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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 90
Matrix & 2D Arrays
Ability
Positional Pinpoint

Given a specific coordinate, he can identify all present structures

Priory Qu
Priory Qu
Level 24
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 88
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 64
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 66
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 74
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 20
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 38
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 69
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 20
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 100
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 24
Recursion
Ability
Unlimited Sentences

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

El Alquimista
El Alquimista
Level 55
Hash Function
Ability
Prime Essence

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

Prof. Recursi
Prof. Recursi
Level 20
Backtracking
Ability
Temporal Rewind

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

Señor Liston
Señor Liston
Level 95
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 24
Matrix & 2D Arrays
Ability
Positional Pinpoint

Given a specific coordinate, he can identify all present structures

Priory Qu
Priory Qu
Level 2
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 68
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 26
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 65
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 3
Bit Manipulation
Ability
Property Flip

Can touch an object and instantly reverse its most important property

Rooty Rich
Rooty Rich
Level 76
Binary Trees
Ability
Split Decision

Knows the answer to any yes/no question

Ty P. Locke
Ty P. Locke
Level 74
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 31
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 100
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 95
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 95
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 81
Recursion
Ability
Unlimited Sentences

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

El Alquimista
El Alquimista
Level 55
Hash Function
Ability
Prime Essence

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

Prof. Recursi
Prof. Recursi
Level 85
Backtracking
Ability
Temporal Rewind

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

Señor Liston
Señor Liston
Level 81
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 3
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 20
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 81
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 96
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 61
Binary Trees
Ability
Split Decision

Knows the answer to any yes/no question

Ty P. Locke
Ty P. Locke
Level 55
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 59
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 3
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 38
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 64
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 52
Recursion
Ability
Unlimited Sentences

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

El Alquimista
El Alquimista
Level 96
Hash Function
Ability
Prime Essence

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

Prof. Recursi
Prof. Recursi
Level 38
Backtracking
Ability
Temporal Rewind

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

Señor Liston
Señor Liston
Level 20
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 24
Matrix & 2D Arrays
Ability
Positional Pinpoint

Given a specific coordinate, he can identify all present structures

Priory Qu
Priory Qu
Level 95
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 20
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 69
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 70
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 64
Bit Manipulation
Ability
Property Flip

Can touch an object and instantly reverse its most important property

Rooty Rich
Rooty Rich
Level 90
Binary Trees
Ability
Split Decision

Knows the answer to any yes/no question

Ty P. Locke
Ty P. Locke
Level 64
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 64
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 90
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 48
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 65
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 69
Recursion
Ability
Unlimited Sentences

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

El Alquimista
El Alquimista
Level 63
Hash Function
Ability
Prime Essence

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

Prof. Recursi
Prof. Recursi
Level 76
Backtracking
Ability
Temporal Rewind

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

Señor Liston
Señor Liston
Level 85
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.

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