Questions tagged [stack]

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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Stack - implementation in Java

I implemented a stack data structure without using any libraries or Java API code. ...
Mardson Diego's user avatar
2 votes
2 answers
91 views

Generic stack implementation (revision)

The below post is a follow-up of Generic stack implementation. Below follows a header-only implementation of a generic stack (inspired by stb-libraries, following these guidelines: stb-howto.txt). ...
Harith's user avatar
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Generic stack implementation

The provided code (a header-only library inspired by stb libraries] defines functions for creating a stack, pushing elements onto the stack, popping elements from the stack, peeking at the top element ...
Harith's user avatar
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11 votes
5 answers
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Detecting balanced parentheses

Objective: Given a string s containing '(', ')', '{', '}', '[', ']' (and other characters), determine if the input string is valid. An input string is valid if: ...
Harith's user avatar
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3 votes
2 answers
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Functions to simplify printing strings and numbers in amd64 Assembly

I'm new to Assembly, and this is my very first "project" in Assembly. I wanted to store data (numbers) on the stack, then access and display them. Eventually, this "experiment" of ...
ghost's user avatar
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3 votes
1 answer
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`strdup` re-implementation in assembly

I am posting a message here because I am new to assembly programming. My goal today was to re-code strdup in assembly, so to save my first parameter which is a ...
pharaoh2000's user avatar
0 votes
4 answers
765 views

Stack using doubly linked list

I have implemented my stack based on a doubly linked list. The code is tested and works; however, I am interested in any improvement ideas. ...
V_head's user avatar
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3 answers
155 views

Simple stack of integers

I've a simple push/pop implementation in my program: ...
3rdgrade-dropout's user avatar
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1 answer
65 views

Delayed, concurrent event stack in Java - follow-up

I have slightly refactored the Delayed, concurrent event stack in Java. Now it looks like this: DelayedEventStack.java ...
coderodde's user avatar
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Delayed, concurrent event stack in Java

(See the next iteration: Delayed, concurrent event stack in Java - follow-up ) Motivation I was confronted with a task of having "message events" for a GUI program. The use case is as ...
coderodde's user avatar
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4 votes
1 answer
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Queue implemented using two stacks in Swift

I need your expert opinion! In fact, for a Leetcode Problem, I had to code a queue using 2 stacks. It's shown just below and functions well. It is a pretty simple code with peek, pop, push, etc. ...
Thomas H.'s user avatar
2 votes
0 answers
64 views

C Finding strongly connected graph components in linear time using Kosaraju's algorithm

I followed this algorithm to find strongly connected graph components in C and this code works (I think ... maybe there are bugs I am not aware of). I am wondering can I please get some feedback? ...
Node.JS's user avatar
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2 votes
3 answers
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Check if parentheses are balanced using a stack implemented with a linked list

Problem: Stacks can be used to check whether the given expression has balanced symbols. This algorithm is very useful in compilers. Each time the parser reads one character at a time. If the character ...
Sol's user avatar
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2 votes
2 answers
107 views

Stack Linked list based implementaion in C++

This is my second implementation of the Stack in c++. I already implemented it as an array-based here I need a review for it to improve it and improve my coding skill. I also will but this ...
Omar_Hafez's user avatar
2 votes
2 answers
282 views

Stack array based implementation in C++

I wrote my implementation to Stack array based. And I need a review for it to improve it and improve my coding skill. I also will but this implementation on my GitHub account. One more thing: I am not ...
Omar_Hafez's user avatar
2 votes
1 answer
81 views

A (Sort of) Generic Stack Implementation in C using Macros

I spent some time implementing a generic stack in C using macros. Apart from general bugs and bad practices in my code, I was wondering about the viability of an implementation like this that uses ...
vim_overlord's user avatar
4 votes
3 answers
2k views

Infix to Postfix Converter in C++

I have written a program to convert an infix expression to postfix with the help of infix2postfix() function. Please review my code and suggest ways to make it ...
Ultimate's user avatar
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2 votes
2 answers
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Basic Stack Operations using Linked List in C

