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Home > Programming > Data Structures and Algorithms > Data Structures and Algorithms with the C++ STL
Data Structures and Algorithms with the C++ STL
Data Structures and Algorithms with the C++ STL

Data Structures and Algorithms with the C++ STL: A guide for modern C++ practitioners

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Data Structures and Algorithms with the C++ STL

The Basics of std::vector

std::vector is a fundamental component of C++ programming. This chapter will explore std::vector as a dynamic array, discussing its utility in various programming contexts. By the end of the chapter, you should be adept at declaring, initializing, and manipulating vectors. These skills will enable you to utilize std::vector effectively in diverse applications. It will provide a solid foundation for understanding the broader set of data structures and algorithms of the Standard Template Library (STL).

In this chapter, we’re going to cover the following main topics:

  • The significance of std::vector
  • Declaring and initializing std::vector
  • Accessing elements
  • Adding and removing elements

Technical requirements

The code in this chapter can be found on GitHub:

https://github.com/PacktPublishing/Data-Structures-and-Algorithms-with-the-CPP-STL

The significance of std::vector

In C++, std::vector is a frequently chosen data structure. While beginners might initially see parallels between it and the basic arrays in C, the advantages of std::vector become evident with deeper exploration. Additionally, a solid grasp of std::vector facilitates a smoother transition to understanding other components of STL.

Both vectors and arrays function as containers for collections of elements. The critical distinction between them lies in their flexibility and capabilities. Arrays are static in size, set at declaration time, and cannot be altered afterward.

In contrast, vectors are dynamic. They can expand or contract based on the operations performed on them. Unlike arrays, which commit to a fixed memory block upon declaration, vectors dynamically manage memory. They frequently allocate extra memory to anticipate future growth, optimizing efficiency and flexibility. While arrays offer simple index-based element access and modification...

Declaring and initializing std::vector

Having established the foundational knowledge of std::vector in C++ development, it’s time to delve into its practical applications—expressly, how to declare and initialize vectors.

The essence of std::vector lies in its dynamic nature. Unlike traditional arrays with fixed sizes, vectors can grow or shrink as necessary, making them a versatile tool for developers.

Declaring a vector

The performance of std::vector stems from its design, which combines the benefits of a contiguous memory layout (such as arrays) with the flexibility of dynamic resizing. It reserves memory to hold that many elements when initialized with a specified size. But if the vector fills up and more capacity is needed, it allocates a larger memory block, transfers the existing elements, and deallocates the old memory. This dynamic resizing process is optimized to reduce overhead, ensuring that vectors remain efficient. The fusion of contiguous storage...

Accessing elements

Having discussed the declaration and initialization of std::vector, our focus now shifts to accessing and manipulating the contained data. Multiple methods in C++ allow you to access vector elements with both speed and safety.

Random access

The subscript [] operator allows direct element access via indices, similar to arrays. In the following example, given a vector, the expression numbers[1] returns the value 20. However, using this operator doesn’t involve boundary checks. An index that is out of range, such as numbers[10], results in undefined behavior, leading to unpredictable outcomes.

This is shown in the following example:

#include <iostream>
#include <vector>
int main() {
  std::vector<int> numbers = {10, 20, 30, 40, 50};
  const auto secondElement = numbers[1];
  std::cout << "The second element is: " << secondElement
        ...

Adding and removing elements

One of the advantages of std::vector over traditional arrays is its ability to resize dynamically. As applications evolve, so do data requirements; static data structures do not cut it. In this section, we will explore dynamic data management with std::vector, learning to seamlessly add to and remove from vectors while making sure we are staying safe.

Adding elements

Let’s start with adding elements. The push_back() member function is possibly the most straightforward way to add an element to the end of a vector. Suppose you have std::vector<int> scores; and wish to append a new score, say 95. You would simply invoke scores.push_back(95);, and voilà, your score is added.

Here’s a simple illustrative code example:

#include <iostream>
#include <vector>
int main() {
  std::vector<int> scores;
  std::cout << "Initial size of scores: " << scores.size()
  ...

