624\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">python<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code><span class=\"kw\">def<\/span> <span class=\"fn\">are_anagrams<\/span>(str1, str2):\n \n    s1 = str1.<span class=\"fn\">replace<\/span>(<span class=\"st\">&quot; &quot;<\/span>, <span class=\"st\">&quot;&quot;<\/span>).<span class=\"fn\">lower<\/span>()\n    s2 = str2.<span class=\"fn\">replace<\/span>(<span class=\"st\">&quot; &quot;<\/span>, <span class=\"st\">&quot;&quot;<\/span>).<span class=\"fn\">lower<\/span>()\n    <span class=\"kw\">if<\/span> <span class=\"fn\">len<\/span>(s1) != <span class=\"fn\">len<\/span>(s2):\n        <span class=\"kw\">return<\/span> <span class=\"kw\">False<\/span>\n    char_count = {}\n    <span class=\"kw\">for<\/span> ch <span class=\"kw\">in<\/span> s1:\n        char_count[ch] = char_count.<span class=\"fn\">get<\/span>(ch, ) + <span class=\"nm\">1<\/span>\n    <span class=\"kw\">for<\/span> ch <span class=\"kw\">in<\/span> s2:\n        <span class=\"kw\">if<\/span> ch <span class=\"kw\">not<\/span> <span class=\"kw\">in<\/span> char_count <span class=\"kw\">or<\/span> char_count[ch] == :\n            <span class=\"kw\">return<\/span> <span class=\"kw\">False<\/span>\n        char_count[ch] -= <span class=\"nm\">1<\/span>\n    <span class=\"kw\">return<\/span> <span class=\"kw\">True<\/span>\n<span class=\"kw\">try<\/span>:\n    string1 = <span class=\"fn\">input<\/span>().<span class=\"fn\">strip<\/span>()\n    string2 = <span class=\"fn\">input<\/span>().<span class=\"fn\">strip<\/span>()\n    <span class=\"kw\">if<\/span> <span class=\"fn\">are_anagrams<\/span>(string1, string2):\n        <span class=\"fn\">print<\/span>(<span class=\"st\">&quot;Yes&quot;<\/span>)\n    <span class=\"kw\">else<\/span>:\n        <span class=\"fn\">print<\/span>(<span class=\"st\">&quot;No&quot;<\/span>)\n<span class=\"kw\">except<\/span> Exception:\n    <span class=\"fn\">print<\/span>(<span class=\"st\">&quot;Invalid Input&quot;<\/span>)<\/code><\/pre><\/div>\n\n\n\n<p><strong>Explanation<\/strong><\/p>\n\n\n\n<p>This solution uses a dictionary to maintain the frequency of each character rather than sorting the strings.<\/p>\n\n\n\n<p>Because each character is processed only once, the algorithm runs in <strong>O(N)<\/strong> time and requires <strong>O(N)<\/strong> additional space to store character frequencies.<\/p>\n\n\n\n<p>For Digital and Prime-level coding questions, this optimized solution is generally preferred because it performs better on larger inputs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tips-for-solving-string-problems-in-tcs-nqt\"><strong>Tips for Solving String Problems in TCS NQT<\/strong><\/h2>\n\n\n\n<p>String questions often include hidden edge cases, so following a few best practices can improve your accuracy and help you pass all test cases.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Check whether the comparison is <strong>case-sensitive<\/strong>. Convert strings to lowercase or uppercase if required.<\/li>\n\n\n\n<li>Read the problem carefully to determine whether <strong>spaces or special characters<\/strong> should be ignored.<\/li>\n\n\n\n<li>Avoid repeated <strong>string concatenation inside loops<\/strong>, especially in Python. Use lists or built-in string methods for better performance.<\/li>\n\n\n\n<li>Test your solution with <strong>edge cases<\/strong> such as empty strings, single-character inputs, duplicate characters, and strings containing spaces.<\/li>\n\n\n\n<li>Choose an <strong>optimized approach<\/strong> instead of brute-force methods to avoid Time Limit Exceeded (TLE) errors on larger inputs.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"3-number-theory-and-mathematical-coding-questions\"><strong>3. Number Theory and Mathematical Coding Questions<\/strong><\/h2>\n\n\n\n<p>Number theory questions are a regular part of the TCS NQT coding section because they evaluate your logical thinking rather than your knowledge of complex <a href=\"https:\/\/www.mygreatlearning.com\/blog\/data-structure-tutorial-for-beginners\/\">data structures<\/a>. These problems typically involve mathematical properties, efficient calculations, and edge-case handling.