// practice ground
| # | Title | Topics | Difficulty |
|---|---|---|---|
| 401 | Crystal Signal Relay |
Graphs
|
Medium |
| 402 | Mirror Array Shift |
Arrays
Two Pointers
|
Easy |
| 403 | Binary Gate Lock |
Bit Manipulation
Simulation
|
Medium |
| 404 | Spiral Coin Collector |
Matrix
Simulation
|
Medium |
| 405 | Fortress Wall Builder |
Greedy
Intervals
|
Hard |
| 406 | Linked Segment Reversal |
Linked List
Recursion
|
Medium |
| 407 | Skyline Beacon Search |
Binary Search
Geometry
|
Hard |
| 408 | Variable Swap Machine |
Operators
Variables
|
Easy |
| 409 | Recursive Token Split |
Recursion
Strings
|
Medium |
| 410 | Priority Rescue Mission |
Graphs
Heaps / Priority Queue
|
Medium |
| 411 | Hidden Axis Rotation |
Math
Matrix
|
Medium |
| 412 | Echo Character Stream |
Characters
Queues
|
Easy |
| 413 | Forest Color Balance |
DFS
Trees
|
Medium |
| 414 | Twin Path Explorer |
Backtracking
Graphs
|
Hard |
| 415 | Prime Window Analyzer |
Number Theory
Sliding Window
|
Medium |
| 416 | Circular Stack Rotation |
Simulation
Stacks
|
Easy |
| 417 | Divide Merge Landscape |
Arrays
Divide and Conquer
|
Hard |
| 418 | Prefix Shadow Dictionary |
Strings
Trie
|
Medium |
| 419 | Balanced Road Merge |
Graphs
Union Find (Disjoint Set)
|
Hard |
| 420 | Crystal Interval Tracker |
Intervals
Sorting
|
Medium |
| 421 | Maze Reflection Escape |
BFS
Matrix
|
Hard |
| 422 | Binary Orchard |
Binary Search Tree
Trees
|
Medium |
| 423 | Operator Cascade |
Conditionals
Operators
|
Easy |
| 424 | Cipher Queue Network |
Hashing
Queues
|
Medium |
| 425 | Fractal Route Optimizer |
Divide and Conquer
Dynamic Programming
|
Hard |