Summary

In this chapter, you have learned the foundational aspects of std::vector in C++ STL. The chapter began by explaining the significance of std::vector, highlighting its advantages over C-style arrays, particularly regarding memory management and ease of use. The chapter thoroughly compared C-style arrays and std::vector, demonstrating how std::vector facilitates dynamic size adjustment and safer memory operations.

Next, you were guided through the processes of declaring and initializing vectors. You learned how to declare std::vector and initialize these instances using different methods. The chapter then explored the myriad ways of accessing elements within std::vector, from random access to accessing the first and last elements, and underscored the importance of understanding vector size.

Further, the chapter delved into the intricacies of adding and removing elements. This section illuminated the best practices for modifying the contents of a vector, including when...

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Key benefits

  • Master the std::vector and understand why it should be your default container of choice
  • Understand each STL algorithm and its practical applications
  • Gain insights into advanced topics such as exception guarantees and thread safety
  • Purchase of the print or Kindle book includes a free PDF eBook

Description

While the Standard Template Library (STL) offers a rich set of tools for data structures and algorithms, navigating its intricacies can be daunting for intermediate C++ developers without expert guidance. This book offers a thorough exploration of the STL’s components, covering fundamental data structures, advanced algorithms, and concurrency features. Starting with an in-depth analysis of the std::vector, this book highlights its pivotal role in the STL, progressing toward building your proficiency in utilizing vectors, managing memory, and leveraging iterators. The book then advances to STL’s data structures, including sequence containers, associative containers, and unordered containers, simplifying the concepts of container adaptors and views to enhance your knowledge of modern STL programming. Shifting the focus to STL algorithms, you’ll get to grips with sorting, searching, and transformations and develop the skills to implement and modify algorithms with best practices. Advanced sections cover extending the STL with custom types and algorithms, as well as concurrency features, exception safety, and parallel algorithms. By the end of this book, you’ll have transformed into a proficient STL practitioner ready to tackle real-world challenges and build efficient and scalable C++ applications.

Who is this book for?

This book is for intermediate-level C++ developers looking to enhance their software development skills. Familiarity with basic C++ syntax and object-oriented programming (OOP) as well as some exposure to data structures and algorithms is assumed. Tailored to software engineers, computer science students, and hobbyist programmers, this book delves into C++ STL for practical application, performance enhancement, and efficient coding practices.

What you will learn

  • Streamline data handling using the std::vector
  • Master advanced usage of STL iterators
  • Optimize memory in STL containers
  • Implement custom STL allocators
  • Apply sorting and searching with STL algorithms
  • Craft STL-compatible custom types
  • Manage concurrency and ensure thread safety in STL
  • Harness the power of parallel algorithms in STL
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Publication date : Feb 29, 2024
Length: 458 pages
Edition : 1st
Language : English
ISBN-13 : 9781835468555
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Programming
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Concepts :
Data Structures and Algorithms
Tools :
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ISBN-13 : 9781835468555
Category :
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Concepts :
Data Structures and Algorithms
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Table of Contents

