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137 Questions 🚀 😤

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All of our questions are hand picked. We focus on working through problems and algorithms which help develop intuition and a deep understanding of problems. With a focus on approach and pattern recognition you'll be well prepared to solve any question thrown your way!

Arrays

(7)

Best Time to Buy and Sell Stock
#arrays #leetcode
K Closest Points to Origin
#arrays #leetcode #ctci
Two Sum
#arrays #leetcode
Max Consecutive Ones
#arrays leetcode
Find Numbers with Even Numbers of Digits
#arrays leetcode
Squares of Sorted Arrays
#arrays leetcode
Representation and Dot Product of Sparse Vectors
#arrays #hashtables

Binary Search Trees

(10)

Find Predecessor in Binary Search Tree
#recursion #binarysearchtrees #trees #leetcode
Find Min and Max Elements in Binary Search Tree
#recursion #binarysearchtrees trees leetcode
Find Second Largest in Binary Search Tree
#recursion #binarysearchtrees trees leetcode
Find Successor in Binary Search Tree
#recursion #binarysearchtrees trees leetcode
Is Valid Binary Search Tree
#recursion #binarysearchtrees trees leetcode
Sorted Array To Binary Search Tree
#recursion #binarysearchtrees trees leetcode
Lowest Common Ancestor in BST
#recursion #trees #binarysearchtrees #leetcode #ctci
Delete Node from Binary Search Tree
#binarysearchtrees leetcode ctci trees
Insert Node into Binary Search Tree
#binarysearchtrees leetcode ctci trees
How to bullshit interviews
#recursion #binarysearchtrees trees leetcode

Binary Trees

(10)

BFS Tree Traversal
#trees #binarytrees
DFS Tree Traversal
#trees #binarytrees
Construct Tree from Inorder and Preorder Traversal
#recursion #binarytree #trees
Construct Tree from Inorder and Postorder Traversal
#recursion #binarytree #trees
Inorder Traversal
#recursion #binarytree #trees #leetcode #ctci
Postorder Traversal
#recursion #binarytree #trees #leetcode #ctci
Preorder Traversal
#recursion #binarytree #trees #leetcode #ctci
Lowest Common Ancestor in Binary Tree
#recursion #trees #binarysearchtrees #leetcode #ctci
Invert Binary Tree
#recursion #binarytree #trees #leetcode
Find Leaves of a Binary Tree
#recursion #binarytree #trees #leetcode #ctci

Dynamic Programming

(11)

Unique Binary Search Trees
#dynamicprogramming #leetcode #ctci
Coin Change
#recursion #dynamicprogramming #leetcode #ctci
Rob House
#recursion #dynamicprogramming #leetcode
Longest Palindromic Substring
#strings #dynamicprogramming #leetcode #ctci
Maximum Product Subarray
#dynamicprogramming #leetcode
Max Profit Job Schedule
#recursion #dynamicprogramming #leetcode
Decode Ways
#recursion #dynamicprogramming #leetcode
Longest Increasing Path in a Matrix
#recursion #dynamicprogramming #leetcode #ctci
Longest Increasing Subsequence
#recursion #dynamicprogramming #leetcode
Encode String with Shortest Length
#recursion #dynamicprogramming #leetcode #ctci
Minimum Knight Moves
#recursion #dynamicprogramming #leetcode #ctci

Graphs

(12)

Graph Basics
#graphs
Graph BFS
#graphs
Graph Algorithms
#graphs
Graph Representations
#graphs
Graph DFS
#graphs
Topological Sort
#graphs
Find Course Schedule
#graphs #leetcode #ctci
Find Cycle in Undirected Graph
#graphs #leetcode #ctci
Find Cycle in Directed Graph
#graphs #leetcode #ctci
Is Course Schedule Possible?
#graphs #leetcode #ctci
Dijkstra's Algorithm
#graphs
Number of Provinces
#graphs #leetcode

Hash Tables

(8)

Design a HashMap
#hashtables #leetcode
Are String Isomorphic?
#hashtables #leetcode #strings
Single Number
#hashtables #leetcode
Find Intersection Between Two Arrays
#hashtables #leetcode
Find Intersection Between Two Arrays 2
#hashtables #leetcode
Single Number
#hashtables #leetcode
Find Duplicate File in System
#hashtables #leetcode
Design a Hash Set
#hashtables #leetcode

Linked Lists

(13)

