A Better Way to Learn

Level up your skills, and fun, today.

Problem Page
225+ Problems
15+ Categories
4 Difficulty Ranks

Meet The Juicy Guys

Solve problems to unlock and level up your collection.

G.M. Matrixov
G.M. Matrixov
Level 35
Matrix & 2D Arrays
Ability
Positional Pinpoint

Given a specific coordinate, he can identify all present structures

Priory Qu
Priory Qu
Level 31
Heaps & Priority Queues
Ability
Critical Triage

Can identify the most wounded person in a given area, and give them immediate care

Mr. Staxs
Mr. Staxs
Level 89
Monotonic Stack
Ability
Insider Trading

For any given day, he can accurately predict the stock price for the next day

Greision Traves
Greision Traves
Level 59
Graphs
Ability
World Weaver

From a single starting point, rapidly calculates the fastest route to every other known location on the map

Loke L. Optimo
Loke L. Optimo
Level 39
Greedy
Ability
Quick Grab

In any pile of treasure, can instantly identify and take the single most valuable item right in front of him

Master Bitz
Master Bitz
Level 8
Bit Manipulation
Ability
Property Flip

Can touch an object and instantly reverse its most important property

Rooty Rich
Rooty Rich
Level 60
Binary Trees
Ability
Split Decision

Knows the answer to any yes/no question

Ty P. Locke
Ty P. Locke
Level 82
Topological Sort
Ability
Chain Build

Can only build a new structure if its required components are already in place

Beacon F. Search
Beacon F. Search
Level 60
Breadth-First-Search
Ability
Concentric Scan

Can shine light to reveal all objects 10 feet away, then all objects 20 feet away, and so on

Buck E. Teer
Buck E. Teer
Level 32
Hash Map
Ability
Instant Fetch

Can instantly teleport any single item he knows the name of directly to his hand

Sly D. Payne
Sly D. Payne
Level 12
Sliding Window
Ability
Visibility Glitch

Can see infinitely in any direction as long as he is looking through a special pane

Brute Forsman
Brute Forsman
Level 59
Enumeration
Ability
Infinite Patience

When faced with a locked door, can summon a ring with every possible key and try them one-by-one

Ness T. Dollov
Ness T. Dollov
Level 97
Recursion
Ability
Unlimited Sentences

Can trap an enemy in a never-ending series of magical dolls

El Alquimista
El Alquimista
Level 84
Hash Function
Ability
Prime Essence

Can distill any complex object down into a unique drop of potion

Prof. Recursi
Prof. Recursi
Level 97
Backtracking
Ability
Temporal Rewind

Upon hitting a conflict, he can instantly rewind time to a point before the conflict

Señor Liston
Señor Liston
Level 50
Linked List
Ability
Join the Line

Instantly adds a new dancer to the very end of the conga line by only interacting with the last person

G.M. Matrixov
G.M. Matrixov
Level 83
Matrix & 2D Arrays
Ability
Positional Pinpoint

Given a specific coordinate, he can identify all present structures

Priory Qu
Priory Qu
Level 89
Heaps & Priority Queues
Ability
Critical Triage

Can identify the most wounded person in a given area, and give them immediate care

Mr. Staxs
Mr. Staxs
Level 56
Monotonic Stack
Ability
Insider Trading

For any given day, he can accurately predict the stock price for the next day

Greision Traves
Greision Traves
Level 54
Graphs
Ability
World Weaver

From a single starting point, rapidly calculates the fastest route to every other known location on the map

Loke L. Optimo
Loke L. Optimo
Level 30
Greedy
Ability
Quick Grab

In any pile of treasure, can instantly identify and take the single most valuable item right in front of him

Master Bitz
Master Bitz
Level 17
Bit Manipulation
Ability
Property Flip

Can touch an object and instantly reverse its most important property

Rooty Rich
Rooty Rich
Level 50
Binary Trees
Ability
Split Decision

Knows the answer to any yes/no question

Ty P. Locke
Ty P. Locke
Level 59
Topological Sort
Ability
Chain Build

Can only build a new structure if its required components are already in place

Beacon F. Search
Beacon F. Search
Level 54
Breadth-First-Search
Ability
Concentric Scan

