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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27 views
Infix to postfix implementation using a stack
I have implemented a "infix-to-postfix" function that takes as input a list representing the parsed expression, resulted from applying a certain regular expression to an expression, and I would like ...
3
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2answers
57 views
Sorting a Stack in ascending order
Here's my implementation of sorting a stack in ascending order. The problem statement is as follows :
Write a program to sort a stack in ascending order (with biggest items on top).
You may use ...
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2answers
44 views
Traversing a stack in my DFS algorithm for finding a path in a maze
I am trying to get this code running as fast as possible when traversing through my stack of my DFS currently the input files are like so:
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1answer
19 views
LinkedListy-Stack
I came across this interesting question while reading 'Cracking the coding Interview' and came up with a simple implementation. Any suggestions are welcomed.
Imagine a (literal) stack of plates. ...
3
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2answers
67 views
C++ Stack implementation using std::list
I have the following 'interface' to the C++ std::list and I was wondering how I could make it go faster. In particular, it needs to be able to evaluate up to two ...
10
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2answers
133 views
SortedStack implementation in Java
This is a data structure that supports the push(), pop() and isEmpty() operations and ...
7
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3answers
170 views
Simple Stack Implementation in C
This is my implementation of the stack data type in C language. It is static meaning it does not grow in size. Any suggestions or feedback would be much appreciated.
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7
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2answers
190 views
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0answers
13 views
Checking for balanced grouping characters [migrated]
This is my code for checking if a string of grouping characters is properly balanced.
It works fine on my local machine, but the online judge gives me a run-time error.
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3
votes
2answers
87 views
Memory leak in Java's stack implementation
Recently I was asked to implement a stack specifically for storing 'int' type data and find memory leaks. Isn't the garbage collector responsible for releasing all the memory? What are the possible ...
6
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2answers
322 views
Array-Based Stack Data Structure in Java
So I've recently been writing simple data structures, even though they exist in the library it helps me understand them a lot better.
Here is my code:
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2
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1answer
38 views
Postfix evaluation using a stack in c
I have written a program to evaluate a postfix expression using a stack. I had my stack implementation using a linked list reviewed here, so I am only including the header file here.
I have taken ...
8
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4answers
571 views
Array implementation of Java Stack
As an exercise, I wanted to make an array implementation of Stack, including most of the methods from the native Java Stack.
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10
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3answers
363 views
Stack implementation with move semantics
I have implemented a basic stack just for fun. I've just started learning about move constructors and assignment and move semantics as a whole, so I would really appreciate some feedback as to whether ...
5
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2answers
247 views
Stack implemented using a single linked list
I am studying data structures and I have implemented a stack using a linked list.
stack.h
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4
votes
2answers
658 views
Simple FIFO and LIFO ferry simulator
I am trying to make a ferry simulator with one ferry that works like a stack and another like a queue. I have a working class for stacks and queues with pop/push; I am trying to figure out how to ...
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2answers
101 views
Stack using two queues
I have implemented the Stack using two Queues q1 and q2 respectively as shown below in the code. I would like to get you reviews on whether it's an efficient way of implementing it or now.
For Pop ...
3
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2answers
509 views
5
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1answer
44 views
ADT stack with a dynamic array (revision 1)
Here's the second draft of my ADT stack code which I posted here before after carrying out most of the improvements suggested there.
I decided to expose a function called ...
4
votes
1answer
74 views
Stack implementation using arrays in Java
Could someone please review my code and let me know if there is any scope for optimization for better performance.
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5
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4answers
144 views
ADT stack with a dynamic array
I'm starting to learn about data structures and coding in C. The stack is the simplest of all data structures so I'm trying to implement an ADT stack with dynamically allocated array in C. This ...
4
votes
2answers
115 views
Java Max-Stack implementation to return maximum value in the stack
I have written the below program to write a Java stack implementation. I have added a method which returns the maximum value in the stack, e.g, a pop. The implementation for this is based on the Max ...
8
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3answers
394 views
Simple implementation of a generic stack
I'm fairly new to C++ programming. To help I've been writing my own data structures for practice. I'd liked this to be judged as if it was written by a professional, and receive honest feedback. I ...
3
votes
1answer
63 views
Stack implemented with a linked list
I have made a basic stack class utilizing a linked list for data storage and \$O(1)\$ push and pop and just want some basic feedback on the class to see if there is anything basic I missed. It seems ...
5
votes
1answer
247 views
Palindrome using stack
I recently started learning Java, algorithms, and data structures. I am trying to check if a string is palindrome. I would like a review to see where and how I could improve.
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5
votes
3answers
388 views
Stack Implementation in C++
This is my first template implementation. I'm trying to learn C++ and Algorithms. Any constructive criticism on code quality, readability is welcome. Everyone has their own style, but there are ...