Reverse Linked Lists
#linked-lists #math #ctci #leetcode
Loop Detection
#linked-lists #ctci
Add Two Numbers
#linked-lists #math #ctci #leetcode
Delete Node from a Singly Linked List
#linked-lists
Delete Kth to Last Node
#linked-lists #ctci
Delete Middle Node
#linked-lists #ctci
Linked Lists Partition
#linked-lists #ctci
Remove Duplicates
#linked-lists #ctci
Remove Duplicates from Sorted List
#linked-lists #ctci
Return Kth to Last Node
#linked-lists #ctci
Runners Technique
#linked-lists #ctci
Intersection
#linked-lists #ctci
Palindrome
#linked-lists #ctci

Object Oriented Design

(9)

Design a Snake Game
#object-oriented-design #leetcode #ctci
Design Browser History
#object-oriented-design #stacksqueues #leetcode
Design an Underground System
#object-oriented-design #hashtables #leetcode
Design a Leaderboard
#object-oriented-design #stacksqueues #leetcode
Design a Logger Rate Limiter
#object-oriented-design #leetcode #ctci
Design a LRU Cache
#object-oriented-design #leetcode #ctci
Design a Max Stack
#object-oriented-design #leetcode #ctci
Design Tic Tac Toe
#object-oriented-design #leetcode #ctci
Design a File System
#object-oriented-design #leetcode

Recursion

(12)

Sorted Array to Binary Search Tree
#recursion #leetcode #ctci
Sum Array Recursively
#recursion #array
Subtree of Another Tree
#recursion #trees #leetcode #ctci
Generate Permutations
#recursion #leetcode #ctci epi
Generate All Subsets of Size K
#recursion #leetcode #ctci
Generate the Power Set
#recursion #leetcode #ctci
Recursive Techniques
#recursion
Calculating the Nth Fibonacci number
#recursion
Climbing Stairs
#recursion
Reverse String
#recursion #strings
Generate Parentheses
#recursion #leetcode #ctci epi
Generate Permutations with Duplicates
#recursion #leetcode #ctci epi

Sorting and Searching

(19)

Merge K Sorted Lists
#sorting-searching #arrays #leetcode #ctci
Merge Sort
#sorting-searching #leetcode #ctci
Search in Rotated Array
#sorting-searching #leetcode #ctci
Find Duplicates
#sorting-searching #leetcode #ctci
Group Anagrams
#sorting-searching #arrays #leetcode
Merge Sorted Arrays
#sorting-searching #arrays #leetcode
Magic Index
#recursion #sorting-searching #ctci
Binary Search
#sorting-searching #leetcode #ctci
Bubble Sort
#sorting-searching #leetcode #ctci
Quick Sort
#sorting-searching #leetcode #ctci
Missing Int
#sorting-searching #leetcode #ctci
Peaks and Valleys
#sorting-searching #leetcode #ctci
Sorted Merge
#sorting-searching #leetcode #ctci
Sorted Search, No Size
#sorting-searching #leetcode #ctci
Sort Big File
#sorting-searching #leetcode #ctci
Sparse Search
#sorting-searching #leetcode #ctci
Sorted Matrix Search
#sorting-searching #leetcode #ctci
Rank From Stream
#sorting-searching #leetcode #ctci
Random Pick with Weights
#sorting-searching #leetcode #ctci

Stacks and Queues

(15)

Find Median From Data Stream
#stacksqueues #leetcode
Animal Shelter
#stacksqueues #ctci
Stack of Plates
#stacksqueues #ctci
Meeting Rooms
#arrays #leetcode #ctci #greedy
Implement A Stack Using Queues
#stacksqueues #leetcode #ctci
Meeting Rooms 2
#stacksqueues #greedy #leetcode #ctci
Min Stack
#stacksqueues #leetcode #ctci
Implement A Stack Using Queues
#stacksqueues #leetcode #ctci
Meeting Rooms
#stacksqueues #leetcode #ctci #greedy
Basic Calculator
#stacksqueues #leetcode #ctci
Bracket Validator
#stacksqueues #leetcode
Sort Stack
#stacksqueues #leetcode #ctci
Three in One
#stacksqueues #leetcode #ctci
Sliding Window Maximum
#stacksqueues #leetcode #ctci
Employee Free Time
#stacksqueues #leetcode #ctci

Strings

(10)

Check Permutation
#strings #ctci
Letter Combination of a Phone Number
#strings #leetcode recursion
Edit Distance
#strings #ctci leetcode
Palindrome Permutation
#strings #leetcode ctci
Permutation in String
#strings #leetcode
Is Unique
#strings #ctci
String Compression
#strings #ctci
String Rotation
#strings #ctci
URLify
#strings #ctci
Longest Common Prefix
#strings #leetcode

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