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Grokking the Coding Interview Patterns in C++

The ultimate guide to coding interviews in C++, Grokking the Coding Interview Patterns in C++ teaches proven strategies developed by FAANG engineers to get interview-ready in just a few hours.
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With thousands of potential questions to account for, preparing for the coding interview can feel like an impossible challenge. Yet with a strategic approach, coding interview prep doesn’t have to take more than a few weeks. Stop drilling endless sets of practice problems, and prepare more efficiently by learning coding interview patterns. This course teaches you the underlying patterns behind common coding interview questions. By learning these essential patterns, you will be able to unpack and answer any problem the right way — just by assessing the problem statement. This approach was created by FAANG hiring managers to help you prepare for the typical rounds of interviews at major tech companies like Apple, Google, Meta, Microsoft, and Amazon. Before long, you will have the skills you need to unlock even the most challenging questions, grok the coding interview, and level up your career with confidence. This course is also available in JavaScript, Java, Python, C# and Go — with more coming soon!
With thousands of potential questions to account for, preparing for the coding interview can feel like an impossible challenge. ...Show More

WHAT YOU'LL LEARN

Understand the essential patterns behind common coding interview questions — without having to drill endless problem sets
Identify the underlying pattern of each interview question by assessing the problem statement (and learn the tricks required to solve it)
Practice your skills in a hands-on, setup-free coding environment
Learn to efficiently evaluate the tradeoffs between time and space complexity in different solutions
Develop a flexible conceptual framework for solving any question, by connecting problem characteristics, solution techniques, and coding design patterns
Understand the essential patterns behind common coding interview questions — without having to drill endless problem sets

Show more

TAKEAWAY SKILLS

C++

Programming Language

Prepare for Interview

Coding Interview Patterns

Data Structures

Content

749 Lessons391 Quizzes390 Challenges

1.

Getting Started

2 Lessons

Learn how to use coding patterns for effective interview preparation and problem-solving.
Course Overview
Who Should Take This Course

2.

Two Pointers

24 Lessons

Discover the logic behind the two pointers technique for efficiently solving array and string problems.
Introduction to Two Pointers
Valid Palindrome
Solution: Valid Palindrome
3Sum
Solution: 3Sum
Remove Nth Node from End of List
Solution: Remove Nth Node from End of List
Sort Colors
Solution: Sort Colors
Reverse Words in a String
Solution: Reverse Words in a String
Valid Word Abbreviation
Solution: Valid Word Abbreviation
Strobogrammatic Number
Solution: Strobogrammatic Number
Minimum Number of Moves to Make Palindrome
Solution: Minimum Number of Moves to Make Palindrome
Next Palindrome Using Same Digits
Solution: Next Palindrome Using Same Digits
Lowest Common Ancestor of a Binary Tree III
Solution: Lowest Common Ancestor of a Binary Tree III
Count Pairs Whose Sum is Less than Target
Solution: Count Pairs Whose Sum is Less than Target
Valid Palindrome II

4.

Sliding Window

27 Lessons

Find out about the sliding window technique for solving subarray and substring problems efficiently.
Introduction to Sliding Window
Repeated DNA Sequences
Solution: Repeated DNA Sequences
Sliding Window Maximum
Solution: Sliding Window Maximum
Minimum Window Subsequence
Solution: Minimum Window Subsequence
Longest Repeating Character Replacement
Solution: Longest Repeating Character Replacement
Minimum Window Substring
Solution: Minimum Window Substring
Longest Substring without Repeating Characters
Solution: Longest Substring without Repeating Characters
Minimum Size Subarray Sum
Solution: Minimum Size Subarray Sum
Maximum Average Subarray I
Solution: Maximum Average Subarray I
Diet Plan Performance
Solution: Diet Plan Performance
Fruit Into Baskets
Solution: Fruit Into Baskets
Contains Duplicate II
Solution: Contains Duplicate II
Frequency of the Most Frequent Element
Solution: Frequency of the Most Frequent Element
Subarrays with K Different Integers
Solution: Subarrays with K Different Integers

6.

In-Place Manipulation of a Linked List

24 Lessons

Simplify complex topics of in-place linked list manipulations including reversal, reordering, and swapping nodes efficiently.
Introduction to In-Place Manipulation of a Linked List
Reverse Linked List
Solution: Reverse Linked List
Reverse Nodes in k-Group
Solution: Reverse Nodes in k-Group
Reverse Linked List II
Solution: Reverse Linked List II
Reorder List
Solution: Reorder List
Swapping Nodes in a Linked List
Solution: Swapping Nodes in a Linked List
Reverse Nodes in Even Length Groups
Solution: Reverse Nodes in Even Length Groups
Remove Duplicates from Sorted List
Solution: Remove Duplicates from Sorted List
Remove Linked List Elements
Solution: Remove Linked List Elements
Split Linked List in Parts
Solution: Split Linked List in Parts
Delete N Nodes After M Nodes of a Linked List
Solution: Delete N Nodes After M Nodes of a Linked List
Insert into a Sorted Circular Linked List
Solution: Insert into a Sorted Circular Linked List
Swap Nodes in Pairs

9.

Top K Elements

29 Lessons

Get started with identifying Top K elements efficiently using heaps and frequency.
Introduction to Top K Elements
Kth Largest Element in a Stream
Solution: Kth Largest Element in a Stream
Reorganize String
Solution: Reorganize String
K Closest Points to Origin
Solution: K Closest Points to Origin
Top K Frequent Elements
Solution: Top K Frequent Elements
Kth Largest Element in an Array
Solution: Kth Largest Element in an Array
Third Maximum Number
Solution: Third Maximum Number
Find Subsequence of Length K with the Largest Sum
Solution: Find Subsequence of Length K with the Largest Sum
Minimum Cost to Hire K Workers
Solution: Minimum Cost to Hire K Workers
Maximal Score After Applying K Operations
Solution: Maximal Score After Applying K Operations
Find the Kth Largest Integer in the Array
Solution: Find the Kth Largest Integer in the Array
Maximum Performance of a Team
Solution: Maximum Performance of a Team
Smallest Range Covering Elements from K Lists
Solution: Smallest Range Covering Elements from K Lists
K Maximum Sum Combinations From Two Arrays
Solution: K Maximum Sum Combinations From Two Arrays
K Empty Slots
Solution: K Empty Slots

10.

Modified Binary Search

28 Lessons

Master the steps to efficiently search through sorted and rotated arrays using modified binary search techniques.
Introduction to Modified Binary Search
Binary Search
Solution: Binary Search
Search in Rotated Sorted Array
Solution: Search in Rotated Sorted Array
First Bad Version
Solution: First Bad Version
Random Pick with Weight
Solution: Random Pick with Weight
Find K Closest Elements
Solution: Find K Closest Elements
Single Element in a Sorted Array
Solution: Single Element in a Sorted Array
Maximum Value at a Given Index in a Bounded Array
Solution: Maximum Value at a Given Index in a Bounded Array
The K Weakest Rows in a Matrix
Solution: The K Weakest Rows in a Matrix
Split Array Largest Sum
Solution: Split Array Largest Sum
Find Minimum in Rotated Sorted Array II
Solution: Find Minimum in Rotated Sorted Array II
Maximum Running Time of N Computers
Solution: Maximum Running Time of N Computers
Minimize Max Distance to Gas Station
Solution: Minimize Max Distance to Gas Station
Divide Chocolate
Solution: Divide Chocolate
Search in Rotated Sorted Array II

12.

Greedy Techniques

31 Lessons

Solve problems in optimization with greedy algorithms, ensuring efficient, practical solutions.
Introduction to Greedy Techniques
Jump Game
Solution: Jump Game
Boats to Save People
Solution: Boats to Save People
Gas Station
Solution: Gas Station
Two City Scheduling
Solution: Two City Scheduling
Minimum Number of Refueling Stops
Solution: Minimum Number of Refueling Stops
Largest Palindromic Number
Solution: Largest Palindromic Number
Assign Cookies
Solution: Assign Cookies
Rearranging Fruits
Solution: Rearranging Fruits
Number of Steps to Reduce a Binary Number to One
Solution: Number of Steps to Reduce a Binary Number to One
Maximum Swap
Solution: Maximum Swap
Can Place Flowers
Solution: Can Place Flowers
Largest Odd Number in String
Solution: Largest Odd Number in String
Candy
Solution: Candy
Minimum Replacements to Sort the Array
Solution: Minimum Replacements to Sort the Array
Jump Game II
Best Time to Buy and Sell Stock

14.

Dynamic Programming

36 Lessons

Master the steps to solve complex optimization problems using dynamic programming techniques in C++.
Introduction to Dynamic Programming
0/1 Knapsack
Solution: 0/1 Knapsack
Coin Change
Solution: Coin Change
N-th Tribonacci Number
Solution: N-th Tribonacci Number
Partition Equal Subset Sum
Solution: Partition Equal Subset Sum
Counting Bits
Solution: Counting Bits
01 Matrix
Solution: 01 Matrix
House Robber II
Solution: House Robber II
Maximum Product Subarray
Solution: Maximum Product Subarray
Combination Sum
Solution: Combination Sum
Word Break
Solution: Word Break
Palindromic Substrings
Solution: Palindromic Substrings
Longest Common Subsequence
Solution: Longest Common Subsequence
Word Break II
Solution: Word Break II
Decode Ways
Solution: Decode Ways
Count the Number of Good Subsequences
Solution: Count the Number of Good Subsequences
Binary Tree Cameras
Solution: Binary Tree Cameras
Number of Ways to Form Target String Given a Dictionary
Solution: Number of Ways to Form Target String Given a Dictionary
Climbing Stairs

17.

Sort and Search

31 Lessons

Solve problems by organizing data through sorting and applying binary search, two-pointer, and sliding window for efficient solutions.
Introduction to Sort and Search
Find the Distance Value Between Two Arrays
Solution: Find the Distance Value Between Two Arrays
Longest Subsequence With Limited Sum
Solution: Longest Subsequence With Limited Sum
Find Target Indices After Sorting Array
Solution: Find Target Indices After Sorting Array
Count Pairs in Two Arrays
Solution: Count Pairs in Two Arrays
Valid Triangle Number
Solution: Valid Triangle Number
Minimum Operations to Make All Array Elements Equal
Solution: Minimum Operations to Make All Array Elements Equal
Sum of Mutated Array Closest to Target
Solution: Sum of Mutated Array Closest to Target
Range Sum of Sorted Subarray Sums
Solution: Range Sum of Sorted Subarray Sums
Magnetic Force Between Two Balls
Solution: Magnetic Force Between Two Balls
Find K-th Smallest Pair Distance
Solution: Find K-th Smallest Pair Distance
Minimum Space Wasted from Packaging
Solution: Minimum Space Wasted from Packaging
Russian Doll Envelopes
Solution: Russian Doll Envelopes
Put Marbles in Bags
Solution: Put Marbles in Bags
H-Index
Solution: H-Index
Two Sum Less Than K
Maximum Number of Integers to Choose from a Range I

18.

Matrices

31 Lessons

Work your way through matrix operations, traversal techniques, and essential problem-solving algorithms.
Introduction to Matrices
Set Matrix Zeroes
Solution: Set Matrix Zeroes
Rotate Image
Solution: Rotate Image
Spiral Matrix
Solution: Spiral Matrix
Where Will the Ball Fall
Solution: Where Will the Ball Fall
Transpose Matrix
Solution: Transpose Matrix
Count Negative Numbers in a Sorted Matrix
Solution: Count Negative Numbers in a Sorted Matrix
Minimum Time Takes to Reach Destination Without Drowning
Solution:Minimum Time Takes to Reach Destination Without Drowning
Smallest Rectangle Enclosing Black Pixels
Solution: Smallest Rectangle Enclosing Black Pixels
Island Perimeter
Solution: Island Perimeter
Convert 1D Array Into 2D Array
Solution: Convert 1D Array Into 2D Array
Spiral Matrix II
Solution: Spiral Matrix II
Flip Columns For Maximum Number of Equal Rows
Solution: Flip Columns For Maximum Number of Equal Rows
Number of Spaces Cleaning Robot Cleaned
Solution: Number of Spaces Cleaning Robot Cleaned
Minimize Maximum Value in a Grid
Solution: Minimize Maximum Value in a Grid
Kth Smallest Number in Multiplication Table
Solution: Kth Smallest Number in Multiplication Table

19.

