How do you implement two stacks in an array?

How do you implement two stacks in an array?

A simple way to implement two stacks is to divide the array in two halves and assign the half half space to two stacks, i.e., use arr[0] to arr[n/2] for stack1, and arr[(n/2) + 1] to arr[n-1] for stack2 where arr[] is the array to be used to implement two stacks and size of array be n.

How can I swap two stacks in Java?

In this case the code to swap two top elements is the same as for swapping two elements in an array: T temp = stack[topIndex]; stack[topIndex] = stack[topIndex – 1]; stack[topIndex – 1] = temp; You can implement this also popping two elements and pushing them back in the opposite order.

Which stack members adds an item on top of the stack?

Mainly the following three basic operations are performed in the stack:

• Push: Adds an item in the stack. If the stack is full, then it is said to be an Overflow condition.
• Pop: Removes an item from the stack.
• Peek or Top: Returns top element of stack.
• isEmpty: Returns true if stack is empty, else false.

How would you implement two queues in a single array?

A simple way to implement k queues is to divide the array in k slots of size n/k each, and fix the slots for different queues, i.e., use arr[0] to arr[n/k-1] for the first queue, and arr[n/k] to arr[2n/k-1] for queue2 where arr[] is the array to be used to implement two queues and size of array be n.

How do you swap stacks?

stack::swap() This function is used to swap the contents of one stack with another stack of same type but the size may vary. Parameters: The name of the stack with which the contents have to be swapped. Result: All the elements of the 2 stack are swapped.

How do you assign a stack to another?

Clone a stack without extra space

1. Initialize a variable count to 0.
2. Pop the top element from the source stack and store it in variable topVal.
3. Now pop the elements from the source stack and push them into the dest stack until the length of the source stack is equal to count.

What is the top of stack?

The top function returns the topmost element of the stack. You should ensure that there are one or more elements on the stack before calling the top function. The first version of the top function returns a reference to the element of the top of the stack, allowing you to modify the value.

How do you implement N stacks?

Algorithm:

1. Create an array arr of size S, which will be used to implement the stacks.
2. Create an array top of size N, and initialise all the indices to -1.
3. Create another array next of size S.
4. Initially, the complete array belongs to the free list.
5. Set the last pointer of the free list to -1, i.e. next[S-1] = -1.

How many queues minimum are needed to implement a stack?

Two Queues
Implement Stack Using Two Queues.

How to check two stacks of integers for equality?

Check two stacks for equality. Write a method equals that takes as parameters two stacks of integers and returns true if the two stacks are equal and that returns false otherwise. To be considered equal, the two stacks would have to store the same sequence of integer values in the same order.

How to check if two stacks are equal in JavaScript?

An algorithm to check if two stacks are equal in javascript. First we will check if the length of both the stacks are same, if they are not equal then return false. If the length are same, then check each element in both the stacks by peeking the elements. If they are equal then pop the elements else return false.

When are two stacks said to be the same?

Two stacks are said to be same if they contains the same elements in the same order. Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Do you have to store two stacks in the same order?

To be considered equal, the two stacks would have to store the same sequence of integer values in the same order. Your method is to examine the two stacks but must return them to their original state before terminating. You may use one stack as auxiliary storage. I’m pretty new to stacks and queues, and data structures in general.