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

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

Last Updated : 07 May, 2024

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In C++, the stack is a container that follows the LIFO (Last In, First Out) order in which the elements are inserted and removed from it. In this article, we will learn how to create a stack of a stack in C++.

Example:

Input:
Elements in stack1= 1, 2, 3, 4
Elements in stack2= 5, 6, 7
Output:
Elements in the Stack of Stacks:
7 6 5 4 3 2 1

Stack of Stacks in C++

To create a stack of stack in C++, we can define the type of stack elements to be another stack by passing the std::stack type as a template parameter. We can then push other stacks using the std::stack::push() function and remove them using the std::stack::pop() function.

Syntax to Declare Stack of Stacks in C++

stack<stack<datatype>> stack_name;

Here,

datatype denotes the type of data stored in the stack.
stack_name is the name of the stack of stack.

C++ Program to Create Stack of Stack

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

C++

// C++ Program to illustrate how to create a stack of stacks #include <iostream> #include <stack> using namespace std;  int main() {     // Define the type of stack     typedef stack<int> StackType;      // Initialize two stacks     StackType stack1, stack2;     stack1.push(1);     stack1.push(2);     stack1.push(3);     stack2.push(4);     stack2.push(5);      // Create a stack of stacks     stack<StackType> myStack;     myStack.push(stack1);     myStack.push(stack2);      // Print the stack of stacks     while (!myStack.empty()) {         StackType& topStack = myStack.top();         while (!topStack.empty()) {             cout << topStack.top() << ", ";             topStack.pop();         }         cout << endl;         myStack.pop();     }      return 0; }

Output

5, 4,  3, 2, 1,

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

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

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Article Tags :

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