I have made a few functions for some basic stack operations using linked lists. Please review my code and suggest some ways to increase its readability. I would also love to hear ideas on how to make ...
Ultimate's user avatar
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2 votes
0 answers
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JavaScript Linter in Java

I wrote a simple Linter that checks for matching opening and closing braces for one line of JavaScript. It utilizes a stack to store opening braces found in the line, then compares the first closing ...
dbrokamp's user avatar
5 votes
2 answers
248 views

Stack implementation in C programming Language

I have tried to implement a Stack and associated functions in C, in order to understand the data structure better. Just wanted to know what do you think about my code overall. Furthermore, I am using <...
KmerPadreDiPdor's user avatar
7 votes
1 answer
371 views

Pseudo-Generic Array Stack in C

I have implemented an array based pseudo-generic stack in C using macros. The code works fine for all data types. Is it a good idea to implement such a data structure using macros? array_stack.h ...
DIVIJ_404's user avatar
3 votes
1 answer
523 views

Finding the minimum element of a stack of numbers

As part of an online programming challenge, I wrote a program that implements a stack of integers, supporting adding and removing elements, finding the last inserted element, and the minimum element. ...
gparyani's user avatar
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1 vote
0 answers
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My code generates a path through a grid - How can I simplfy it in terms of list, dictionary's, stacks and queues?

This code works but is cluttered and I think could be improved in terms of how it is implemented. Basically my code works - what it does is from the start location, it chooses a random direction and ...
Munkybunky's user avatar
1 vote
1 answer
54 views

How can I make this check balanced parenthesis implementation more concise and efficient?

I'm new to common lisp. I basically translated a procedural implementation of balanced parenthesis using a stack to common lisp. How can I make my implementation more lispy? ...
Caesar's user avatar
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-1 votes
2 answers
99 views

Optimization suggestions for my Stack [closed]

stack.hpp ...
Jaysmito Mukherjee's user avatar
2 votes
1 answer
587 views

Evaluating postfix expression on multidigit numbers

This is my solution for evaluating postfix expression using a stack. It does work on multidigit numbers, the problem I was struggling with last time. Now it works completely fine. This is the stack ...
KermitTheFrog's user avatar
3 votes
4 answers
362 views

Passing Programs To A Stack Machine Implemented In C++

I'm learning C++ by implementing a previous project I did in Python. This is a simple stack machine which evaluates mathematical expressions, e.g. pow(9, 12). The code to run this on the stack ...
redexe's user avatar
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3 votes
2 answers
104 views

Stack API for generic values

I'm trying to create a stack library from scratch. It stores generic elements which are passed in void* pointers. This is the defined structure: ...
Christian Diekmann's user avatar
3 votes
2 answers
184 views

Check for max value in stack

Got this problem in a coding interview - Get the max value of a stack in O(1). The stack contains numbers only. Please review my solution. ...
G.R's user avatar
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4 votes
2 answers
1k views

Stack Implementation in JavaScript

I am learning data structures and below is my implementation of a stack in JavaScript. I didn't want to use built in functions for an array because in JavaScript that would be too easy, so I made my ...
Jordan Baron's user avatar
2 votes
3 answers
359 views

C++ evaluating an arithmetic expression in RPN format using ADT stack

Write a program that uses an ADT Stack to evaluate arithmetic expressions in RPN format. The contents of the stack should be displayed on the screen during evaluation. The allowed arithmetic operators ...
Willow's user avatar
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7 votes
1 answer
2k views

Calculator in C - Parsing arithmetic expression using the shunting-yard algorithm

This is a simple arithmetic calculator, which parses mathematical expressions specified in infix notation using the shunting-yard algorithm. This is one of my personal projects and I would love to ...
Andy Sukowski-Bang's user avatar
1 vote
1 answer
260 views

Stack of integers in C

I'm learning C, and currently I follows C99 standard. Here is my implementation of integer-stack, which is just a stack you can do: push, pop, and print the content ...
RainningTW's user avatar
3 votes
1 answer
316 views

Python Console App | Is there a better way to go back a page?

