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Sep 21, 2023 · Learn how to use the reverse() function in STL to reverse a vector in C++. See examples, syntax, time complexity and code snippets for different input vectors.
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std::reverse () in C++. Last Updated : 03 Feb, 2023. reverse...
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Feb 17, 2017 · Learn how to use std::reverse, rbegin, rend, or other methods to reverse a C++ vector in place or create a reversed view. See code examples, explanations, and answers from experts and users.
Feb 3, 2023 · Learn how to use std::reverse() function to reverse the order of elements in a range of a container. See syntax, examples, time complexity and auxiliary space of this algorithm.
- Introduction to Vector
- C++ Vector STL Function std::reverse
- By Using Reverse Iterators
- Consider The Case of A 2D Vector
- Implementation - Reversing 2D Vector Rows
- Implementation - Reversing 2D Vector Columns
- GeneratedCaptionsTabForHeroSec
A vectoris a dynamically sized array that can resize itself automatically. Elements in a vector are stored in contiguous locations in memory. Vectors use random access iterators to access or navigate through the elements stored in a vector. Before we dive into the different methods, let's recall the iterators vector::begin() and vector::end(). begi...
std::reverse is a built-in function defined in the header file as template void reverse (BidirectionalIterator first, BidirectionalIterator last) std::reverse() reverses the order of elements in the range [first,last). The function takes two parameters - iterator pointing to the first element in the range an...
C++ vectors support reverse iterators vector::rbegin() and vector::rend(). rbegin() returns a reverse iterator pointing to the last element in the vector whereas rend()returns a reverse iterator pointing just in front of the first first element. We can obtain the reverse of a vector by using range constructorto create a new vector with reverse iter...
A 2D vectoris a vector with every element as a vector with variable sizes. Let's take the case of a 2D vector having 3 rows and 4 columns in each row, as shown below. On reversing the rows, we obtain the vector as shown below. Whereas on reversing the columns, we obtain the vector as shown below.
Using std::reverse() v.begin() returns an iterator pointing to the first row of the 2D vector and v.end()returns an iterator pointing to the last row. A single line of code, reverse(v.begin(),v.end())is sufficient to reverse the vector. The function swaps the rows internally in the range [v.begin(),v.end()).
Using std::reverse() To reverse the columns of a 2D vector, we need to traverse through the vector row-wise and reverse elements of each row. v.size() returns the number of rows in the 2D vector. Using a for loop, we traverse through each row and apply reverse(v[i].begin(), v[i].end()) to the ith row. v[i].begin() returns an iterator that points to...
Learn different ways to reverse a vector in C++ STL, including using std::reverse, swapping elements, and reverse iterators. Also, see how to reverse a 2D vector row-wise and column-wise.
Mar 27, 2024 · std:: reverse. Constrained algorithms, e.g. ranges::copy, ranges::sort, ... 1) Reverses the order of the elements in the range [first,last). Behaves as if applying std::iter_swap to every pair of iterators first + i and (last - i)-1 for each integer i in [ 0 ,std::distance(first, last)/2).
Jul 17, 2023 · Learn how to reverse a vector in C++ using different methods, such as swapping elements, using iterators, or the reverse function. Compare the pros and cons of each technique and optimize performance for large vectors.
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Learn how to use the reverse function template to reverse the order of the elements in a range of iterators. See the syntax, parameters, return value, example and complexity of this function.
