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Grokking the Coding Interview: Patterns for Coding Questions

Master the coding interview by learning coding patterns. Act smartly, and follow the coding patterns.
Level:
Intermediate
Study Time:
61h
Lessons:
325
Playgrounds :
352
211,991 (Students)
Course Overview
Coding interviews are getting harder every day. A few years back, brushing up on key data structures and going through 50-75 coding interview questions was more than enough prep for an interview. Today, everyone has access to massive sets of coding problems, and they've gotten more difficult to account for that. The process has gotten more competitive. When our team sat together to brainstorm on ideas to make the interview process easier for candidates, we realized quickly that one skill helped us the most when we were preparing for coding interviews: "the ability to map a new problem to an already known problem." To help candidates with that, we've come up with a list of 20 patterns for coding questions, based on similarities in the techniques needed to solve them. As a result, once you're familiar with a pattern, you'll be able to solve dozens of problems with it. The techniques taught in this course have helped developers land jobs in top companies including Google, Facebook, Amazon, and Microsoft.
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Certification Included
Certification on completing the course.
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Lifetime Access
Lifetime access including all future updates.
Course Content
• 24 Chapters • 325 Lessons
Who should take this course?
Course Overview
Why warmup?
Contains Duplicate (easy)
Solution: Contains Duplicate
Pangram (easy)
Solution: Pangram
Sqrt (easy)
Solution: Sqrt
Reverse Vowels (easy)
Solution: Reverse Vowels
Valid Palindrome (easy)
Solution: Valid Palindrome
Valid Anagram (easy)
Solution: Valid Anagram
Shortest Word Distance (easy)
Solution: Shortest Word Distance
Number of Good Pairs (easy)
Solution: Number of Good Pairs
Introduction to Two Pointers Pattern
Pair with Target Sum (easy)
Solution: Pair with Target Sum
Remove Duplicates (easy)
Solution: Remove Duplicates
Squaring a Sorted Array (easy)
Solution: Squaring a Sorted Array
Triplet Sum to Zero (medium)
Solution: Triplet Sum to Zero
Triplet Sum Close to Target (medium)
Solution: Triplet Sum Close to Target
Triplets with Smaller Sum (medium)
Solution: Triplets with Smaller Sum
Subarrays with Product Less than a Target (medium)
Solution: Subarrays with Product Less than a Target
Dutch National Flag Problem (medium)
Solution: Dutch National Flag Problem
Problem Challenge 1: Quadruple Sum to Target (medium)
Solution: Problem Challenge 1: Quadruple Sum to Target
Problem Challenge 2: Comparing Strings containing Backspaces (medium)
Solution: Problem Challenge 2: Comparing Strings containing Backspaces
Problem Challenge 3: Minimum Window Sort (medium)
Solution: Problem Challenge 3: Minimum Window Sort
Introduction to Island Pattern
Number of Islands (easy)
Solution: Number of Islands
Biggest Island (easy)
Solution: Biggest Island
Flood Fill (easy)
Solution: Flood Fill
Number of Closed Islands (easy)
Solution: Number of Closed Islands
Problem Challenge 1
Solution: Problem Challenge 1
Problem Challenge 2
Solution: Problem Challenge 2
Problem Challenge 3
Solution: Problem Challenge 3
Introduction to Fast & Slow Pointers Pattern
LinkedList Cycle (easy)
Solution: LinkedList Cycle
Start of LinkedList Cycle (medium)
Solution: Start of LinkedList Cycle
Happy Number (medium)
Solution: Happy Number
Middle of the LinkedList (easy)
Solution: Middle of the LinkedList
Problem Challenge 1: Palindrome LinkedList (medium)
Solution: Problem Challenge 1: Palindrome LinkedList
Problem Challenge 2: Rearrange a LinkedList (medium)
Solution: Problem Challenge 2: Rearrange a LinkedList
Problem Challenge 3: Cycle in a Circular Array (hard)
Solution: Problem Challenge 3: Cycle in a Circular Array
Introduction to Sliding Window Pattern
Maximum Sum Subarray of Size K (easy)
Solution: Maximum Sum Subarray of Size K
Smallest Subarray With a Greater Sum (easy)
Solution: Smallest Subarray With a Greater Sum
Longest Substring with K Distinct Characters (medium)
Solution: Longest Substring with K Distinct Characters
Fruits into Baskets (medium)
Solution: Fruits into Baskets
Longest Substring with Same Letters after Replacement (hard)
Solution: Longest Substring with Same Letters after Replacement
Longest Subarray with Ones after Replacement (hard)
Solution: Longest Subarray with Ones after Replacement
