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

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

Last Updated : 12 Mar, 2024

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In C++, the std::stack is a container that follows the LIFO (Last In, First Out) rule, whereas std::array is a sequence container that stores elements in contiguous memory. In this article, we will learn how to create a stack of an array in C++.

Example:

Input:   arr1 = {1, 2, 3};  arr2 = {4, 5, 6};  arr3 = {7, 8, 9};  Output:  Stack of Array: [ {1, 2, 3},                   {4, 5, 6},                   {7, 8, 9} ]

Stack of Array in C++

To create a stack 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 stack of these arrays.

Syntax to Create Stack of Array in C++

stack<array<datatype, size>> stack_name;

Here,

datatype denotes the type of data you want to store in the array.
size denotes the size of each array present in the stack.
stack_name is the name of the stack of array.

Note: The stack cannot be created with C-Style arrays as the type of the stack elements should be copy constructible and assignable.

C++ Program to Create a Stack of Arrays

The below program demonstrates how we can create a stack with an array in C++ STL.

C++

                      // C++ Program to illustrate how to create a stack of arrays  #include <array>  #include <iostream>  #include <stack>  using namespace std;    int main()  {      // Define the type of array      typedef array<int, 3> ArrayType;        // Initialize two arrays      ArrayType array1 = { 1, 2, 3 };      ArrayType array2 = { 4, 5, 6 };        // Create a stack of arrays      stack<ArrayType> myStack;      myStack.push(array1);      myStack.push(array2);        // Print the stack of arrays      while (!myStack.empty()) {          ArrayType& topArray = myStack.top();          for (int i : topArray) {              cout << i << " ";          }          cout << endl;          myStack.pop();      }        return 0;  }

Output

4 5 6   1 2 3

Time Complexity: O(N), where N is the number of array.
Auxiliary Space: O(N * M), where M is the size of each array

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

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