29 Chapters
Part 1: Mastering std::vector Chevron down icon Chevron up icon
Part 1: Mastering std::vector
Chapter 1: The Basics of std::vector Chevron down icon Chevron up icon
Chapter 1: The Basics of std::vector
Technical requirements
The significance of std::vector
Declaring and initializing std::vector
Accessing elements
Adding and removing elements
Summary
Chapter 2: Mastering Iterators with std::vector Chevron down icon Chevron up icon
Chapter 2: Mastering Iterators with std::vector
Technical requirements
Types of iterators in the STL
Basic iteration techniques with std::vector
Using std::begin and std::end
Understanding iterator requirements
Range-based for loops
Creating a custom iterator
Summary
Chapter 3: Mastering Memory and Allocators with std::vector Chevron down icon Chevron up icon
Chapter 3: Mastering Memory and Allocators with std::vector
Technical requirements
Understanding capacity versus size
Resizing and reserving memory
Custom allocator basics
Creating a custom allocator
Allocators and container performance
Summary
Chapter 4: Mastering Algorithms with std::vector Chevron down icon Chevron up icon
Chapter 4: Mastering Algorithms with std::vector
Technical requirements
Sorting a vector
Searching elements
Manipulating vectors
Custom comparators and predicates
Understanding container invariants and iterator invalidation
Summary
Chapter 5: Making a Case for std::vector Chevron down icon Chevron up icon
Chapter 5: Making a Case for std::vector
Performance considerations
Practical use cases
Versatility and efficiency
Summary
Part 2: Understanding STL Data Structures Chevron down icon Chevron up icon
Part 2: Understanding STL Data Structures
Chapter 6: Advanced Sequence Container Usage Chevron down icon Chevron up icon
Chapter 6: Advanced Sequence Container Usage
Technical requirements
std::array
std::vector
std::deque
std::list
std::forward_list
std::string
Chapter 7: Advanced Ordered Associative Container Usage Chevron down icon Chevron up icon
Chapter 7: Advanced Ordered Associative Container Usage
Technical requirements
std::set
std::map
std::multiset
std::multimap
Chapter 8: Advanced Unordered Associative Container Usage Chevron down icon Chevron up icon
Chapter 8: Advanced Unordered Associative Container Usage
Technical requirements
std::unordered_set
std::unordered_map
std::unordered_multiset
std::unordered_multimap
Chapter 9: Advanced Container Adaptor Usage Chevron down icon Chevron up icon
Chapter 9: Advanced Container Adaptor Usage
Technical requirements
std::stack
std::queue
std::priority_queue
std::flat_set
std::flat_map
std::flat_multiset
std::flat_multimap
Chapter 10: Advanced Container View Usage Chevron down icon Chevron up icon
Chapter 10: Advanced Container View Usage
Technical requirements
std::span
std::mdspan
Part 3: Mastering STL Algorithms Chevron down icon Chevron up icon
Part 3: Mastering STL Algorithms
Chapter 11: Fundamental Algorithms and Searching Chevron down icon Chevron up icon
Chapter 11: Fundamental Algorithms and Searching
Technical requirements
Sorting
Checking conditions
Counting and finding
Searching and comparison
Best practices
Summary
Chapter 12: Manipulation and Transformation Chevron down icon Chevron up icon
Chapter 12: Manipulation and Transformation
Technical requirements
Copying and moving in STL containers
Exploring return value optimization
Filling and generating in STL containers
Removing and replacing in STL containers
Swapping and reversing in STL containers
Best practices
Summary
Chapter 13: Numeric and Range -Based Operations Chevron down icon Chevron up icon
Chapter 13: Numeric and Range -Based Operations
Technical requirements
Basic numeric operations
Advanced numeric operations
Operations on sorted ranges
Best practices
Summary
Chapter 14: Permutations, Partitions, and Heaps Chevron down icon Chevron up icon
Chapter 14: Permutations, Partitions, and Heaps
Technical requirements
Partitioning
Permutations
Heap operations
Best practices
Summary
Chapter 15: STL with Ranges Chevron down icon Chevron up icon
Chapter 15: STL with Ranges
Technical requirements
Introduction to ranges
Ranges for sorting algorithms
Ranges for searching algorithms
Best practices
Summary
Part 4: Creating STL-Compatible Types and Algorithms Chevron down icon Chevron up icon
Part 4: Creating STL-Compatible Types and Algorithms
Chapter 16: Creating STL-Types Containers Chevron down icon Chevron up icon
Chapter 16: Creating STL-Types Containers
Technical requirements
The advantages of STL-compatible types
Interacting with STL algorithms
Essential requirements for compatibility
Crafting iterators for custom types
Effective operator overloading
Creating custom hash functions
Summary
Chapter 17: Creating STL -Compatible Algorithms Chevron down icon Chevron up icon
Chapter 17: Creating STL -Compatible Algorithms
Technical requirements
Template functions
Overloading
Creating generic algorithms
Customizing existing algorithms
Summary
Chapter 18: Type Traits and Policies Chevron down icon Chevron up icon
Chapter 18: Type Traits and Policies
Technical requirements
Understanding and using type traits
Utilizing type traits with the STL
Understanding and using policies in C++
