A stack is a last in, first out (LIFO) abstract data type and data structure. Perhaps the most common use of stacks is to store subroutine arguments and return addresses.

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infix to postfix and infix to prefix: not ordering correctly [on hold]

when I type in a+b+c for an infix expression, I receive abc++ as my postfix expression and ...
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4answers
78 views

Stack implementation using only one queue in C

We start with an empty queue. For the push operation we simply insert the value to be pushed into the queue. The pop operation needs some manipulation. When we need to pop from the stack (simulated ...
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51 views

Stock span problem

The stock span problem is a financial problem where we have a series of n daily price quotes for a stock and we need to calculate span of stock’s price for all n days. The span Si of the stock’s ...
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144 views

Stack with 'getMinimum' operation

Design a Data Structure SpecialStack that supports all the stack operations like push(), pop(), isEmpty(), isFull() and an additional operation getMin() which should return minimum element from the ...
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1answer
50 views

Stack with “getMiddle” and “deleteMiddle” operation

Looking for code review, optimizations and best practices. ...
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1answer
37 views

Implement stack using a linked list

I am trying to implement Stack using a linked list. Looking for code-review, best practices and optimizations. ...
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1answer
49 views

Find the Next Greatest Element

Given an array, print the Next Greater Element (NGE) for every element. The Next Greater Element for an element x is the first greater element on the right side of x in array. Elements for which no ...
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2answers
381 views

Stack challenge - improving memory consumption

I am working on this problem: Stacks Imagine, that you are employed by a software development company. You work now on the famous "D++ project", which is devoted to the creation of a new ...
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2answers
55 views

Class that implements a queue using two stacks

I am looking for a review of my code that implements a MyQueue class which implements a queue using two stacks. ...
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2answers
143 views

How is my Java code for stack implementation?

The following example shows how to implement stack by creating user defined push() method for entering elements and pop() method ...
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6answers
2k views

Implementing a Stack in Java for Technical Interview

This code is based off the Stack implementation in Chapter 3 of Cracking The Coding Interview. I modified the code to make it compile and give me the correct output. I'd appreciate any feedback on ...
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2answers
96 views

Stack implementation using a queue

I've implemented a stack using a queue. Time complexity: \$O(n)\$ - push(), where n is the number of elements in the queue \$O(1)\$ - ...
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2answers
176 views

STL Stack Implementation

I implemented std::stack from the STL for deeper understanding of the language and memory since I still am only a beginner. I implemented the stack using a singly ...
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3answers
196 views

How does this naive stack implementation look?

Consider this naive stack implementation in Elixir: ...
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1answer
118 views

Managing People in a SimCity Clone

So I am working through a few different game ideas as I learn programming, and I could definitely use some feedback on my latest project. This is a simple SimCity clone. So far I have created a City ...
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3answers
817 views

Stack implementation using an array

I am trying a stack implementation using an array. I want to know if this approach is OK or if there is a logical problem. This program is working fine. ...
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1answer
55 views

Infix to postix conversion

I'm looking for code review, optimizations and best practices. Also verifying complexity to be O(n), where n is the string length. ...
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3answers
496 views

Implementation of stack using pointers

Please review my code and let me know how I can possibly improve it. ...
19
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1answer
315 views

Stack implemented using linked list in x86_64 assembly

I wrote a stack implementation using a singly linked list in x86_64 assembly. This stack supports the usual push/pop operations ...
6
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1answer
132 views

Balanced parentheses

Given an expression string exp, write a program to examine whether the pairs and the orders of "{","}","(",")","[","]" are correct in exp. For ...
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7answers
2k views

Check for balanced parentheses

Given an expression string exp, write a program to examine whether the pairs and the orders of "{","}","(",")","[","]" are correct in exp. For ...
6
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1answer
118 views

Functional, but not recursive, tree traversal

To learn tree traversal i implemented os.walk, tail-recursive and stack-based. Unfortunately Python doesn't support tail call optimization. How do i rewrite my ...
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2answers
110 views

Retrieve min from stack in O(1)

I wrote some Python code to solve the following problem. I'm curious to see if someone else can find a better solution, or critique my solution. How would you design a stack which, in addition to ...
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2answers
294 views

Int stack implementation

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2answers
110 views

Dynamic stack in C - new version

Not long ago, I posted this dynamic stack for review. Now I wrote a new version, which is hopefully a better one. Please take a look and let me know how I could improve performance and increase code ...
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3answers
340 views

Dynamic stack implementation

I wrote this code for a dynamic stack and would like to know what would be better if done differently. It can increase memory by a percentage and/or fixed value when needed. It can also be set to not ...
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2answers
2k views
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1answer
2k views

