citadel 的题目

• Candy (LC 135)
  类型：qbank
• SRE Python Fundamentals — Five-Question Set
  类型：qbank
• Real-Time Trading Event Feed Dashboard (React)
  类型：qbank
• N-ary Tree Sum + Leaf `next` Pointer
  类型：qbank
• Thread-Safe Key Call Counter
  类型：qbank
• HFT Onsite Round 3 — Sort Complexity + Linux Fundamentals + tail(n) Design
  类型：qbank
• Citadel QD On-Site Coding Ladder (3 Rounds, 3-4 Problems Each)
  类型：qbank
• Game of Life — In-Place and Infinite Board
  类型：qbank
• Single-Producer Multi-Consumer Ring Buffer
  类型：qbank
• Time-Keyed Key-Value Store (set / get-before-timestamp)
  类型：qbank
• Refactor Obfuscated C++ Code (Hidden Best-Time-To-Buy-Sell)
  类型：qbank
• Multi-Exchange BBO / NBBO Class
  类型：qbank
• Application-to-Exchange Routing OOD with Sliding-Window Alerts
  类型：qbank
• 2048 Simulation + Compress State to a `long long`
  类型：qbank
• Weighted Random Sampling with Insert / Delete
  类型：qbank
• LRU + LFU + Custom Eviction Function
  类型：qbank
• BST from Scratch (insert / search / delete) + Balancing Discussion
  类型：qbank
• Implement a Round-Robin Task Scheduler
  类型：qbank
• Largest Team Whose Members Share a Common Office Window
  类型：qbank
• Non-Consecutive Process Allocation Counting (Modulo 1e9 + 7)
  类型：qbank
• Wildcard / Regex String Matching (`*` operator)
  类型：qbank
• Order Book Pair Coding
  类型：qbank
• Task Scheduler with Priority + Lazy Deletion
  类型：qbank
• Best Time to Buy and Sell Stock — Full DP Ladder
  类型：qbank
• Implement `tac` — Reverse-Order File Reader
  类型：qbank
• Merge K Sorted Streams (OOD + Algorithm)
  类型：qbank
• Fleet Configuration and Deployment Control Plane
  类型：qbank
• Metrics Collection & Alerting System
  类型：qbank
• Behavioral / Resume Drilling Across the Loop
  类型：qbank
• GQS SWE Whiteboard: Boundary Search + Sliding-Window Top K
  类型：qbank
• When Does `min x'Qx + c'x` Have a Finite Minimum?
  类型：qbank
• EQR Alpha-Factor Research Deep-Dive + LLM Inference Stability
  类型：qbank
• Trading OA — 15-Question Probability Quickfire (30 Minutes)
  类型：qbank
• GQS Quant Phone — Correlation Range + Box-Muller-Style Sampling
  类型：qbank
• Closest Pair of Points in a 2D Plane
  类型：online_judge
• Online Batched No-Intercept Regression
  类型：online_judge
• Piecewise Linear Interpolation with Extrapolation
  类型：online_judge
• Town Temperature Regression Analysis
  类型：online_judge
• Minimum Changes for Palindromic Length-k Substrings
  类型：online_judge
• Maximum Earnings After Converting Days Off
  类型：online_judge
• Candy
  类型：online_judge
• Second Largest Distinct Value
  类型：online_judge
• Word Frequency Counter
  类型：online_judge
• FizzBuzz
  类型：online_judge
• Square and Reverse a List
  类型：online_judge
• Print a Message Repeatedly with Blank Lines
  类型：online_judge
• React Real-Time Event Feed Dashboard
  类型：online_judge
• Limit Order Book Matching Engine
  类型：online_judge
• Design a Low-Latency Bounded Queue and Size Its Capacity
  类型：online_judge
• Implement a C++ Task Scheduler with Parameterized Tasks
  类型：online_judge
• Statistics from a 256-Bucket Frequency Array
  类型：online_judge
• External Merge Sort with a Heap
  类型：online_judge
• Top K Elements in Each Sliding Window
  类型：online_judge
• Find All Elements Equal to K in a Sorted Array Using Only lower_bound
  类型：online_judge
• Connect Leaf Nodes of an N-ary Tree Using Next Pointers
  类型：online_judge
• Tree Diameter
  类型：online_judge
• Design Token Expiration Manager
  类型：online_judge
• Distinct Palindromic Substrings
  类型：online_judge
• Minimum Path Sum to Target in Binary Tree (Variant of LC 112)
  类型：online_judge
• Refactor and Optimize a Slow Function
  类型：online_judge
• Design an Order Book Class to Compute Exchange BBO and NBBO
  类型：online_judge
• Task Scheduler Supporting Insert-Delete
  类型：online_judge
• Weighted Insertion-Deletion with Random Sampling
  类型：online_judge
• 2048 Simulation Encoding-Decoding Task
  类型：online_judge
• Implement Binary Search Tree
  类型：online_judge
• Best Time to Buy and Sell Stock with Multiple Transactions
  类型：online_judge
• Best Time to Buy and Sell Stock
  类型：online_judge
• Find the Longest Path in a Tree (Tree Diameter)
  类型：online_judge
• Lazy Deletion Valid Token
  类型：online_judge
• Palindrome Detection
  类型：online_judge
• Merge K Sorted Lists with Timestamps
  类型：online_judge
• Find the Largest Team with a Core Employee
  类型：online_judge
• Regular Expression Matching
  类型：online_judge
• Merge K Sorted Arrays with OOD
  类型：online_judge
• Implement Recursive Task with Memorization
  类型：online_judge
• LRU Cache Implementation Test
  类型：online_judge
• LRU Cache Design
  类型：online_judge
• Maximum Prefix and Suffix Score
  类型：online_judge
• Maximum Path Sum in a Tree
  类型：online_judge
• Evaluate Reverse Polish Notation with Custom Operators
  类型：online_judge
• Medium Level Algorithm Question
  类型：online_judge
• LRU Cache Implementation
  类型：online_judge
• Diameter and Special Nodes in Tree
  类型：online_judge
• Maximize Prefix and Suffix String Match Score
  类型：online_judge
• Number of Distinct Palindromic Substrings
  类型：online_judge
• Token Expiry and Reset Management Problem
  类型：online_judge
• Shortest path in graph with fuel constraints and refueling stations
  类型：online_judge
• Count Palindromic Substrings in a String
  类型：online_judge
• Find Pair with Maximum Common Friends or Minimum Indices
  类型：online_judge
• Expected Position of Element in Probabilistic LRU Cache Access
  类型：online_judge
• Expected Keystrokes to Form Specific Words by Random Typing
  类型：online_judge