How to Create a Vector of Arrays in C++?

Last Updated : 12 Mar, 2024

In C++, an array is a collection of elements of a single type while vectors are dynamic arrays as they can change their size during the insertion and deletion of elements. In this article, we will learn how to create a vector of arrays in C++.

Example:

Input:   arr1 = {1, 2, 3};  arr2 = {4, 5, 6};  arr3 = {7, 8, 9};    Output:  Vector of Arrays: {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}

Creating a Vector of Arrays in C++

To create a vector of arrays in C++, we can use the std::array container provided by the STL library. The std::array is a container that encapsulates fixed-size arrays. We can then create a vector of these arrays using the following syntax:

Syntax to Declare Vector of Arrays

vector< array<datatype, size> > vec_name;

Here,

datatype denotes the type of data you want to store in the arrays.
size denotes the size of each array present in the vector.
vec_name is the name of the vector of vector.

Note: To declare a vector of plain old datatype arrays, we must store them as pointers as the vector elements should be copy constructible and assignable, and arrays is neither of them.

C++ Program to Create a Vector of Arrays

The below program demonstrates how we can create a vector of arrays in C++ STL.

C++

                      // C++ Program to illustrate how to create a vector of  // arrays  #include <array>  #include <iostream>  #include <vector>  using namespace std;    int main()  {        // Initializing a vector of arrays of size 4      vector<array<int, 4> > vec;        // Create arrays to insert into the vector      array<int, 4> arr1{ { 1, 2, 3, 4 } };      array<int, 4> arr2{ { 6, 7, 8, 9 } };        // Insert the arrays into the vector      vec.push_back(arr1);      vec.push_back(arr2);        // Print the vector of arrays      cout << "Elements in a Vector are: " << endl;      for (auto& arr : vec) {          for (auto& el : arr)              cout << el << ' ';      }        return 0;  }

Output

Elements in a Vector are:   1 2 3 4 6 7 8 9

Time Complexity: O(N), here N is the number of arrays.
Auxiliary Space: O(N * M), where M is the average size of the arrays.

How to Create Array of Arrays in C++

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