QUEUE WORLDS

Realms of FIFO & Double-Ended Destiny

The world of Queuesia is collapsing...

Its power comes from FIFO energy and the emerging Dual-Ended Magic.

Travel through realms, solve puzzles, restore balance.

Queue Operations O(1) Amortized
Deque Operations O(1) Both Ends

Choose Your Realm

🏆 0/10 ⭐ 0
🏰

FIFO Kingdom

Queue Basics

★ ★ ★
add() | remove() | peek()
🟦

Reversal Ruins

Reverse First K Elements

★ ★ ★
Queue + Stack Magic
🧩

Number Factory

Generate N Numbers {1,2,3}

★ ★ ★
BFS-style Generation
🟫

Adapter Archives

Queue Using Two Stacks

★ ★ ★
Add-Efficient | Remove-Efficient
🟥

Node Train Tracks

Queue Using Linked List

★ ★ ★
head → tail Traversal
💛

Unique Stream

First Non-Repeating Character

★ ★ ★
Queue + Frequency Map
🟪

Deque Dominion

Double-Ended Operations

★ ★ ★
Both-End Access
🟩

Window Fortress

Sliding Window Maximum

★ ★ ★
Monotonic Deque
🔁

Sliding Storm

BOSS: Live Window Battle

★ ★ ★
Full Dry-Run Combat
🔮

Random Nexus

Copy LL with Random Pointer

★ ★ ★
Interleave & Unweave

Realm

Quest: Loading...
Score: 0
FRONT BACK
Size: 0 Front: - Back: -

Algorithm Steps

5

Current Quest

Complete the objective...

0/0

Complexity Analysis

Time: O(?)
Space: O(?)

🧪 Sandbox Mode

Data Structure

Code Preview


            

          


          

            
            

          


          

            
Operation Log

            

          

        

      


      
      

        

          
          
📊 Algorithm Visualizer

        


        

          

            
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⏱️ Time Challenge

        


        

          

            
Select Challenge

            

              

                
🔄 Reverse K Sprint

                
Reverse first K elements under 30 seconds

                Best: --
              

              

                
🏭 Number Rush

                
Generate N numbers quickly

                Best: --
              

              

                
🪟 Window Warrior

                
Find all sliding window maximums

                Best: --
              

              

                
👹 Boss Battle

                
Defeat the Sliding Window Monster!

                Best: --
              

            

          


          
        

      


      
      

        

          
🎉 Realm Complete!

          

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              Time
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Concept Mastered

            
You learned about queue operations!