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docs: Add FAANG-style interview questions for CountingError code
WHAT the file contains: - An HTML document with structured FAANG-style interview questions. - Covers multiple categories: Logic & Array Traversal, String Operations, Robustness & Edge Cases, Optimization, Code Extension, and Design & Readability. - Each section lists thought-provoking questions for deeper understanding of the `count()` method in the CountingError code. WHY this matters: - Provides a comprehensive set of interview-style questions to test problem-solving and Java fundamentals. - Encourages critical thinking about edge cases, performance, and design choices. - Acts as a study or mock-interview resource for practicing advanced coding questions. HOW it is structured: 1. HTML `ol` (ordered list) elements used to display numbered questions. 2. Sections separated by headings such as ✅ Logic, ✅ String Operations, etc. 3. Questions touch both implementation details and high-level design considerations. 4. Styling applied via inline CSS for readability. Tips & gotchas: - Content uses `Comic Sans MS` font → might not be suitable for professional documentation. - The HTML is strict DTD (HTML 4.01) which is somewhat outdated; consider HTML5 for modern compatibility. - Questions assume familiarity with Java methods like `indexOf()`, `startsWith()`, and array handling. Use-cases: - Mock interview preparation for FAANG-level coding rounds. - Classroom exercises for Java string and array concepts. - Reference material for building more robust and optimized string-processing code. - Handy guide for writing test cases and refactoring practice. Short key: docs-counting error-interview-question. Signed-off-by: https://github.com/Someshdiwan <[email protected]>
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‎Section8LoopAB/Loop 2.O/src/CountingErrors.html‎

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta http-equiv="Content-Style-Type" content="text/css">
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<title></title>
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<meta name="Author" content="Somesh Diwan">
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<meta name="Copyright" content="Somesh Diwan">
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<meta name="Generator" content="Cocoa HTML Writer">
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<meta name="CocoaVersion" content="2575.6">
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<style type="text/css">
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p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 18.0px 'Comic Sans MS'; -webkit-text-stroke: #000000}
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p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 18.0px 'Comic Sans MS'; color: #6d6d6d; -webkit-text-stroke: #6d6d6d; min-height: 25.0px}
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li.li1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 18.0px 'Comic Sans MS'; -webkit-text-stroke: #000000}
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span.s1 {font-kerning: none}
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ol.ol1 {list-style-type: decimal}
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</style>
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</head>
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<body>
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<p class="p1"><span class="s1"><b>🚀 FAANG-Style Interview Questions on the CountingError Code</b></span></p>
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<p class="p1"><span class="s1"><b>✅ Logic &amp; Array Traversal</b></span></p>
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<ol class="ol1">
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<li class="li1"><b></b><span class="s1"><b>How does the count() method traverse the 2D array? Can you identify the traversal order?</b><b></b></span></li>
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<li class="li1"><b></b><span class="s1"><b>What would happen if some rows in the array had different lengths (a jagged array)? Will the code still work?</b><b></b></span></li>
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<li class="li1"><b></b><span class="s1"><b>Can you explain what this line does and why indexOf("a") &gt;= 0 is used instead of == 0?</b><b></b></span></li>
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</ol>
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<p class="p2"><span class="s1"></span><br></p>
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<p class="p1"><span class="s1"><b>✅ String Operations</b></span></p>
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<ol class="ol1">
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<li class="li1"><b></b><span class="s1"><b>How does indexOf() perform internally? What is its time complexity for each string?</b><b></b></span></li>
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<li class="li1"><b></b><span class="s1"><b>How would you modify the code to count strings containing more than one 'a' character?</b><b></b></span></li>
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<li class="li1"><b></b><span class="s1"><b>If we wanted to count strings that start with 'a', how would the condition change?</b><b></b></span></li>
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</ol>
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<p class="p2"><span class="s1"></span><br></p>
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<p class="p1"><span class="s1"><b>✅ Robustness &amp; Edge Cases</b></span></p>
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<ol class="ol1">
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<li class="li1"><b></b><span class="s1"><b>What will happen if the input array contains null values? What if a row or a string inside the array is null?</b><b></b></span></li>
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<li class="li1"><b></b><span class="s1"><b>How can you make the count() method safe against NullPointerExceptions?</b><b></b></span></li>
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<li class="li1"><b></b><span class="s1"><b>What would be the correct output if the input array is empty (new String[0][0])?</b><b></b></span></li>
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</ol>
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<p class="p2"><span class="s1"></span><br></p>
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<p class="p1"><span class="s1"><b>✅ Optimization</b></span></p>
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<ol class="ol1">
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<li class="li1"><b></b><span class="s1"><b>Can we improve the efficiency of this method if performance becomes a concern with a large dataset?</b><b></b></span></li>
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<li class="li1"><b></b><span class="s1"><b>Would using a Set&lt;Character&gt; to check for 'a' be beneficial or unnecessary here?</b><b></b></span></li>
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<li class="li1"><b></b><span class="s1"><b>How would you parallelize this count operation using Java 8 Streams or parallel processing?</b><b></b></span></li>
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</ol>
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<p class="p2"><span class="s1"></span><br></p>
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<p class="p1"><span class="s1"><b>✅ Code Extension / Behavior Change</b></span></p>
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<ol class="ol1">
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<li class="li1"><b></b><span class="s1"><b>How would you modify the code to count all strings that contain any vowel instead of just 'a'?</b><b></b></span></li>
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<li class="li1"><b></b><span class="s1"><b>Can you make the method case-insensitive (i.e., match both 'a' and 'A')?</b><b></b></span></li>
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<li class="li1"><b></b><span class="s1"><b>Rewrite the method so that it returns a list of all strings containing 'a' rather than just the count.</b><b></b></span></li>
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</ol>
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<p class="p2"><span class="s1"></span><br></p>
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<p class="p1"><span class="s1"><b>✅ Design &amp; Readability</b></span></p>
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<ol class="ol1">
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<li class="li1"><b></b><span class="s1"><b>Would you refactor this code in any way to improve readability or testability?</b><b></b></span></li>
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<li class="li1"><b></b><span class="s1"><b>Is the method name count() descriptive enough? How would you rename it in a real-world codebase?</b><b></b></span></li>
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<li class="li1"><b></b><span class="s1"><b>How would you write a unit test for this function? What cases would you include?</b></span></li>
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</ol>
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</body>
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</html>

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