System1 LeetCode Interview Questions

Practice 38 coding problems currently tagged to System1. Use the frequency and topic signals to build a focused software engineering interview practice plan.

14 Easy

22 Medium

2 Hard

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Problem	DifficultyDiff	Frequency	Topics	Action
Insert into a Sorted Circular Linked List 100%	MediumM	100%	Linked List	Solve→
Find Peak Element 92%	MediumM	92%	Array Binary Search	Solve→
Add Strings 88%	EasyE	88%	Math String+1	Solve→
Simplify Path 88%	MediumM	88%	String Stack	Solve→
Binary Tree Vertical Order Traversal 86%	MediumM	86%	Hash Table Tree+4	Solve→
Walls and Gates 82%	MediumM	82%	Array Breadth-First Search+1	Solve→
String to Integer (atoi) 80%	MediumM	80%	String	Solve→
Minimum Area Rectangle 79%	MediumM	79%	Array Hash Table+3	Solve→
Longest Increasing Subsequence 72%	MediumM	72%	Array Binary Search+1	Solve→
Reverse Linked List 72%	EasyE	72%	Linked List Recursion	Solve→
Minimum Limit of Balls in a Bag 71%	MediumM	71%	Array Binary Search	Solve→
Search Insert Position 70%	EasyE	70%	Array Binary Search	Solve→
Maximum Beauty of an Array After Applying Operation 70%	MediumM	70%	Array Binary Search+2	Solve→
Longest Palindromic Substring 69%	MediumM	69%	Two Pointers String+1	Solve→
Ransom Note 67%	EasyE	67%	Hash Table String+1	Solve→
Copy List with Random Pointer 61%	MediumM	61%	Hash Table Linked List	Solve→
Adding Spaces to a String 58%	MediumM	58%	Array Two Pointers+2	Solve→
Create Hello World Function 57%	EasyE	57%		Solve→
String Compression 57%	MediumM	57%	Two Pointers String	Solve→
Alien Dictionary 55%	HardH	55%	Array String+4	Solve→
Check If a Word Occurs As a Prefix of Any Word in a Sentence 53%	EasyE	53%	Two Pointers String+1	Solve→
Rank Transform of a Matrix 48%	HardH	48%	Array Union Find+4	Solve→
Pascal's Triangle 47%	EasyE	47%	Array Dynamic Programming	Solve→
Maximum Size Subarray Sum Equals k 46%	MediumM	46%	Array Hash Table+1	Solve→
Missing Ranges 43%	EasyE	43%	Array	Solve→

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Final Array State After K Multiplication Operations I 41%	EasyE	41%	Array Math+2	Solve→
Same Tree 37%	EasyE	37%	Tree Depth-First Search+2	Solve→
Analyze User Website Visit Pattern 35%	MediumM	35%	Array Hash Table+1	Solve→
Check If N and Its Double Exist 34%	EasyE	34%	Array Hash Table+3	Solve→
Remove All Adjacent Duplicates In String 33%	EasyE	33%	String Stack	Solve→
Open the Lock 31%	MediumM	31%	Array Hash Table+2	Solve→
Zero Array Transformation II 27%	MediumM	27%	Array Binary Search+1	Solve→
Find K Closest Elements 26%	MediumM	26%	Array Two Pointers+4	Solve→
Diameter of Binary Tree 26%	EasyE	26%	Tree Depth-First Search+1	Solve→
Search Suggestions System 23%	MediumM	23%	Array String+4	Solve→
Valid Palindrome 20%	EasyE	20%	Two Pointers String	Solve→
Kth Largest Element in an Array 20%	MediumM	20%	Array Divide and Conquer+3	Solve→
K-diff Pairs in an Array 20%	MediumM	20%	Array Hash Table+3	Solve→

Explore company practice sets with a similar number of tagged coding questions.

Frequently Asked Questions

What LeetCode problems are tagged to System1?

Our current System1 practice dataset contains 38 tagged coding problems, including Insert into a Sorted Circular Linked List, Find Peak Element, Add Strings. The difficulty breakdown is 14 Easy, 22 Medium, and 2 Hard problems.

How should I prepare for a System1 coding interview?