Can shine light to reveal all objects 10 feet away, then all objects 20 feet away, and so on

Buck E. Teer
Buck E. Teer
Level 32
Hash Map
Ability
Instant Fetch

Can instantly teleport any single item he knows the name of directly to his hand

Sly D. Payne
Sly D. Payne
Level 82
Sliding Window
Ability
Visibility Glitch

Can see infinitely in any direction as long as he is looking through a special pane

Brute Forsman
Brute Forsman
Level 59
Enumeration
Ability
Infinite Patience

When faced with a locked door, can summon a ring with every possible key and try them one-by-one

Ness T. Dollov
Ness T. Dollov
Level 29
Recursion
Ability
Unlimited Sentences

Can trap an enemy in a never-ending series of magical dolls

El Alquimista
El Alquimista
Level 31
Hash Function
Ability
Prime Essence

Can distill any complex object down into a unique drop of potion

Prof. Recursi
Prof. Recursi
Level 91
Backtracking
Ability
Temporal Rewind

Upon hitting a conflict, he can instantly rewind time to a point before the conflict

Señor Liston
Señor Liston
Level 51
Linked List
Ability
Join the Line

Instantly adds a new dancer to the very end of the conga line by only interacting with the last person

Choose Your Challenge

Explore topics and master the ranks from Bronze to Legendary.

Browse by Topic

  • Graphs Icon Graphs
  • Linked List Icon Linked List
  • Monotonic Stack Icon Monotonic Stack
  • Hash Function Icon Hash Function
  • Recursion Icon Recursion
  • Backtracking Icon Backtracking
  • Enumeration Icon Enumeration
  • Greedy Icon Greedy
  • Heaps & Priority Queues Icon Heaps & Priority Queues
  • Matrix & 2D Arrays Icon Matrix & 2D Arrays
  • Breadth-First-Search Icon Breadth-First-Search
  • Bit Manipulation Icon Bit Manipulation
  • Sliding Window Icon Sliding Window
  • Binary Trees Icon Binary Trees
  • Topological Sort Icon Topological Sort
  • Hash Map Icon Hash Map

Master the Ranks

Bronze

Start with the fundamentals and build your confidence.

Silver

Tackle complex challenges and refine your skills.

Gold

Prove your mastery with expert-level problems.

Legendary

Become a 10x developer using legendary problems.

Pokemon X Leetcode

See if you can solve them all.

G.M. Matrixov
G.M. Matrixov
Level 35
Matrix & 2D Arrays
Ability
Positional Pinpoint

Given a specific coordinate, he can identify all present structures

Priory Qu
Priory Qu
Level 8
Heaps & Priority Queues
Ability
Critical Triage

Can identify the most wounded person in a given area, and give them immediate care

Mr. Staxs
Mr. Staxs
Level 31
Monotonic Stack
Ability
Insider Trading

For any given day, he can accurately predict the stock price for the next day

Greision Traves
Greision Traves
Level 59
Graphs
Ability
World Weaver

From a single starting point, rapidly calculates the fastest route to every other known location on the map

Loke L. Optimo
Loke L. Optimo
Level 2
Greedy
Ability
Quick Grab

In any pile of treasure, can instantly identify and take the single most valuable item right in front of him

Master Bitz
Master Bitz
Level 45
Bit Manipulation
Ability
Property Flip

Can touch an object and instantly reverse its most important property

Rooty Rich
Rooty Rich
Level 8
Binary Trees
Ability
Split Decision

Knows the answer to any yes/no question

Ty P. Locke
Ty P. Locke
Level 76
Topological Sort
Ability
Chain Build

Can only build a new structure if its required components are already in place

Beacon F. Search
Beacon F. Search
Level 90
Breadth-First-Search
Ability
Concentric Scan