Stacks

24 Lessons

Grasp the fundamentals of stacks, their applications, and various algorithmic implementations.
Introduction to Stacks
Basic Calculator
Solution: Basic Calculator
Remove All Adjacent Duplicates In String
Solution: Remove All Adjacent Duplicates In String
Minimum Remove to Make Valid Parentheses
Solution: Minimum Remove to Make Valid Parentheses
Exclusive Time of Functions
Solution: Exclusive Time of Functions
Flatten Nested List Iterator
Solution: Flatten Nested List Iterator
Implement Queue Using Stacks
Solution: Implement Queue Using Stacks
Daily Temperatures
Solution: Daily Temperatures
Decode String
Solution: Decode String
Minimum String Length After Removing Substrings
Solution: Minimum String Length After Removing Substrings
Number of Valid Subarrays
Solution: Number of Valid Subarrays
Number of Visible People in a Queue
Solution: Number of Visible People in a Queue
Valid Parentheses

20.

Graphs

31 Lessons

Dig deeper into graph theory, exploring applications, algorithms, and solving complex problems.
Introduction to Graphs
Network Delay Time
Solution: Network Delay Time
Paths in Maze That Lead to Same Room
Solution: Paths in Maze That Lead to Same Room
Clone Graph
Solution: Clone Graph
Graph Valid Tree
Solution: Graph Valid Tree
Bus Routes
Solution: Bus Routes
Reconstruct Itinerary
Solution: Reconstruct Itinerary
Find the Town Judge
Solution: Find the Town Judge
Find Center of Star Graph
Solution: Find Center of Star Graph
Lucky Numbers in a Matrix
Solution: Lucky Numbers in a Matrix
Path with Maximum Probability
Solution: Path with Maximum Probability
Tree Diameter
Solution: Tree Diameter
Reorder Routes to Make All Paths Lead to the City Zero
Solution: Reorder Routes to Make All Paths Lead to the City Zero
Minimum Cost to Make at Least One Valid Path in a Grid
Solution: Minimum Cost to Make at Least One Valid Path in a Grid
Longest Cycle in a Graph
Solution: Longest Cycle in a Graph
Shortest Cycle in a Graph
Solution: Shortest Cycle in a Graph

21.

Tree Depth-First Search

31 Lessons

Simplify complex topics in binary trees, DFS traversal, transformations, and search algorithms.
Introduction to Tree Depth-First Search
Flatten Binary Tree to Linked List
Solution: Flatten Binary Tree to Linked List
Diameter of Binary Tree
Solution: Diameter of Binary Tree
Serialize and Deserialize Binary Tree
Solution: Serialize and Deserialize Binary Tree
Invert Binary Tree
Solution: Invert Binary Tree
Binary Tree Maximum Path Sum
Solution: Binary Tree Maximum Path Sum
Convert Sorted Array to Binary Search Tree
Solution: Convert Sorted Array to Binary Search Tree
Build Binary Tree from Preorder and Inorder Traversal
Solution: Build Binary Tree from Preorder and Inorder Traversal
Binary Tree Right Side View
Solution: Binary Tree Right Side View
Lowest Common Ancestor of a Binary Tree
Solution: Lowest Common Ancestor of a Binary Tree
Validate Binary Search Tree
Solution: Validate Binary Search Tree
Nested List Weight Sum II
Solution: Nested List Weight Sum II
Inorder Successor in BST
Solution: Inorder Successor in BST
Height of Binary Tree After Subtree Removal Queries
Solution: Height of Binary Tree After Subtree Removal Queries
Delete Nodes And Return Forest
Solution: Delete Nodes And Return Forest
Maximum Depth of Binary Tree
Kth Smallest Element in a BST

22.