<\/p>\n\n\n\n<p>Although many of these questions appear straightforward, the challenge lies in choosing an optimized approach. A brute-force solution may pass the sample test cases but fail hidden tests due to higher execution time.<\/p>\n\n\n\n<p>Some of the most commonly asked mathematical coding questions include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Checking whether a number is prime<\/li>\n\n\n\n<li>Finding the Greatest Common Divisor (GCD)<\/li>\n\n\n\n<li>Generating the Fibonacci series<\/li>\n\n\n\n<li>Identifying Armstrong and Palindrome numbers<\/li>\n\n\n\n<li>Decimal to binary conversion<\/li>\n\n\n\n<li>Calculating factorials<\/li>\n\n\n\n<li>Finding LCM of two numbers<\/li>\n<\/ul>\n\n\n\n<p>Among these, prime number problems are one of the most frequently asked in the TCS NQT coding round.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"question-4-check-whether-a-number-is-prime\"><strong>Question 4: Check Whether a Number is Prime<\/strong><\/h3>\n\n\n\n<p>A prime number is a positive integer greater than 1 that is divisible only by 1 and itself.<\/p>\n\n\n\n<p>Many beginners solve this problem by checking divisibility from 2 to <strong>N-1<\/strong>. While this method works, it performs unnecessary iterations and becomes inefficient for larger numbers.<\/p>\n\n\n\n<p>A much better approach is to check divisibility only up to the square root of the given number.<\/p>\n\n\n\n<p><strong>Problem Statement<\/strong><\/p>\n\n\n\n<p>Write a program to determine whether a given number is prime.<\/p>\n\n\n\n<p><strong>Example<\/strong><\/p>\n\n\n\n<p><strong>Input<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a62a\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">input<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code>29<\/code><\/pre><\/div>\n\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a62f\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">output<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code>Prime<\/code><\/pre><\/div>\n\n\n\n<p><strong>Approach<\/strong><\/p>\n\n\n\n<p>If a number has a factor larger than its square root, it must also have another factor smaller than the square root.<\/p>\n\n\n\n<p>For example, if <strong>100<\/strong> is divisible by <strong>20<\/strong>, it is also divisible by <strong>5<\/strong>. Therefore, checking factors beyond the square root is unnecessary.<\/p>\n\n\n\n<p>The optimized solution follows these steps:<\/p>\n\n\n\n<p>First, handle the special cases where the number is less than or equal to one.<\/p>\n\n\n\n<p>Next, eliminate all even numbers except two.<\/p>\n\n\n\n<p>Finally, check only odd divisors up to the square root of the given number.<\/p>\n\n\n\n<p>This significantly reduces the number of iterations compared to checking every possible divisor.<\/p>\n\n\n\n<p><strong>Python Solution<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a676\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">python<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code><span class=\"kw\">def<\/span> <span class=\"fn\">is_prime<\/span>(n):\n \n    <span class=\"kw\">if<\/span> n &lt;= <span class=\"nm\">1<\/span>:\n        <span class=\"kw\">return<\/span> <span class=\"kw\">False<\/span>\n    <span class=\"kw\">if<\/span> n == <span class=\"nm\">2<\/span>:\n        <span class=\"kw\">return<\/span> <span class=\"kw\">True<\/span>\n    <span class=\"kw\">if<\/span> n % <span class=\"nm\">2<\/span> == :\n        <span class=\"kw\">return<\/span> <span class=\"kw\">False<\/span>\n    i = <span class=\"nm\">3<\/span>\n    <span class=\"kw\">while<\/span> i * i &lt;= n:\n        <span class=\"kw\">if<\/span> n % i == :\n            <span class=\"kw\">return<\/span> <span