Using policies with the STL
Summary
Part 5: STL Data Structures and Algorithms: Under the Hood Chevron down icon Chevron up icon
Part 5: STL Data Structures and Algorithms: Under the Hood
Chapter 19: Exception Safety Chevron down icon Chevron up icon
Chapter 19: Exception Safety
Technical requirements
Basic exception safety
Strong exception safety
The effect of noexcept on STL operations
Summary
Chapter 20: Thread Safety and Concurrency with the STL Chevron down icon Chevron up icon
Chapter 20: Thread Safety and Concurrency with the STL
Technical requirements
Concurrency versus thread safety
Understanding thread safety
Race conditions
Mutexes and locks
STL containers and thread safety
Specific container concerns
Concurrency support within the STL
Using std::thread, std::async, std::future, and thread -local storage
Concurrent data structures in the STL
Summary
Chapter 21: STL Interaction with Concepts and Coroutines Chevron down icon Chevron up icon
Chapter 21: STL Interaction with Concepts and Coroutines
Technical requirements
Concepts
Coroutines
Summary
Chapter 22: Parallel Algorithms with the STL Chevron down icon Chevron up icon
Chapter 22: Parallel Algorithms with the STL
Technical requirements
Introduction to execution policies
The impact of constexpr on algorithms and containers
Performance considerations
Summary
Index Chevron down icon Chevron up icon
Index
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Alexei Apr 22, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I am a C++ Developer, Individual Code Contributor In the Aerospace Industry, and Deep Learning AI Enthusiast (`https://www.linkedin.com/in/alexei-kondratiev/`). I just finished reading the book and would like to share my feedback: 1. This is a light overview of the C++20 STL with straightforward C++ examples and suggestions. 2. I highly recommend this book for C++ beginners to get some understanding of the C++20 STL concepts. 3. For experienced C++20 developers, it can be used as a checklist to verify the completeness of the STL skillset.
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N/A Apr 03, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I learned creating custom iterator, and memory-allocator. This was difficult for me before reading this book. I am yet to read part-2 onwards. But I liked the book till now.
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Rick Good Mar 30, 2024
Full star icon Full star icon Full star icon Full star icon Full star icon 5
"Data Structures and Algorithms with the C++ STL" is an excellent book published by Packt for anyone wanting to get better at using C++ for complex coding tasks, like organizing data and solving tricky problems. I used this book to review my concepts and as a guide for new projects. It starts with easy topics and gradually moves on to more challenging ones, covering everything from essential vector use to creating tools that work well with C++. The book is neatly divided into five main parts, making it easy to follow. By the end, you'll revisit what you already know and feel more confident tackling new coding challenges using C++. It's a handy guide, especially if you're looking to enhance your skills in C++.
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SHARON Mar 05, 2024
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Did an excellent job of presenting C++ 23 data structures and algorithms. Great examples throughout! I would highly recommend!
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April Keene Mar 06, 2024
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Great book on vectors and coverage of C++ 23. Examples used well and in-depth discussions of best practices.
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About the author

Profile icon John Farrier
John Farrier
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John Farrier, a renowned company founder and software engineer, excels in managing high-stake software projects for defense and commercial clients. As the Co-Founder and CEO of Hellebore Consulting Group, he drove substantial growth and revolutionized mission systems architectures. His technical expertise includes C++, Design Patterns, DevOps, Signal Processing, and Game Engine Design. John is a featured speaker on Organizational Leadership, Agile Project Management, C++, and Simulation. Currently, Founder and CEO of Polyrhythm Software, John continues to work to deliver exceptional software to defense and commercial sectors, advocating a robust engineering culture prioritizing collective growth and innovation.
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Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact [email protected] with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at [email protected] using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on [email protected] with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on [email protected] within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on [email protected] who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on [email protected] within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela