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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 46
Matrix & 2D Arrays
Ability
Positional Pinpoint

Given a specific coordinate, he can identify all present structures

Priory Qu
Priory Qu
Level 71
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 79
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 73
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 55
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 39
Bit Manipulation
Ability
Property Flip

Can touch an object and instantly reverse its most important property

Rooty Rich
Rooty Rich
Level 14
Binary Trees
Ability
Split Decision

Knows the answer to any yes/no question

Ty P. Locke
Ty P. Locke
Level 14
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 26
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 5
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 9
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 33
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 59
Recursion
Ability
Unlimited Sentences

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

El Alquimista
El Alquimista
Level 60
Hash Function
Ability
Prime Essence

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

Prof. Recursi
Prof. Recursi
Level 50
Backtracking
Ability
Temporal Rewind

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

Señor Liston
Señor Liston
Level 73
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 20
Matrix & 2D Arrays
Ability
Positional Pinpoint

Given a specific coordinate, he can identify all present structures

Priory Qu
Priory Qu
Level 93
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 39
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 46
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 73
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 52
Bit Manipulation
Ability
Property Flip

Can touch an object and instantly reverse its most important property

Rooty Rich
Rooty Rich
Level 40
Binary Trees
Ability
Split Decision

Knows the answer to any yes/no question

Ty P. Locke
Ty P. Locke
Level 15
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 73
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 5
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 9
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 36
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 13
Recursion
Ability
Unlimited Sentences

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

El Alquimista
El Alquimista
Level 52
Hash Function
Ability
Prime Essence

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

Prof. Recursi
Prof. Recursi
Level 55
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

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 52
Matrix & 2D Arrays
Ability
Positional Pinpoint

Given a specific coordinate, he can identify all present structures

Priory Qu
Priory Qu
Level 33
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 40
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 5
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 19
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 39
Bit Manipulation
Ability
Property Flip

Can touch an object and instantly reverse its most important property

Rooty Rich
Rooty Rich
Level 40
Binary Trees
Ability
Split Decision

Knows the answer to any yes/no question

Ty P. Locke
Ty P. Locke
Level 89
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 36
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 93
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 85
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 73
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 93
Recursion
Ability
Unlimited Sentences

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

El Alquimista
El Alquimista
Level 46
Hash Function
Ability
Prime Essence

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

Prof. Recursi
Prof. Recursi
Level 39
Backtracking
Ability
Temporal Rewind

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

Señor Liston
Señor Liston
Level 36
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 26
Matrix & 2D Arrays
Ability
Positional Pinpoint

Given a specific coordinate, he can identify all present structures

Priory Qu
Priory Qu
Level 50
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 40
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 23
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 23
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 59
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 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 33
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 39
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 50
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 55
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 46
Recursion
Ability
Unlimited Sentences

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

El Alquimista
El Alquimista
Level 23
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 89
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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