Focus on the most frequently asked problems first, especially those with high frequency scores. System1 interviews typically emphasize Array and String. Practice explaining your thought process while coding.

What is the difficulty level of System1 coding interviews?

Based on our data, System1 interviews include 14 Easy (37%), 22 Medium (58%), and 2 Hard (5%) problems.

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System1 LeetCode Interview Questions

Practice 38 coding problems currently tagged to System1. Use the frequency and topic signals to build a focused software engineering interview practice plan.

14 Easy

22 Medium

2 Hard

Problem	DifficultyDiff	Frequency	Topics	Action
Insert into a Sorted Circular Linked List 100%	MediumM	100%	Linked List	Solve→
Find Peak Element 92%	MediumM	92%	Array Binary Search	Solve→
Add Strings 88%	EasyE	88%	Math String+1	Solve→
Simplify Path 88%	MediumM	88%	String Stack	Solve→
Binary Tree Vertical Order Traversal 86%	MediumM	86%	Hash Table Tree+4	Solve→
Walls and Gates 82%	MediumM	82%	Array Breadth-First Search+1	Solve→
String to Integer (atoi) 80%	MediumM	80%	String	Solve→
Minimum Area Rectangle 79%	MediumM	79%	Array Hash Table+3	Solve→
Longest Increasing Subsequence 72%	MediumM	72%	Array Binary Search+1	Solve→
Reverse Linked List 72%	EasyE	72%	Linked List Recursion	Solve→
Minimum Limit of Balls in a Bag 71%	MediumM	71%	Array Binary Search	Solve→
Search Insert Position 70%	EasyE	70%	Array Binary Search	Solve→
Maximum Beauty of an Array After Applying Operation 70%	MediumM	70%	Array Binary Search+2	Solve→
Longest Palindromic Substring 69%	MediumM	69%	Two Pointers String+1	Solve→
Ransom Note 67%	EasyE	67%	Hash Table String+1	Solve→
Copy List with Random Pointer 61%	MediumM	61%	Hash Table Linked List	Solve→
Adding Spaces to a String 58%	MediumM	58%	Array Two Pointers+2	Solve→
Create Hello World Function 57%	EasyE	57%		Solve→
String Compression 57%	MediumM	57%	Two Pointers String	Solve→
Alien Dictionary 55%	HardH	55%	Array String+4	Solve→
Check If a Word Occurs As a Prefix of Any Word in a Sentence 53%	EasyE	53%	Two Pointers String+1	Solve→
Rank Transform of a Matrix 48%	HardH	48%	Array Union Find+4	Solve→
Pascal's Triangle 47%	EasyE	47%	Array Dynamic Programming	Solve→
Maximum Size Subarray Sum Equals k 46%	MediumM	46%	Array Hash Table+1	Solve→
Missing Ranges 43%	EasyE	43%	Array	Solve→

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Get real-time solutions during your actual coding interview. Invisible to screensharing.

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Final Array State After K Multiplication Operations I 41%	EasyE	41%	Array Math+2	Solve→
Same Tree 37%	EasyE	37%	Tree Depth-First Search+2	Solve→
Analyze User Website Visit Pattern 35%	MediumM	35%	Array Hash Table+1	Solve→
Check If N and Its Double Exist 34%	EasyE	34%	Array Hash Table+3	Solve→
Remove All Adjacent Duplicates In String 33%	EasyE	33%	String Stack	Solve→
Open the Lock 31%	MediumM	31%	Array Hash Table+2	Solve→
Zero Array Transformation II 27%	MediumM	27%	Array Binary Search+1	Solve→
Find K Closest Elements 26%	MediumM	26%	Array Two Pointers+4	Solve→
Diameter of Binary Tree 26%	EasyE	26%	Tree Depth-First Search+1	Solve→
Search Suggestions System 23%	MediumM	23%	Array String+4	Solve→
Valid Palindrome 20%	EasyE	20%	Two Pointers String	Solve→
Kth Largest Element in an Array 20%	MediumM	20%	Array Divide and Conquer+3	Solve→
K-diff Pairs in an Array 20%	MediumM	20%	Array Hash Table+3	Solve→