Postfix evaluation using a stack

I just wrote the code to evaluate a postfix expression and would like it if someone reviews it for me, it works perfectly fine but I'm having trouble adding the character "=" at the end. ...
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1answer
227 views

Multi producer/consumers lockfree stack

Can you please take a look at the following x86-64 C++ code which should implement a multi consumer/produce lockfree stack? Do you think I have missed anything? ...
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4answers
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Reviewing my implementation of a stack using linked list

I have been studying data structures, and I'm new to this. Here is my code for the push and pop operations. I considered using a node=top, so that I can avoid O(n) operations for the push (i.e. ...
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2answers
125 views

Is it needed to “beautify” this Stack implementation?

I'm just learning OOP, and I have an assignment to create a Stack. I came up with the following. Is it "beauty" enough, or to "schooly". Where can I evolve? This is the class: ...
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2answers
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Stack implementation using linked list

This is a working stack implementation using a linked list. I'm just curious to know if this is a good way of doing it. Any suggestions are welcome. Can we keep track of the number of elements in ...
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1answer
189 views

How is my implementation of an immutable stack?

Below is my implementation of an immutable stack class. The reverse function is trying to return a stack with all elements reversed. Is my implementation good? Maybe the reverse function can be ...
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1answer
172 views

Linked stack and template class [closed]

I'm having problem making this linked stack working. The compiler is giving me errors and I've been checking for half an hour and still could not figure out what is wrong with my code. Would anyone ...
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2answers
681 views

Linked stack implementation in C++

Please feel free to be as harsh as possible. Implementation file: ...
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0answers
113 views

x86_64 assembly print integer stack allocation [closed]

I have made this simple assembly program that prints an integer in hexadecimal. It works, but I don't understand why it works with only a stack size of 15, when to print a 64 bit integer including ...
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1answer
302 views

A working stack allocator

Here's an absolutely essential piece of C++ lore, a stack allocator, that will allow you to, say, allocate strings and vectors on the stack. There are 2 stack allocators I know of, here and here. The ...
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2answers
386 views

How can this simple coroutine implementation be improved?

This is a quick and dirty implementation of coroutines that implements yield by saving and restoring the stack to and from the heap. Here's an earlier version, which does the most naive possible ...
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3answers
239 views

Review implementation of stack by using pointers in C

After I had my code for stack implementation by array reviewed I wrote stack implementation by using pointers. Here's my code. Any suggestions for improvement are welcome. I'll be adding updated ...
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2answers
617 views

Review implementation of stack by using array in C

This question has become long after many updates. Click here to go down. I have implemented stack using arrays in C. Please give me suggestions on how to improve it. The purpose of writing it is ...
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3answers
205 views

Mimicking the basic interface of std::stack

I am trying to mimic std::stack in my implementation (just the basic interface - no iterators / allocators). Since I was having trouble handling all the memory ...
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2answers
388 views

Using pointers for string manipulation

I'm taking a sentence and determining whether or not it is a palindrome. I'm doing this while learning about stacks. Is there a way I can use pointers instead of ...
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1answer
267 views

Immutable C++ stack - thoughts and performance

What are your thoughts on the fallowing immutable stack implementation? It is implemented having as a basis a C# immutable stack (where garbage collector assistance does not impose using a reference ...
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2answers
119 views

Another stack implementation (in C)

I just started learning C and the online book contained the exercise 'implement a stack'. So I did, but thought I'd put it here, because I still don't feel comfortable with pointers. So here it is: ...
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3answers
543 views

Calculating postfix notation using two forms of input

My postfix program essentially allows the user two input options to calculate a postfix equation: Confirmations after each input (after an input, the user is ask for another number, operator, or ...
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2answers
429 views

Valid Parentheses

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the correct order, "()" and "()[]{}" are ...
4
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4answers
182 views

Simple static integer stack

This question is about improving my C++ coding skills. I was asked to implement a simple static integer stack in C++ as an assignment. I've come up with the following code: ...
8
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2answers
376 views

Which is the most correct pattern for using Stack.Pop?

There at least 2 patterns of using Stack.Pop ...
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2answers
487 views

RPN Evaluator that writes the results to a text file

For homework, I had to write an RPN Evaluator and write the results to a text file. I've done all that, but it feels weird, like the writing to my results text file. It also doesn't feel efficient. ...
5
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3answers
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A simple array-based Stack class in Java, what are my mistakes?

I have created a simple array-based Stack class with some methods like the actual Stack in Java. I am testing this for mistakes, but since I am learning Java and my tests may not be as comprehensive ...