Can shine light to reveal all objects 10 feet away, then all objects 20 feet away, and so on

Buck E. Teer
Buck E. Teer
Level 17
Hash Map
Ability
Instant Fetch

Can instantly teleport any single item he knows the name of directly to his hand

Sly D. Payne
Sly D. Payne
Level 63
Sliding Window
Ability
Visibility Glitch

Can see infinitely in any direction as long as he is looking through a special pane

Brute Forsman
Brute Forsman
Level 84
Enumeration
Ability
Infinite Patience

When faced with a locked door, can summon a ring with every possible key and try them one-by-one

Ness T. Dollov
Ness T. Dollov
Level 97
Recursion
Ability
Unlimited Sentences

Can trap an enemy in a never-ending series of magical dolls

El Alquimista
El Alquimista
Level 39
Hash Function
Ability
Prime Essence

Can distill any complex object down into a unique drop of potion

Prof. Recursi
Prof. Recursi
Level 82
Backtracking
Ability
Temporal Rewind

Upon hitting a conflict, he can instantly rewind time to a point before the conflict

Señor Liston
Señor Liston
Level 29
Linked List
Ability
Join the Line

Instantly adds a new dancer to the very end of the conga line by only interacting with the last person

G.M. Matrixov
G.M. Matrixov
Level 63
Matrix & 2D Arrays
Ability
Positional Pinpoint

Given a specific coordinate, he can identify all present structures

Priory Qu
Priory Qu
Level 73
Heaps & Priority Queues
Ability
Critical Triage

Can identify the most wounded person in a given area, and give them immediate care

Mr. Staxs
Mr. Staxs
Level 54
Monotonic Stack
Ability
Insider Trading

For any given day, he can accurately predict the stock price for the next day

Greision Traves
Greision Traves
Level 51
Graphs
Ability
World Weaver

From a single starting point, rapidly calculates the fastest route to every other known location on the map

Loke L. Optimo
Loke L. Optimo
Level 8
Greedy
Ability
Quick Grab

In any pile of treasure, can instantly identify and take the single most valuable item right in front of him

Master Bitz
Master Bitz
Level 77
Bit Manipulation
Ability
Property Flip

Can touch an object and instantly reverse its most important property

Rooty Rich
Rooty Rich
Level 66
Binary Trees
Ability
Split Decision

Knows the answer to any yes/no question

Ty P. Locke
Ty P. Locke
Level 30
Topological Sort
Ability
Chain Build

Can only build a new structure if its required components are already in place

Beacon F. Search
Beacon F. Search
Level 30
Breadth-First-Search
Ability
Concentric Scan

Can shine light to reveal all objects 10 feet away, then all objects 20 feet away, and so on

Buck E. Teer
Buck E. Teer
Level 35
Hash Map
Ability
Instant Fetch

Can instantly teleport any single item he knows the name of directly to his hand

Sly D. Payne
Sly D. Payne
Level 27
Sliding Window
Ability
Visibility Glitch

Can see infinitely in any direction as long as he is looking through a special pane

Brute Forsman
Brute Forsman
Level 59
Enumeration
Ability
Infinite Patience

When faced with a locked door, can summon a ring with every possible key and try them one-by-one

Ness T. Dollov
Ness T. Dollov
Level 66
Recursion
Ability
Unlimited Sentences

Can trap an enemy in a never-ending series of magical dolls

El Alquimista
El Alquimista
Level 31
Hash Function
Ability
Prime Essence

Can distill any complex object down into a unique drop of potion

Prof. Recursi
Prof. Recursi
Level 31
Backtracking
Ability
Temporal Rewind

Upon hitting a conflict, he can instantly rewind time to a point before the conflict

Señor Liston
Señor Liston
Level 91
Linked List
Ability
Join the Line

Instantly adds a new dancer to the very end of the conga line by only interacting with the last person

Solutions For Everyone

Find multiple solutions with detailed explanations for every problem, making sure no concept goes misunderstood.

Problem Page