I have a system for going back to a previously-visited page in a Python console application; it works well enough, but I feel that there could be a prettier way of doing it. Does anyone have any ...
Jake Jackson's user avatar
1 vote
0 answers
484 views

Add missing left parentheses in Java [closed]

I wanted to write a program that takes from standard input an expression without left parentheses and prints the equivalent infix expression with the parentheses inserted. For example, given the input ...
Jeff's user avatar
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3 votes
2 answers
409 views

A toy example of the concurrent stack via atomic variables and CAS pattern

I've written a toy example of the concurrent stack which has only three functions push(), peek(), and ...
user37014's user avatar
0 votes
1 answer
240 views

Generic stack implementation in C

I haven't separated the stack code into its own header and source yet, this is just a proof of concept for now. Haven't chosen better function names yet because I ultimately want to integrate this ...
liewl's user avatar
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2 votes
0 answers
113 views

Monotonic stack - complexity analysis

I tried following the official solution of LC975 (https://leetcode.com/problems/odd-even-jump/), using a monotonic stack - i.e., I reimplemented their solution (Approach 1) from python in C++. TLDR ...
Mircea's user avatar
  • 322
2 votes
1 answer
157 views

C++ implementation of a Stack with dynamic C-style array

I implemented a Stack in C++ using a dynamic C-style array. I tried sticking to the most important functions a Stack has to have to be usable. This is meant to only be for integers. I appreciate any ...
Tom Gebel's user avatar
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6 votes
2 answers
587 views

Error Code Stack Trace and Propagation Library in C

I've been programming in Go and I enjoy how easy it is to create descriptive errors and propagate them up the call stack. I wanted that sort of ease and consistency in C so I created a small error ...
Ollie's user avatar
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4 votes
1 answer
164 views

Assemble network packet on stack for iovec

The recurring problem to assemble a network packet out of payload, sequence number, header, and other misc. information is mostly solved either on the heap (e.g. appending to a ...
ernestum's user avatar
2 votes
2 answers
3k views

Dynamic Array Based Stack in C

I wrote a dynamic stack in C that uses an array as a structure. I tried to maintain O(1) for push and pop and believe I have done so. I want to know what can be written in a cleaner way and if there ...
guitarcat's user avatar
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3 votes
2 answers
1k views

Convert infix regular expression notation to postfix

This is a small part of a larger program for implementing a limited syntax regular expression constructor using Ken Thompson's construction algorithm. Converting to postfix before the regular ...
user avatar
7 votes
1 answer
6k views

Optimizing Efficiency in a Stack

I'm solving a problem on HackerRank where I'm required to implement a simple stack. It's passing all the tests except for the last 4 where it fails due to surpassing the time constraint of 10s. ...
Jonathan Spiller's user avatar
2 votes
1 answer
496 views

Kotlin Stack using an ArrayList to compare and remove elements

Is this a performant strategy to implement a stack in Kotlin to compare and delete values? Expect Create a stack in order to compare an array of asteroids (ASTs) and handle collisions (deletions), ...
AdamHurwitz's user avatar
10 votes
2 answers
643 views

An attempt at a toy Vm

I usually use c++ so it may not be best practice for c. This is a stack based toy vm and as a result it is very primitive, and it has no bitwise instructions 64k might be a bit overkill for a toy vm. ...
SomeDude's user avatar
  • 109
1 vote
1 answer
121 views

Stack Implementation Using Linked Lists

I have tried Implementing Stacks Using Linked Lists, and would like some tips and tricks regarding optimizations or ways to simplify/compact processes. It has 3 functions, Push, Pop, and Peek (For ...
Anonymous's user avatar
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1 vote
0 answers
42 views

regex on a log file utilizing stacks and queue's in Java

This would be for a MUD client, which has elements of a sort of telnet bot. Here, there's ...
Thufir's user avatar
  • 379
-3 votes
1 answer
50 views

What's wrong with this stack implementation? [closed]

My CS teacher sent me the following code for implementing the stack. I've been programming for a few years in higher-level languages, but have rather weak experience with C++. I mean, this code just ...
throwaway142's user avatar
9 votes
4 answers
4k views

Simple Stack implementation in C++

I've recently started teaching myself basic C++ and decided to implement a simple stack with pointers. ...
Bartek Pacia's user avatar

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