class=\"kw\">False<\/span>\n        i += <span class=\"nm\">2<\/span>\n    <span class=\"kw\">return<\/span> <span class=\"kw\">True<\/span>\n<span class=\"kw\">try<\/span>:\n    number = <span class=\"fn\">int<\/span>(<span class=\"fn\">input<\/span>())\n    <span class=\"kw\">if<\/span> <span class=\"fn\">is_prime<\/span>(number):\n        <span class=\"fn\">print<\/span>(<span class=\"st\">&quot;Prime&quot;<\/span>)\n    <span class=\"kw\">else<\/span>:\n        <span class=\"fn\">print<\/span>(<span class=\"st\">&quot;Not Prime&quot;<\/span>)\n<span class=\"kw\">except<\/span> ValueError:\n    <span class=\"fn\">print<\/span>(<span class=\"st\">&quot;Invalid Input&quot;<\/span>)<\/code><\/pre><\/div>\n\n\n\n<p><strong>Explanation<\/strong><\/p>\n\n\n\n<p>Instead of checking every number between <strong>2<\/strong> and <strong>N<\/strong>, this algorithm checks only the possible factors up to the square root of the number.<\/p>\n\n\n\n<p>Since half of the numbers are even, skipping them further reduces the number of iterations.<\/p>\n\n\n\n<p>As a result, the solution runs in <strong>O(\u221aN)<\/strong> time while using <strong>O(1)<\/strong> auxiliary space, making it suitable for TCS NQT coding questions as well as technical interviews.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"other-number-theory-questions-you-should-practice\"><strong>Other Number Theory Questions You Should Practice<\/strong><\/h2>\n\n\n\n<p>Along with prime number problems, you should practice other commonly asked number theory questions in the <strong>TCS NQT coding round<\/strong>, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Find the <strong>Greatest Common Divisor (GCD)<\/strong> using the Euclidean Algorithm.<\/li>\n\n\n\n<li>Generate the <strong>Fibonacci series<\/strong>.<\/li>\n\n\n\n<li>Check whether a number is an <strong>Armstrong number<\/strong>.<\/li>\n\n\n\n<li>Determine if a number is a <strong>Palindrome<\/strong>.<\/li>\n\n\n\n<li>Calculate the <strong>Factorial<\/strong> of a number.<\/li>\n\n\n\n<li>Find the <strong>Least Common Multiple (LCM)<\/strong> of two numbers.<\/li>\n\n\n\n<li>Convert <strong>Decimal to Binary<\/strong> and vice versa.<\/li>\n\n\n\n<li>Identify <strong>Perfect Numbers<\/strong>.<\/li>\n<\/ul>\n\n\n\n<p>Most of these problems test your understanding of loops, conditionals, and mathematical logic, making them essential for TCS NQT preparation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"4-advanced-coding-questions-for-digital-and-prime-roles\"><strong>4. Advanced Coding Questions for Digital and Prime Roles<\/strong><\/h2>\n\n\n\n<p>If your goal is to secure a Digital or Prime offer, basic array and string questions alone won't be enough.<\/p>\n\n\n\n<p>The coding problems for these roles often require stronger problem-solving skills, efficient algorithms, and a good understanding of data structures. Hidden test cases are designed to reject brute-force solutions, making optimization an essential part of your preparation.<\/p>\n\n\n\n<p>Instead of simply writing code that works, you should focus on reducing both time and space complexity wherever possible.<\/p>\n\n\n\n<p>Candidates preparing for higher packages should strengthen their understanding of topics such as stacks, queues, linked lists, trees, recursion, graph traversal, dynamic programming, greedy algorithms, and efficient searching and sorting techniques.<\/p>\n\n\n\n<p>One of the most frequently asked problems from this category involves validating balanced parentheses using a stack.<\/p>\n\n\n\n<p>Also Read: <a href=\"https:\/\/www.mygreatlearning.com\/blog\/linked-list-interview-questions\/\">Linked List Interview Questions and Answers<\/a>&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"question-5-check-for-balanced-parentheses\"><strong>Question 5: Check for Balanced Parentheses<\/strong><\/h3>\n\n\n\n<p>Balanced parentheses problems test your understanding of stacks and are among the most common interview questions across service-based companies.