Freaks City

Problem Analysis Given n sequences (n ≤ 1e5) where each contains: Timestamp t (strict increasing) Count k (k ≤ 3e5) k integers Compute for each sequence x the count of unique integers across all sequences where (tx - t) < 86400 (24 hours in seconds). Constraints Partial Score (70pts): 1 ≤ n ≤ 100 Total k ≤ 100 Integer values ≤ 100 Timesta ...

Stack: Last-In-First-Out (LIFO) structure. Queue: First-In-First-Out (FIFO) structure. Both are container adaptors in C++ STL, not containers themselves. They rely on underlying containers (like deque, vector, or list) to store data, exposing only a restricted interface—no iterators or traversal methods. Standard Library Implementations The C ...

Core Queue Operations A queue is a linear data structure that enforces FIFO (First-In-First-Out) ordering. The essential primitives are: init – create an empty queue isEmpty – test for emptiness enqueue – append an element at the rear dequeue – remove the element at the front peek – inspect the front element without removal Circular Buffer Qu ...

Stacks and Queues Stacks and queues are fundamental linear data structures used for organizing and managing data in computer science. They provide specific ways to add and remove elements, which makes them suitable for a variety of applications. Stack A stack is a linear data structure that follows the Last-In, First-Out (LIFO) principle. This ...

Implementing a Queue Using Two Stacks A queue follows FIFO (First-In-First-Out), while a stack follows LIFO (Last-In-First-Out). To simulate queue behavior using stacks, two stacks are used: one for input (inStack) and one for output (outStack). Push: Elements are always pushed onto inStack. Pop/Peek: If outStack is empty, all elements from in ...

List Interface The List interface is a core component of the Java Collections Framework, extending the Collection enterface. It defines operations for ordered collections of elements. Key Characteristics Order Preservation: Elements are stored and retrieved in the sequence they were added. Duplicate Elements: Allows multiple identical elements ...

Given a binary tree where each node contains a digit (0-9), each root-to-leaf path represents a numerical value. For instance, the path 1 → 2 → 3 corresponds to the number 123. The task is to calculate the sum of all numbers represented by root-to-leaf paths. Note: A leaf node is a node with no children. Example 1 Input: [1,2,3] 1 / \ ...

Problem Solving 1.1 Evaluate Reverse Polish Notation Original Link: Code Suizhanglu Problem Link: 150. Evaluate Reverse Polish Notation - LeetCode Description Given an array of strings tokens represanting a postfix expression, compute the result of this expression. Return an integer representing the value of the expression. Notes: Valid oper ...

232. Implement Queue using Stacks Problem: Implement a first-in-first-out (FIFO) queue using only two stacks. The implemented queue should support all the functions of a normal queue (push, pop, peek, empty): Implement the MyQueue class: void push(int x): Push element x to the back of the queue. int pop(): Removes the element from the front of ...

Process Synchronization with Locks Simulating Ticket Booking System with Concurrency Requirements: Check available tickets Purchase tickets Concurrent Ticket Purchase Leading to Data Corruptoin import multiprocessing import time import json def check_tickets(user_id): with open('ticket_data.json', 'r') as file: data = json.load(f ...