Tree Breadth-First Search

18 Lessons

Piece together the parts of tree breadth-first search techniques for effective tree traversal and manipulation.
Introduction to Tree Breadth-First Search
Binary Tree Level Order Traversal
Solution: Binary Tree Level Order Traversal
Binary Tree Zigzag Level Order Traversal
Solution: Binary Tree Zigzag Level Order Traversal
Populating Next Right Pointers in Each Node
Solution: Populating Next Right Pointers in Each Node
Vertical Order Traversal of a Binary Tree
Solution: Vertical Order Traversal of a Binary Tree
Symmetric Tree
Solution: Symmetric Tree
Word Ladder
Solution: Word Ladder
Two Sum IV – Input Is a BST
Solution: Two Sum IV – Input Is a BST
Find Minimum Diameter After Merging Two Trees
Solution: Find Minimum Diameter After Merging Two Trees
Connect All Siblings of a Binary Tree

24.

Hash Maps

36 Lessons

Look at understanding and implementing HashMaps for efficient data storage and retrieval.
Introduction to Hash Maps
Design HashMap
Solution: Design HashMap
Fraction to Recurring Decimal
Solution: Fraction to Recurring Decimal
Logger Rate Limiter
Solution: Logger Rate Limiter
Next Greater Element I
Solution: Next Greater Element I
Isomorphic Strings
Solution: Isomorphic Strings
Find Duplicate File in System
Solution: Find Duplicate File in System
Dot Product of Two Sparse Vectors
Solution: Dot Product of Two Sparse Vectors
High Five
Solution: High Five
Bulls and Cows
Solution: Bulls and Cows
Custom Sort String
Solution: Custom Sort String
Number of Distinct Islands
Solution: Number of Distinct Islands
Number of Wonderful Substrings
Solution: Number of Wonderful Substrings
Total Appeal of a String
Solution: Total Appeal of a String
Continuous Subarray Sum
Solution: Continuous Subarray Sum
Unique Number of Occurrences
Solution: Unique Number of Occurrences
Longest Happy Prefix
Solution: Longest Happy Prefix
Find Longest Self-Contained Substring
Solution: Find Longest Self-Contained Substring
Longest Palindrome

25.

Knowing What to Track

30 Lessons

Break apart knowing what to track for effective frequency analysis in coding problems.
Introduction to Knowing What to Track
Palindrome Permutation
Solution: Palindrome Permutation
Valid Anagram
Solution: Valid Anagram
Design Tic-Tac-Toe
Solution: Design Tic-Tac-Toe
Group Anagrams
Solution: Group Anagrams
Maximum Frequency Stack
Solution: Maximum Frequency Stack
First Unique Character in a String
Solution: First Unique Character in a String
Find All Anagrams in a String
Solution: Find All Anagrams in a String
Longest Palindrome by Concatenating Two-Letter Words
Solution: Longest Palindrome by Concatenating Two-Letter Words
Rank Teams by Votes
Solution: Rank Teams by Votes
Pairs of Songs With Total Durations Divisible by 60
Solution: Pairs of Songs With Total Durations Divisible by 60
Minimum Number of Pushes to Type Word II
Solution: Minimum Number of Pushes to Type Word II
Task Scheduler
Solution: Task Scheduler
Count Anagrams
Solution: Count Anagrams
Divide Array Into Increasing Sequences
Solution: Divide Array Into Increasing Sequences
Ransom Note

28.

Bitwise Manipulation

30 Lessons

Focus on bitwise operations, their applications in efficient problem-solving, and practical coding exercises.
Introduction to Bitwise Manipulation
Find the Difference
Solution: Find the Difference
Complement of Base 10 Integer
Solution: Complement of Base 10 Integer
Flipping an Image
Solution: Flipping an Image
Single Number
Solution: Single Number
Single Number II
Solution: Single Number II
Encode and Decode Strings
Solution: Encode and Decode Strings
Sum of All Subset XOR Totals
Solution: Sum of All Subset XOR Totals
Find The K-th Lucky Number
Solution: Find The K-th Lucky Number
Minimum Number of K Consecutive Bit Flips
Solution: Minimum Number of K Consecutive Bit Flips
Find the Longest Substring Having Vowels in Even Counts
Solution: Find the Longest Substring Having Vowels in Even Counts
Count Triplets That Can Form Two Arrays of Equal XOR
Solution: Count Triplets That Can Form Two Arrays of Equal XOR
Longest Subarray With Maximum Bitwise AND
Solution: Longest Subarray With Maximum Bitwise AND
Minimum One Bit Operations to Make Integers Zero
Solution: Minimum One Bit Operations to Make Integers Zero
Triples with Bitwise AND Equal To Zero
Solution: Triples with Bitwise AND Equal To Zero
Reverse Bits

29.