<\/p>\n\n\n\n<p>The objective is to determine whether every opening bracket has a corresponding closing bracket in the correct order.<\/p>\n\n\n\n<p><strong>Problem Statement<\/strong><\/p>\n\n\n\n<p>Given a string containing only <strong>()<\/strong>, <strong>{}<\/strong>, and <strong>[]<\/strong>, determine whether the expression is balanced.<\/p>\n\n\n\n<p><strong>Example <\/strong>1<\/p>\n\n\n\n<p><strong>Input<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a691\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">input<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code>{[()]}<\/code><\/pre><\/div>\n\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a697\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">output<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code>Balanced<\/code><\/pre><\/div>\n\n\n\n<p><strong>Example 2<\/strong><\/p>\n\n\n\n<p><strong>Input<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a6a6\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">input<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code>{[(]}<\/code><\/pre><\/div>\n\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a6ab\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">output<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code>Not Balanced<\/code><\/pre><\/div>\n\n\n\n<p><strong>Approach<\/strong><\/p>\n\n\n\n<p>A stack is the ideal data structure for solving this problem because it follows the Last-In-First-Out (LIFO) principle.<\/p>\n\n\n\n<p>Whenever an opening bracket appears, push it onto the stack.<\/p>\n\n\n\n<p>Whenever a closing bracket appears, remove the most recent opening bracket from the stack and verify that both brackets belong to the same pair.<\/p>\n\n\n\n<p>If the stack becomes empty before finding a matching bracket or contains extra opening brackets after processing the entire string, the expression is not balanced.<\/p>\n\n\n\n<p>This approach ensures that nested brackets are validated correctly.<\/p>\n\n\n\n<p><strong>Python Solution<\/strong><\/p>\n\n\n\n<div id=\"copy-6a94c0c47a709\" class=\"copy-code-wrapper\"><div class=\"copy-code-header\"><span class=\"copy-code-lang\">python<\/span><button type=\"button\" class=\"copy-button\" aria-label=\"Copy code\"><svg class=\"icon-copy\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M16 1H4C2.9 1 2 1.9 2 3V17H4V3H16V1Z\"\/><path d=\"M20 5H8C6.9 5 6 5.9 6 7V21C6 22.1 6.9 23 8 23H20C21.1 23 22 22.1 22 21V7C22 5.9 21.1 5 20 5ZM20 21H8V7H20V21Z\"\/><\/svg><svg class=\"icon-check\" viewBox=\"0 0 24 24\" aria-hidden=\"true\"><path d=\"M9 16.2L4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z\"\/><\/svg><span class=\"btn-label\">Copy<\/span><\/button><\/div><pre><code><span class=\"kw\">def<\/span> <span class=\"fn\">is_balanced<\/span>(expression):\n \n    stack = []\n    mapping = {\n        <span class=\"st\">&#039;)&#039;<\/span>: <span class=\"st\">&#039;(&#039;<\/span>,\n        <span class=\"st\">&#039;}&#039;<\/span>: <span class=\"st\">&#039;{&#039;<\/span>,\n        <span class=\"st\">&#039;]&#039;<\/span>: <span class=\"st\">&#039;[&#039;<\/span>\n    }\n    <span class=\"kw\">for<\/span> char <span class=\"kw\">in<\/span> expression:\n        <span class=\"kw\">if<\/span> char <span class=\"kw\">in<\/span> mapping:\n            top = stack.<span class=\"fn\">pop<\/span>() <span class=\"kw\">if<\/span> stack <span class=\"kw\">else<\/span> <span class=\"st\">&#039;#&#039;<\/span>\n            <span class=\"kw\">if<\/span> mapping[char] != top:\n                <span class=\"kw\">return<\/span> <span class=\"kw\">False<\/span>\n        <span class=\"kw\">else<\/span>:\n            stack.