Problem Challenge 1: Permutation in a String (hard)
Solution: Problem Challenge 1: Permutation in a String
Problem Challenge 2: String Anagrams (hard
Solution: Problem Challenge 2: String Anagrams
Problem Challenge 3: Smallest Window containing Substring (hard)
Solution: Problem Challenge 3: Smallest Window containing Substring
Problem Challenge 4: Words Concatenation (hard)
Solution: Problem Challenge 4: Words Concatenation
Introduction to Merge Intervals Pattern
Merge Intervals (medium)
Solution: Merge Intervals
Insert Interval (medium)
Solution: Insert Interval
Intervals Intersection (medium)
Solution: Intervals Intersection
Conflicting Appointments (medium)
Solution: Conflicting Appointments
Problem Challenge 1: Minimum Meeting Rooms (hard)
Solution: Problem Challenge 1: Minimum Meeting Rooms
Problem Challenge 2: Maximum CPU Load (hard)
Solution: Problem Challenge 2: Maximum CPU Load
Problem Challenge 3: Employee Free Time (hard)
Solution: Problem Challenge 3: Employee Free Time
Introduction to Cyclic Sort Pattern
Cyclic Sort (easy)
Solution: Cyclic Sort
Find the Missing Number (easy)
Solution: Find the Missing Number
Find all Missing Numbers (easy)
Solution: Find all Missing Numbers
Find the Duplicate Number (easy)
Solution: Find the Duplicate Number
Find all Duplicate Numbers (easy)
Solution: Find all Duplicate Numbers
Problem Challenge 1: Find the Corrupt Pair (easy)
Solution: Problem Challenge 1: Find the Corrupt Pair
Problem Challenge 2: Find the Smallest Missing Positive Number (medium)
Solution: Problem Challenge 2: Find the Smallest Missing Positive Number
Problem Challenge 3: Find the First K Missing Positive Numbers (hard)
Solution: Problem Challenge 3: Find the First K Missing Positive Numbers
Introduction to In-place Reversal of a Linked List Pattern
Reverse a LinkedList (easy)
Solution: Reverse a LinkedList
Reverse a Sub-list (medium)
Solution: Reverse a Sub-list
Reverse every K-element Sub-list (medium)
Solution: Reverse every K-element Sub-list
Problem Challenge 2: Rotate a LinkedList (medium)
Solution: Problem Challenge 2: Rotate a LinkedList
Problem Challenge 1: Reverse alternating K-element Sub-list (medium)
Solution: Problem Challenge 1: Reverse alternating K-element Sub-list
Introduction to Tree Breadth First Search Pattern
Binary Tree Level Order Traversal (easy)
Solution: Binary Tree Level Order Traversal
Reverse Level Order Traversal (easy)
Solution: Reverse Level Order Traversal
Zigzag Traversal (medium)
Solution: Zigzag Traversal
Level Averages in a Binary Tree (easy)
Solution: Level Averages in a Binary Tree
Minimum Depth of a Binary Tree (easy)
Solution: Minimum Depth of a Binary Tree
Level Order Successor (easy)
Solution: Level Order Successor
Connect Level Order Siblings (medium)
Solution: Connect Level Order Siblings
Problem Challenge 1: Connect All Level Order Siblings (medium)
Solution: Problem Challenge 1: Connect All Level Order Siblings
Problem Challenge 2: Right View of a Binary Tree (easy)
Solution: Problem Challenge 2: Right View of a Binary Tree
Introduction to Tree Depth First Search Pattern
Binary Tree Path Sum (easy)
Solution: Binary Tree Path Sum
All Paths for a Sum (medium)
Solution: All Paths for a Sum
Sum of Path Numbers (medium)
Solution: Sum of Path Numbers
Path With Given Sequence (medium)
Solution: Path With Given Sequence
Count Paths for a Sum (medium)
Solution: Count Paths for a Sum
Problem Challenge 1: Tree Diameter (medium)
Solution: Problem Challenge 1: Tree Diameter
Problem Challenge 2: Path with Maximum Sum (hard)
Solution: Problem Challenge 2: Path with Maximum Sum
Introduction to Two Heaps Pattern
Find the Median of a Number Stream (medium)
Solution: Find the Median of a Number Stream
Sliding Window Median (hard)
Solution: Sliding Window Median
Maximize Capital (hard)
Solution: Maximize Capital
Problem Challenge 1: Next Interval (hard)
Solution: Problem Challenge 1: Next Interval
Introduction to Subsets Pattern
Subsets (easy)
Solution: Subsets
Subsets With Duplicates (easy)
Solution: Subsets With Duplicates
Permutations (medium)
Solution: Permutations
String Permutations by changing case (medium)
Solution: String Permutations by changing case
Balanced Parentheses (hard)
Solution: Balanced Parentheses
Unique Generalized Abbreviations (hard)
Solution: Unique Generalized Abbreviations
Problem Challenge 1: Evaluate Expression (hard)
Solution: Problem Challenge 1: Evaluate Expression
Problem Challenge 2: Structurally Unique Binary Search Trees (hard)
Solution: Problem Challenge 2: Structurally Unique Binary Search Trees
Problem Challenge 3: Count of Structurally Unique Binary Search Trees (hard)
