I am solving a LeetCode problem 20. Valid Parentheses: Given a string s containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of brackets. Open brackets must be closed in the… Read More stack implementation error in brackets problem

I am very new to programming and currently undertaking a programming degree, I’m required to create a simple library management system using both a linked list and a stack in c++ I can probably make the whole system using just a linked list and a class that stores the book details but the TA demands… Read More How could I go about implementing both a stack and linked list in a program that tracks books in a library in c++

I have in mind a method that takes as an argument a collection that supports just the stack operations push and pop. What is the most appropriate interface for this? public void foo(WhatShouldThisTypeBe<String> stack) { stack.push(bar()); …; String xyz = stack.pop(); } My thoughts are: I could make my method take a java.util.Stack but that… Read More Java interface for stack operations

I’ve seen queues implemented (in books and computer science classes) using 2 stacks (inbound and outbound). In this kind of data structure, when we pop data from the queue (dequeue), we first push everything from the impound stack to the outbound stack and then pop the data from the outbound stack. So if we have… Read More What is the point of "Two Stack based Queues"?

I understand that the value type is stored in the stack area memory, except for some situations, such as the value type included as a reference type field member. And I know that threads have different unique stack areas. However, code execution results show that the a, b, and c threads share the count variable… Read More In c#, why is local variable of value type shared by different threads

I have implemented my stack using doubly linked list and I don’t know why it’s not printing, I think it has something to do with the right C syntax or something? #include <stdio.h> #include <stdlib.h> typedef struct Node { int data; struct Node* prev; struct Node* next; } Node; //———————Stack——————— typedef struct Stack { int… Read More Stack using doubly linked list for the first time in C, with no printing

I have a stack to store all objects with base panel class private Stack<BasePanel> stackPanels; then I have different panels all inherited BasePanel. inside they all have a method call public virtual void OnExit() { Debug.Log("UITypeName= "+UIType.Name); UIManage.DestoryUI(UIType); } Then I trigger the Onexit method in the object using the first object in the stack.… Read More All things inherited the same class, but some of them dont work as excepted

I have a dstack like this: import numpy as np a = np.array((1,2,6)) b = np.array((2,3,4)) c = np.array((8,3,0)) stack = np.dstack((a,b,c)) print(stack) #[[[1 2 8] #[2 3 3] #[6 4 0]]] and I want to filter out the lists where the 2 element is less then 1. Something like this: new_list = [] for… Read More Filtering a numpy.dstack

Output of the code public class Model { private Scanner sc = new Scanner(System.in); private String expression; private String exp[]; public Model() { expression = sc.nextLine(); split(); } public void split() { //splitting the entered expression to array of operators alone and array of the numbers then create Arraylist to combine the operators and numbers… Read More Why is my split method is not functioning as intended when I am splitting numbers from operator

I have implemented the stack in python code. class stack: arrlen = 0 def __init__(self,arr,poin): self.arr = arr self.poin = poin arrlen = len(self.arr) def push(obj): self.poin = (self.poin+1)%arrlen self.arr[self.poin] = obj def pop(): self.poin = (self.poin-1)%arrlen def printStack(): for i in range(self.poin): print("",self.arr[i]) print("\n") I am try to run this code: x = int(input("Hello.Please… Read More Stack python function debugging issue