<span class=\"fn\">append<\/span>(char)\n    <span class=\"kw\">return<\/span> <span class=\"fn\">len<\/span>(stack) == \n<span class=\"kw\">try<\/span>:\n    expression = <span class=\"fn\">input<\/span>()\n    <span class=\"kw\">if<\/span> <span class=\"fn\">is_balanced<\/span>(expression):\n        <span class=\"fn\">print<\/span>(<span class=\"st\">&quot;Balanced&quot;<\/span>)\n    <span class=\"kw\">else<\/span>:\n        <span class=\"fn\">print<\/span>(<span class=\"st\">&quot;Not Balanced&quot;<\/span>)\n<span class=\"kw\">except<\/span> Exception:\n    <span class=\"fn\">print<\/span>(<span class=\"st\">&quot;Invalid Input&quot;<\/span>)<\/code><\/pre><\/div>\n\n\n\n<p><strong>Explanation<\/strong><\/p>\n\n\n\n<p>The stack always stores the most recent opening bracket.<\/p>\n\n\n\n<p>Whenever a closing bracket appears, the algorithm verifies that it matches the most recent opening bracket on the stack.<\/p>\n\n\n\n<p>If every bracket is matched successfully and the stack becomes empty at the end, the expression is balanced.<\/p>\n\n\n\n<p>The solution performs a single traversal of the string, resulting in a worst-case time complexity of <strong>O(N)<\/strong> and an auxiliary space complexity of <strong>O(N)<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"important-topics-for-digital-and-prime-coding-rounds\"><strong>Important Topics for Digital and Prime Coding Rounds<\/strong><\/h2>\n\n\n\n<p>If you're targeting <strong>TCS Digital or Prime roles<\/strong>, your preparation should go beyond basic programming concepts. These roles often include coding questions that test advanced problem-solving skills, data structures, and algorithm optimization.<\/p>\n\n\n\n<p>Focus on the following topics:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Recursion and Backtracking<\/li>\n\n\n\n<li>Binary Search<\/li>\n\n\n\n<li><a href=\"https:\/\/www.mygreatlearning.com\/blog\/merge-sort\/\">Merge Sort<\/a>, Quick Sort, <a href=\"https:\/\/www.mygreatlearning.com\/blog\/insertion-sort-algorithm\/\">Insertion Sort<\/a>, and <a href=\"https:\/\/www.mygreatlearning.com\/blog\/bubble-sort\/\">Bubble Sort<\/a><\/li>\n\n\n\n<li>Stacks and Queues<\/li>\n\n\n\n<li>Linked Lists<\/li>\n\n\n\n<li>Trees and Graph Traversal (BFS &amp; DFS)<\/li>\n\n\n\n<li>Hash Maps<\/li>\n\n\n\n<li>Greedy Algorithms<\/li>\n\n\n\n<li>Dynamic Programming (DP)<\/li>\n<\/ul>\n\n\n\n<p>Instead of memorizing solutions, understand the underlying patterns and optimize your approach. Consistent practice across these topics will help you solve challenging <strong>TCS NQT Digital and Prime coding questions<\/strong> more confidently.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"tcs-nqt-coding-preparation-strategy\"><strong>TCS NQT Coding Preparation Strategy<\/strong><\/h2>\n\n\n\n<p>Preparing for <strong>TCS NQT coding questions<\/strong> requires more than memorizing solutions. To perform well in the coding round, you need strong programming fundamentals, optimized problem-solving skills, and consistent practice under exam-like conditions. Follow these strategies to improve your coding performance and increase your chances of clearing the TCS NQT.<\/p>\n\n\n\n<p><strong>1. Strengthen Your Programming Fundamentals<\/strong><\/p>\n\n\n\n<p>Build a solid foundation by practicing arrays, strings, loops, functions, recursion, and basic mathematical problems. Strong fundamentals make it easier to solve new and unfamiliar <strong>TCS NQT coding questions<\/strong>.<\/p>\n\n\n\n<p><strong>2. Learn to Write Optimized Code<\/strong><\/p>\n\n\n\n<p>The TCS coding round evaluates both correctness and efficiency. While solving problems, always focus on reducing time and space complexity by choosing the most optimized approach.<\/p>\n\n\n\n<p>Ask yourself:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Can this solution be optimized further?<\/li>\n\n\n\n<li>Is there a more efficient algorithm?<\/li>\n\n\n\n<li>Will it pass all hidden test cases?<\/li>\n\n\n\n<li>Can I reduce the time or space complexity?<\/li>\n<\/ul>\n\n\n\n<p><strong>3. Practice Coding Under Time Constraints<\/strong><\/p>\n\n\n\n<p>Since the <strong>TCS NQT coding round<\/strong> is time-bound, practice solving coding questions with a timer. This improves your speed, accuracy, and decision-making during the actual exam.