Which STL is faster?

What is the fastest container in C++?

Overall, for insertions, the vector and deque are the fastest for small types and the list is the fastest for the very large types.

How fast is STD find?

Obviously count has to perform more operations on average. std::find on average runs in O(n/2) time whereas std::count is O(n) always.

Is using STL good?

STL is well tested and reliable but it is not the fastest solution. Some of the containers allocate a lot of small memory blocks rather than one big block. If you really have a speed problem then you may consider making your own fixed-size list. But for many purposes STL is the standard solution.

Why is STL useful?

STL provides a range of data structures that are very useful in various scenarios. A lot of data structures are based on real-life applications. It is a library of container classes, algorithms, and iterators. It is a generalized library and so, its components are parameterized.

Is STD Map slow?

It will still take a day to run the benchmark, but so far it looks that std::unordered_map is 25% faster than the fastest map in the FreePascal standard library. And the best map of 45 Pascal maps is only 30% faster than std::unordered_map. Only 10 maps are faster, and 35 maps are slower.

What does STL stand for C++?

STL stands for Standard Template Library. If you’ve used C++ even in small projects, you’ve likely already used STL – which is a great thing! Using STL in C++ makes your code more expressive, simple, and easy to understand.

Are vectors faster than sets?

Vector is faster for insertion and deletion of elements at the end of the container. Set is faster for insertion and deletion of elements at the middle of the container.

How fast is Memchr?

GNU libc definitely uses the assembly version of memchr() (on any common linux distro). This is why it is so unbelievable fast. For example, if we count lines in 11Gb file (like “wc -l” does) it takes around 2.5 seconds with assembly version of memchr() from GNU libc.

Is C++ set ordered?

so yes, order is guaranteed by the C++ standard.

Can we use C++ STL in coding interview?

Yes for sure, unless they want you to implement an algorithm or a data structure in which case you’ll have to implement from scratch.

Can we use C++ STL in interview?

You should use STL unless: The question is asking for the same function/data structure, i.e do not use priority_queue or heap functions of STL, if the question is to implement a heap.

Is C++ Standard Library slow?

Large C++ projects can therefore be relatively slow to compile. The problem is largely solved by precompiled headers in modern compilers or using the module system that was added in C++20; future C++ standards are planning to expose the functionality of the standard library using modules.

Is STL required for DSA?

It’s impossible to learn STL without DSA; and DSA without STL would be C, not C++.

Is STL important for competitive programming?

Yes, STL is allowed in competitive programming and is also advised. Competitive programming is all about speed and STL gives the programmers an opportunity to code with speed and focus more on the logic rather than the code itself.

Is STL required for CP?

There are plenty of algorithms in the STL library and many functions for each container. So it’s always good to learn STL in C++ before starting CP as it saves a lot of time during a contest. Also, don’t forget to implement these data structures by yourself and learn how these data structures work.