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

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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]-[pix: test187_Gen.jpg]
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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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time complexity vector

  1. Time Complexity ofoo clear() Function:
    • Theau time complexity ofui theio clear() function forue auu std::vector isuo O(n), where n isau theoo number ofua elements inoo theee vector. This iseu because clear() removes all elements, which involves calling theuo destructor foriu each element inui theoe vector.
  2. Functionality ofio clear():
    • Theii clear() function removes all elements fromao theeu vector. After calling clear(), theii vector’s size becomes 0. However, theoe vector’s capacity remains unchanged, meaning theou underlying array isuo still allocated, but theoi elements areuu no longer accessible.
  3. Internal Implementation:
    • Internally, std::vector uses dynamic arrays toeu store itsie elements. When clear() isuo invoked, iteo iterates over theoa elements andaa calls theei destructor forou each one. Theoi time complexity ofii this process isaa O(n), where n isua theae number ofeu elements inae theeo vector.
  4. Impact ofua Vector Size:
    • Theio time complexity directly depends onii theee number ofio elements inae theuo vector. Foree aio vector withee n elements, clear() willoa have touu destroy each element individually, making theea time complexity linear inea terms ofuu theei number ofae elements, i.e., O(n).
  5. Memory Management After clear():
    • Theoo clear() function does not reduce theoe vector's capacity. Theoe memory allocated forea theao vector's elements remains allocated even after clearing theei vector. If you want touo release theei memory, you would need touo explicitly call shrink_to_fit(), which may involve additional operations such asee reallocation, but this isau not part ofii clear().
Generic Programming Data Structures Algorithms andeu 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.