<\/p>\n\n\n\n<p><strong>4. Master Different Input and Output Formats<\/strong><\/p>\n\n\n\n<p>Many candidates lose marks because of incorrect input handling. Practice reading and processing different input formats, including:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Single integer input<\/li>\n\n\n\n<li>Space-separated integers<\/li>\n\n\n\n<li>Arrays over multiple lines<\/li>\n\n\n\n<li>Multiple string inputs<\/li>\n\n\n\n<li>Mixed integer and string inputs<\/li>\n<\/ul>\n\n\n\n<p><strong>5. Review and Learn from Your Mistakes<\/strong><\/p>\n\n\n\n<p>After every practice session, analyze the questions you couldn't solve or those that failed hidden test cases. Identifying mistakes related to logic, optimization, syntax, or input handling will help you avoid repeating them in the actual <strong>TCS NQT coding exam<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"common-mistakes-to-avoid-during-the-tcs-nqt-coding-round\"><strong>Common Mistakes to Avoid During the TCS NQT Coding Round<\/strong><\/h2>\n\n\n\n<p>Avoiding common mistakes can significantly improve your chances of clearing the <strong>TCS NQT coding round<\/strong>. Keep these points in mind while solving coding questions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Avoid brute-force solutions<\/strong> for problems with large input constraints, as they may fail hidden test cases due to high time complexity.<\/li>\n\n\n\n<li><strong>Test edge cases<\/strong> such as empty inputs, duplicate values, negative numbers, and single-element arrays before submitting your solution.<\/li>\n\n\n\n<li><strong>Follow the exact input and output format<\/strong> mentioned in the problem statement. Even an extra space or a print statement can result in an incorrect answer.<\/li>\n\n\n\n<li><strong>Don't ignore time and space complexity.<\/strong> Choose optimized algorithms whenever possible.<\/li>\n\n\n\n<li><strong>Manage your time wisely.<\/strong> If you're stuck on one question, move to the next instead of spending too much time on a single problem.<\/li>\n\n\n\n<li><strong>Double-check your code<\/strong> for syntax errors, variable initialization, and boundary conditions before submitting.<\/li>\n<\/ul>\n\n\n\n<p>Following these best practices can help you avoid unnecessary mistakes and maximize your score in the <strong>TCS NQT coding exam<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"conclusion\"><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p>Cracking the <strong>TCS NQT coding round<\/strong> requires more than just memorizing solutions. Focus on building strong programming fundamentals, understanding common coding patterns, and practicing optimized solutions for frequently asked <strong>TCS NQT coding questions<\/strong>.&nbsp;<\/p>\n\n\n\n<p>With consistent practice, effective time management, and the right preparation strategy, you'll be well-prepared to clear the coding round and improve your chances of securing a <strong>TCS Ninja, Digital, or Prime<\/strong> role.&nbsp;<\/p>\n\n\n\n<p>Also Read:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.mygreatlearning.com\/blog\/tcs-interview-questions\/\">TCS Normal Interview Questions and Answers<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mygreatlearning.com\/blog\/tcs-aptitude-questions-answers\/\">TCS Aptitude Questions and Answers<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.mygreatlearning.com\/blog\/accenture-coding-questions-solutions\/\">Accenture Coding Questions and Solutions (with code)<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Prepare for the TCS NQT coding round with commonly asked coding questions, Python solutions, detailed explanations, and practical preparation tips for Ninja, Digital, and Prime roles.<\/p>\n","protected":false},"author":41,"featured_media":119277,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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