Solution: Problem Challenge 3: Count of Structurally Unique Binary Search Trees
Introduction to Modified Binary Search Pattern
Order-agnostic Binary Search (easy)
Solution: Order-agnostic Binary Search
Ceiling of a Number (medium)
Solution: Ceiling of a Number
Next Letter (medium)
Solution: Next Letter
Number Range (medium)
Solution: Number Range
Search in a Sorted Infinite Array (medium)
Solution: Search in a Sorted Infinite Array
Minimum Difference Element (medium)
Solution: Minimum Difference Element
Bitonic Array Maximum (easy)
Solution: Bitonic Array Maximum
Problem Challenge 1: Search Bitonic Array (medium)
Solution: Problem Challenge 1: Search Bitonic Array
Problem Challenge 2: Search in Rotated Array (medium)
Solution: Problem Challenge 2: Search in Rotated Array
Problem Challenge 3: Rotation Count (medium)
Solution: Problem Challenge 3: Rotation Count
Introduction to Bitwise XOR Pattern
Single Number (easy)
Solution: Single Number
Two Single Numbers (medium)
Solution: Two Single Numbers
Complement of Base 10 Number (medium)
Solution: Complement of Base 10 Number
Problem Challenge 1: Flip and Invert an Image (hard)
Solution: Problem Challenge 1: Flip and Invert an Image
Introduction to Top 'K' Elements Pattern
Top 'K' Numbers (easy)
Solution: Top 'K' Numbers
Kth Smallest Number (easy)
Solution: Kth Smallest Number
'K' Closest Points to the Origin (easy)
Solution: 'K' Closest Points to the Origin
Connect Ropes (easy)
Solution: Connect Ropes
Top 'K' Frequent Numbers (medium)
Solution: Top 'K' Frequent Numbers
Frequency Sort (medium)
Solution: Frequency Sort
Kth Largest Number in a Stream (medium)
Solution: Kth Largest Number in a Stream
'K' Closest Numbers (medium)
Solution: 'K' Closest Numbers
Maximum Distinct Elements (medium)
Solution: Maximum Distinct Elements
Sum of Elements (medium)
Solution: Sum of Elements
Rearrange String (hard)
Solution: Rearrange String
Problem Challenge 1: Rearrange String K Distance Apart (hard)
Solution: Problem Challenge 1: Rearrange String K Distance Apart
Problem Challenge 2: Scheduling Tasks (hard)
Solution: Problem Challenge 2: Scheduling Tasks
Problem Challenge 3: Frequency Stack (hard)
Solution: Problem Challenge 3: Frequency Stack
Introduction to K-way Merge Pattern
Merge K Sorted Lists (medium)
Solution: Merge K Sorted Lists
Kth Smallest Number in M Sorted Lists (Medium)
Solution: Kth Smallest Number in M Sorted Lists
Kth Smallest Number in a Sorted Matrix (Hard)
Solution: Kth Smallest Number in a Sorted Matrix
Smallest Number Range (Hard)
Solution: Smallest Number Range
Problem Challenge 1: K Pairs with Largest Sums (Hard)
Solution: Problem Challenge 1: K Pairs with Largest Sum
Introduction to Backtracking Pattern
Combination Sum (medium)
Solution: Combination Sum
Word Search (medium)
Solution: Word Search
Sudoku Solver (hard)
Solution: Sudoku Solver
Factor Combinations (medium)
Solution: Factor Combinations
Split a String Into the Max Number of Unique Substrings (medium)
Solution: Split a String Into the Max Number of Unique Substrings
Introduction to 0/1 Knapsack Pattern
0/1 Knapsack (medium)
Solution: 0/1 Knapsack
Equal Subset Sum Partition (medium)
Solution: Equal Subset Sum Partition
Subset Sum (medium)
Solution: Subset Sum
Minimum Subset Sum Difference (hard)
Solution: Minimum Subset Sum Difference
Problem Challenge 1: Count of Subset Sum (hard)
Solution: Problem Challenge 1: Count of Subset Sum
Problem Challenge 2: Target Sum (hard)
Solution: Problem Challenge 2: Target Sum
Introduction to Topological Sort Pattern
Topological Sort (medium)
Solution: Topological Sort
Tasks Scheduling (medium)
Solution: Tasks Scheduling
Tasks Scheduling Order (medium)
Solution: Tasks Scheduling Order
All Tasks Scheduling Orders (hard)
Solution: All Tasks Scheduling Orders
Alien Dictionary (hard)
Solution: Alien Dictionary
Problem Challenge 1: Reconstructing a Sequence (hard)
Solution: Problem Challenge 1: Reconstructing a Sequence
Problem Challenge 2: Minimum Height Trees (hard)
Solution: Problem Challenge 2: Minimum Height Trees
Introduction to Multi-threaded Pattern
Same Tree (medium)
Solution: Same Tree
Invert Binary Tree (medium)
Solution: Invert Binary Tree
Binary Search Tree Iterator (medium)
Solution: Binary Search Tree Iterator
Kth Smallest Number (hard)
Solution: Kth Smallest Number
Introduction
Valid Perfect Square (easy)
Best Time to Buy and Sell Stock (easy)
Daily Temperatures (medium)
Group Anagrams (medium)
Decode String (medium)
Valid Sudoku (medium)
Longest Valid Parentheses (medium)
Where to Go from Here
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