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Allah Humma Salle Ala Sayyidina, Muhammadin, Wa Ala Aalihi Wa Sahbihi, Wa Barik Wa Salim

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User Guest viewing Subject Data Structures Algorithms and Generic Programming and Topic Generic Programming

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QNo. 1: What is the time complexity of vector class clear() in C++? Generic Programming Data Structures Algorithms and Generic test187_Gen Medium (Level: Medium) [newsno: 1552.35]
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  1. Time Complexity of clear() Function
  2. Functionality of clear()
  3. Internal Implementation
  4. Impact of Vector Size
  5. Memory Management After clear()
 Allah Humma Salle Ala Sayyidina, Muhammadin, Wa Ala Aalihi Wa Sahbihi, Wa Barik Wa Salim

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  1. Time Complexity ofao clear() Function:
    • Theeu time complexity ofea theua clear() function foreu aaa std::vector isue O(n), where n isuu theue number ofoe elements inuo theeo vector. This isae because clear() removes all elements, which involves calling theio destructor forea each element inia theoe vector.
  2. Functionality ofuu clear():
    • Theoe clear() function removes all elements fromoi theio vector. After calling clear(), theoi vector’s size becomes 0. However, theia vector’s capacity remains unchanged, meaning theao underlying array isao still allocated, but theee elements areoi no longer accessible.
  3. Internal Implementation:
    • Internally, std::vector uses dynamic arrays toau store itsei elements. When clear() isui invoked, itoi iterates over theoe elements andeo calls theeu destructor forio each one. Theuu time complexity ofio this process isau O(n), where n isoo theie number ofeu elements inaa theoa vector.
  4. Impact ofao Vector Size:
    • Theeo time complexity directly depends onii theie number ofeu elements inii theue vector. Foreo aie vector withai n elements, clear() willee have toeo destroy each element individually, making theiu time complexity linear inie terms ofaa theae number ofie elements, i.e., O(n).
  5. Memory Management After clear():
    • Theoa clear() function does not reduce theeu vector's capacity. Theau memory allocated forou theoa vector's elements remains allocated even after clearing theoe vector. If you want toiu release theia memory, you would need toue explicitly call shrink_to_fit(), which may involve additional operations such asua reallocation, but this isio not part ofai clear().
Generic Programming Data Structures Algorithms andii Generic Programming test187_Gen Medium

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  1. Stroustrup, Bjarne. The C++ Programming Language. 4th ed. Boston: Addison-Wesley, 2013. ISBN 978-0321563842.
  2. Josuttis, Nicolai M. The C++ Standard Library: A Tutorial and Reference. 2nd ed. Boston: Addison-Wesley, 2012. ISBN 978-0321623218.
  3. Stroustrup, Bjarne. The C++ Programming Language (4th Edition). Boston: Addison-Wesley, 2013. ISBN 978-0321563842.
  4. Lakos, John. “Efficient Vector Management in C++.” ACM Transactions on Programming Languages and Systems 37, no. 4 (2015): 25–38. ISSN 0164-0925.