How do you find the minimum value in a stack?
Example: Consider the following SpecialStack 16 -> TOP 15 29 19 18 When getMin() is called, it should return 15, which is the minimum element in the current stack. If we pop the stack twice, the stack becomes 29 -> TOP 19 18 When getMin() is called, it should return 18, which is the minimum on the current stack.
Table of Contents
How do I create a minimal stack?
using the standard namespace;
- class stack. { // main stack to store items.
- stack s; // variable to store the minimum element.
- public: // Push a given element to the top of the stack.
- { if (s.empty())
- yes push(x); min = x;
- otherwise if (x > min) { s.
- min = x; }
- // Remove the top item from the stack and return it. void pop()
What is the minimum stack?
The minimal stack is a stack with 3 operations, 1> push (x) push element x onto the stack. 2> pop() pops the element from the stack. 3> min() gets the current minimum of the stack. 4> all operations must take O(1) time.
What is the minimum number of stacks of size n?
Discussion Forum
Que. | What is the minimum number of stacks of size n needed to implement a queue of size n? |
---|---|
b. | Two |
c. | Three |
d. | four |
answer: two |
What is the max stack?
The “Max stack” problem sets out to design a special stack that can perform these operations: push(x): push an element onto the stack. top(): Returns the element that is at the top of the stack. pop() – removes the item from the stack that is at the top. peekmax(): returns the maximum element of the stack.
How many queues are needed to implement a 1/2 3 stack?
1. To implement a stack using the queue (with only enqueue and dequeue operations), how many queues will you need? Explanation: Either insert or remove has to be an expensive operation, and the most expensive operation requires two queues.
What is the minimum number of queues required to make a stack?
How do you find the maximum value of a stack?
Now, to calculate the maximum of the main stack at any point, we can simply print the top element of the track stack.
- Step by step explanation:
- Step 1: Thrust 4, Max Current: 4.
- Step 2: Thrust 2, Max Current: 4.
- Step 3: Thrust 14, Max Current: 14.
- Step 4: Push 1, Max Current: 14.
- Step 5: Thrust 18, Max Current: 18.
How to calculate the size of a stack in Java?
Stack intStack = new Stack<> (); intStack.push(100); intStack.push(200); int index = inStack.search(100); //index will have the value 2. The size of the Stack object is given by the java.util.Stack.size() method. Returns the total number of elements in the stack.
How to find the minimum number in Java?
By calling numbers.get(), you get the value of the slot in i. The min variable in findMin() is actually the index of the minimum number in n. Change this:
How to remove a number from a stack?
Initially, the minimum element minEle on the stack is -1. Removed number: -3, since -3 is less than the minimum element, the original number being removed is minEle, which is -1, and the new minEle = 2*-1 – (-3) = 1 Removed number: 1, 1 = = minEle, so the number removed is 1 and minEle is still equal to 1.
How to store minimal elements in a stack?
We define a variable minEle that stores the current minimum element on the stack. Now the interesting part is how to handle the case when the min element is removed. To handle this, we push “2x – minEle” onto the stack instead of x so that the previous min element can be retrieved using the current minEle and its value stored on the stack.
How do you design a stack such that the minimum is 0 1?
You must design a stack that holds an integer value so that the getMinimum() function returns the minimum element in the stack. When getMinimum() is called, it should return 1, which is the minimum element on the stack. When getMinimum() is called, it should return 2, which is the minimum on the stack.
What are the operations on the stack data structure?
In computing, a stack is an abstract data type that serves as a collection of items, with two main main operations: Push, which adds an item to the collection, and . Pop, which removes the most recently added item that hasn’t been removed yet.
What is the minimum number of queues needed to implement a stack?
How many minimum queues are needed to implement a stack?
two tails
Implement the stack using two queues.
Is the entire function on the stack?
If the stack is full, there is an overflow condition. If the stack is empty, it is said to be an underflow condition. Peek or Top: Returns the top element of the stack.
What are the five basic operations on a stack?
Basic Operations When data is pushed onto the stack. peek() – Fetches the top data item on the stack, without removing it. isFull(): Check if the stack is full. isEmpty() – checks if the stack is empty.
What is the minimum number of stacks?
The minimum number of stacks required to implement a queue is two Stacks.
What is the minimum number of size stacks?
How to design and implement a special stack data structure?
1) Pull out the top element of the auxiliary stack. 2) pull the top item from the actual stack and return it. Step 1 is necessary to ensure that the auxiliary stack is also updated for future operations. 1) Return the top element of the auxiliary stack.
How to find the minimum element in the data structure?
Check if it is smaller than the top element in the second stack; if so, push it to the second stack. To pop an item, take it off the first stack. If it is the top element of the second stack, pop it from the second stack. To find the minimum element, simply return the element at the top of the second stack.
How to describe the data structure for Push, Pop and find the minimum?
Describe a stack data structure that supports “push”, “pop”, and “minimal seek” operations. “Find minimum” returns the smallest element in the stack. Good answer: store two stacks, one of which contains all the elements of the stack and one of which is a stack of minima. To push an item, push it onto the first stack.
How to get the minimum element of Stack?
Design a stack that supports pushing, popping, raising, and retrieving the minimum element in constant time. push(x) — Push item x on the stack. pop() — Removes the item at the top of the stack. top() — Get the top element. getMin() — Retrieves the minimum element on the stack.
What is the MIN MAX stack?
max stack. 2 → minStack contains the minimum elements and maxStack contains the maximum elements at the top of the stack. 3 →When you push an element onto the stack on the first check, the element is greater than the top element of maxStack or less than the top element of minStack.
How do you get Max on the stack?
What is the minimum number of queues needed to implement a priority queue?
What is the minimum number of queues needed to implement priority queuing? Two. One queue is used for the actual storage of data and another for storing priorities.
How many steps does the stack pop operation take?
Pop Operation Step 1: Check if the stack is empty. Step 2: If the stack is empty, throw an error and exit. Step 3: If the stack is not empty, access the data item pointed to by the top. Step 4: Decrease the value of top by 1.
How do you find the maximum value in a queue?
Implement a queue structure that exposes the operations: Enqueue, which adds an element to the end; Dequeue, which removes an element from the beginning; and GetMaxValue, which returns the maximum value currently stored in the queue, without removing it.
What is the ADT stack?
A stack is an ADT in which elements are added and removed from only one end (that is, the top of the stack). • A stack is a “last in, first out” LIFO structure.
How to create a stack in Min stack?
MinStack() initializes the stack object. void push (val) pushes the val element onto the stack. void pop() removes the element at the top of the stack. int top() gets the top element of the stack. int getMin() retrieves the minimum element on the stack.
How to get the minimum element of the second stack?
On the second stack, we only push the minimum element present at the time. ii) Whenever we perform a push operation on a stack. a) Push the value as it is onto a first stack. b) For the second stack, push only the minimum value. For the minimum value, compare the current value to the value present at the top of the stack.
How to create a minimal stack in leetcode?
Implement the MinStack class: MinStack() initializes the stack object. void push (val) pushes the val element onto the stack. void pop() removes the element at the top of the stack. int top() gets the top element of the stack. int getMin() retrieves the minimum element on the stack.
How to store max and min values on stack?
The idea is very simple, instead of storing a single value on the stack, we will store an object with current, maximum and minimum values. While adding the new value on the stack, we will check if the stack is empty or not. If empty, add the current value as current, maximum and minimum values.
How do you find Max in the stack?
How do you find an element in a stack?
The Stack.search(object element) method in Java is used to search for an element on the stack and get its distance from the top. This method starts the position count from 1 and not from 0. The element that is on top of the stack is considered to be at position 1.