7
votes
1answer
145 views
Stack using an array
I designed a simple drop-out stack a while back. Basically, I just want to get a few opinions on whether or not this is a good implementation and whether I am understanding the concept of a drop-out ...
10
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3answers
1k views
C++ Stack using template
I'm learning C++, so I wrote a stack with the help of templates. I'm wondering if there is anything I can improve or if I did something vastly wrong.
Stack.h
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5
votes
4answers
771 views
A data structure with push(int x), pop(), min() and max() in O(1)
I have written this Java code for a data structure which includes 3 stacks to supports four operations in \$O(1)\$: push(int x), ...
4
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3answers
38 views
Balanced expression checker
This program detects whether an expression is balanced or not. I would like to know how I can make this more efficient.
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1answer
101 views
Implemented Stack using array
I'm going to job interviews soon. How I can improve my coding style and write better code?
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3
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1answer
129 views
Priority stack in Java
I have this (simple) data structure that maintains multiple LIFO stacks. Each such stack is assigned a priority. The less is the value of a priority key, the higher the priority. Pushing operation ...
10
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1answer
473 views
Stack implementation using Swift
I would like to request some code review and feedback on a stack implementation using Swift.
Disclaimer: I might have not used protocols, optional unwrapping and error and ...
5
votes
1answer
128 views
Stack implementation using linked list in C++
I'd like some feedback for the code I wrote. I haven't programmed in C++ for two years.
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3answers
61 views
ADT Stack with a doubly circular linked list
I have managed to implement an ADTStack with a circular doubly linked list. I would like to know whether there are things I could have done better or, I should ...
6
votes
2answers
245 views
Stack implementation with a linked list
Could anyone provide any constructive criticism? I'm trying to get a jump on data structures before classes start.
One thing is that I should add a copy constructor and assignment operator. Changes ...
4
votes
2answers
50 views
ADT Stack with LinkedList
I am currently preparing for my exam and I am trying to implement some abstract data types with linked lists as preparation for the exam. I found an older exam from my prof. and he wants us to ...
8
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3answers
295 views
Generic stack in C
I tried to implement a generic stack in C using void pointers and tried to keep it as simple as possible by delegating all responsibility to the caller of the ...
6
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1answer
248 views
Lock-free bounded stack in C++11
Here is a classical attempt to implement a lock-free stack (based on this article). I rewrote it in C++11 and also tried to add memory orders which I would like to confirm to be correct.
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4
votes
1answer
91 views
Lock-free bounded stack atomics
I was thinking about using very basic bounded (preallocated) stack to keep track of my threads IDs in correct LIFO order. I was wondering if my implementation is thread safe:
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3answers
1k views
Java and C++ stack implementations with dramatically different performance
I'm developing a small programming language for use in any project I have where I feel a small scripting language could be used well. I've written two emulators for the language, one in C++ and one in ...
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1answer
147 views
C-style generic stack implementation in C#
I saw a nice generic stack implemented in C, in Stanford's CS107 Programming Paradigms course, so I tried to rewrite it in C#:
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6
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3answers
207 views
Stack with getMin method
This should implement a stack that has a \$O(1)\$ getMin method. I used an auxiliary stack. Please provide comments on my solution.
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5
votes
1answer
2k views
Sort a stack in ascending order
Sort a stack in ascending order. You may only use one additional stack to hold items.
Any comments on my solution?
Worst case complexities:
Memory complexity: O(n)
Runtime complexity: O(n^2)
Also, ...
2
votes
1answer
516 views
C++ program that recognizes a context-free language
This program (C++) was for a class project. A program that recognizes a given context-free language by implementing a pushdown-automaton (PDA).
The PDA recognizes the following language:
S → $T$
...
3
votes
1answer
356 views
Fully Generic C++ Stack Implementation Without Lists, Arrays, or Vectors
I'm trying to write a fully generic Stack in C++. I'm not sure if this is the best way to do this.
Right now I know that the Pop method needs improvement since ...
7
votes
2answers
744 views
Implementing a stack and using it to print alternate elements in reverse
Challenge:
Implement a stack interface.
Specifications:
The interface should have ‘push’ and ‘pop’ functions.
Your task is to ‘push’ a series of integers and then ‘pop’ and print every ...
4
votes
1answer
136 views
3-stack implementation with a single array
I'm teaching myself data structures and would really appreciate some feedback on my stack implementation.
A couple of things I'm not sure if I should be doing:
creation of the array and pointer ...
5
votes
3answers
2k views
Stack Implementation in Python
I have written a simple stack implementation and would like some feedback as to what I could improve in my code and coding practices.
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2
votes
4answers
280 views
Palindromes with stacks
I'm creating a simple function to verify whether or not a string is a palindrome, and must use stacks in solving it.
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