Math and Geometry

35 Lessons

Explore mathematical and geometric concepts to solve various coding challenges efficiently.
Introduction to Math and Geometry
Check If It Is a Straight Line
Solution: Check If It Is a Straight Line
Minimum Cuts to Divide a Circle
Solution: Minimum Cuts to Divide a Circle
Rectangle Overlap
Solution: Rectangle Overlap
Minimum Time Visiting All Points
Solution: Minimum Time Visiting All Points
Reverse Integer
Solution: Reverse Integer
Valid Square
Solution: Valid Square
Rectangle Area
Solution: Rectangle Area
Minimum Area Rectangle
Solution: Minimum Area Rectangle
Maximum Area Rectangle With Point Constraints I
Solution: Maximum Area Rectangle With Point Constraints I
Convex Polygon
Solution: Convex Polygon
Queries on Number of Points Inside a Circle
Solution: Queries on Number of Points Inside a Circle
Max Points on a Line
Solution: Max Points on a Line
Maximum Number of Visible Points
Solution: Maximum Number of Visible Points
Minimize Manhattan Distances
Solution: Minimize Manhattan Distances
Self Crossing
Solution: Self Crossing
Erect the Fence
Solution: Erect the Fence
Minimum Number of Lines to Cover Points
Detonate the Maximum Bombs

30.

Challenge Yourself

40 Lessons

Test your understanding of coding interview challenges to apply and reinforce your skills.
Challenge Yourself: Introduction
Shortest Bridge
Number of Connected Components in an Undirected Graph
Median of Two Sorted Arrays
Pacific Atlantic Water Flow
Contains Duplicate
Maximum Subarray
Two Sum
Find Minimum in Rotated Sorted Array
Non-overlapping Intervals
Meeting Rooms
Largest Rectangle in Histogram
Subtree of Another Tree
Sort List
Number of 1 Bits
Container with Most Water
Evaluate Reverse Polish Notation
4Sum
Loud and Rich
Product of Array Except Self
Longest Increasing Subsequence
Sum of Two Integers
Majority Element
Unique Paths
Longest Palindromic Substring
Permutations II
Number of Provinces
Linked List Cycle II
Minimum Flips to Make the Binary String Alternate
Lemonade Change
House Robber
Find All Numbers Disappeared in an Array
Find All Duplicates in an Array
Same Tree
Design In-Memory File System
Design File System
Asteroid Collision
Rotting Oranges
Add Binary
Multiply Strings

31.

Conclusion

1 Lessons

Get familiar with additional courses to enhance your coding interview skills.
Where to Go from Here?
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Free Resources

Frequently Asked Questions

How useful is grokking the coding interview?

Many users find Grokking the Coding Interview useful as it provides a structured approach to understanding and solving common coding patterns. It helps you recognize and apply key strategies across various problems, improving problem-solving skills and boosting confidence for technical interviews. Educative offers this course in 6 languages, covering 228 coding problems in detail.

Is C++ good for coding interviews?

Yes, C++ is a great choice for coding interviews. It offers efficient memory management with pointers and direct control over system resources. C++ also has a rich standard library with useful tools and data structures, and its support for object-oriented programming and templates can help you write optimized and flexible solutions.

How to get ready for a C++ coding interview?

To get ready for a C++ coding interview, focus on core C++ principles, including data structures (like arrays and linked lists), algorithms (such as sorting and searching), and object-oriented concepts (like classes and inheritance). Understanding memory management is also crucial. Practice coding challenges on platforms like Educative, LeetCode, and HackerRank to enhance your problem-solving skills and apply these concepts effectively.

Does the course, grokking the coding interview, provide coding examples in C++?

Yes, every pattern is explained with detailed C++ code examples to help you understand and implement solutions effectively.

Is the course grokking, the coding interview suitable for beginners in C++?

Yes, the course is designed for both beginners and intermediate learners. It offers step-by-step explanations of each pattern and covers every coding problem in detail.

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