DSA / Coding

Data structures & algorithms on a whiteboard or shared editor.

Adobe
Lowest common ancestor of a binary tree.
BackendStaff+Medium◆ Commonly asked
#tree
PracticeLeetCode GeeksforGeeks
Adobe
Top K frequent elements.
BackendStaff+Medium◆ Commonly asked
#heap#hashmap
PracticeLeetCode GeeksforGeeks
Adobe
Edit distance.
BackendStaff+Hard◆ Commonly asked
#dp#string
PracticeLeetCode GeeksforGeeks
Adobe
Diameter of a binary tree.
Full-stackNew Grad / JuniorEasy◆ Commonly asked
#tree#dfs
PracticeLeetCode GeeksforGeeks
Adobe
Implement a trie (prefix tree).
Full-stackNew Grad / JuniorMedium◆ Commonly asked
#trie
PracticeLeetCode GeeksforGeeks
Adobe
Contains duplicate.
Full-stackNew Grad / JuniorEasy◆ Commonly asked
#array#hashmap
PracticeLeetCode GeeksforGeeks
Adobe
Jump game.
BackendSeniorMedium◆ Commonly asked
#greedy#dp
PracticeLeetCode GeeksforGeeks
Adobe
Group anagrams from a list of strings.
BackendSeniorMedium◆ Commonly asked
#hashmap#string
PracticeLeetCode GeeksforGeeks
Adobe
Largest rectangle in histogram.
BackendSeniorHard◆ Commonly asked
#stack#monotonic-stack
PracticeLeetCode GeeksforGeeks
Adobe
Sort colors.
FrontendMidMedium◆ Commonly asked
#two-pointers#array
PracticeLeetCode GeeksforGeeks
Adobe
Binary tree maximum path sum.
FrontendMidHard◆ Commonly asked
#tree#dfs
PracticeLeetCode GeeksforGeeks
Adobe
Daily temperatures.
FrontendMidMedium◆ Commonly asked
#stack#monotonic-stack
PracticeLeetCode GeeksforGeeks
Adobe
Pow(x, n).
Full-stackMidMedium◆ Commonly asked
#math#recursion
PracticeLeetCode GeeksforGeeks
Adobe
3Sum.
Full-stackMidMedium◆ Commonly asked
#two-pointers#array
PracticeLeetCode GeeksforGeeks
Adobe
Median of two sorted arrays.
Full-stackMidHard◆ Commonly asked
#binary-search
PracticeLeetCode GeeksforGeeks
Affirm
Trapping rain water.
FrontendMidHard◆ Commonly asked
#two-pointers#array
PracticeLeetCode GeeksforGeeks
Affirm
Edit distance.
FrontendMidHard◆ Commonly asked
#dp#string
PracticeLeetCode GeeksforGeeks
Affirm
House robber II.
FrontendMidMedium◆ Commonly asked
#dp
PracticeLeetCode GeeksforGeeks
Affirm
Lowest common ancestor of a binary tree.
Full-stackMidMedium◆ Commonly asked
#tree
PracticeLeetCode GeeksforGeeks
Affirm
Subsets.
Full-stackMidMedium◆ Commonly asked
#backtracking
PracticeLeetCode GeeksforGeeks
Affirm
Diameter of a binary tree.
Full-stackMidEasy◆ Commonly asked
#tree#dfs
PracticeLeetCode GeeksforGeeks
Affirm
Reverse nodes in k-group.
BackendNew Grad / JuniorHard◆ Commonly asked
#linked-list
PracticeLeetCode GeeksforGeeks
Affirm
Jump game.
BackendNew Grad / JuniorMedium◆ Commonly asked
#greedy#dp
PracticeLeetCode GeeksforGeeks
Affirm
Word search II.
BackendNew Grad / JuniorHard◆ Commonly asked
#trie#backtracking
PracticeLeetCode GeeksforGeeks
Affirm
Merge k sorted lists.
FrontendStaff+Hard◆ Commonly asked
#heap#linked-list
PracticeLeetCode GeeksforGeeks
Affirm
Construct binary tree from preorder and inorder traversal.
FrontendStaff+Medium◆ Commonly asked
#tree#recursion
PracticeLeetCode GeeksforGeeks
Affirm
Longest increasing subsequence.
FrontendStaff+Hard◆ Commonly asked
#dp#binary-search
PracticeLeetCode GeeksforGeeks
Affirm
Longest palindromic substring.
Full-stackStaff+Medium◆ Commonly asked
#string#dp
PracticeLeetCode GeeksforGeeks
Affirm
Implement a trie (prefix tree).
Full-stackStaff+Medium◆ Commonly asked
#trie
PracticeLeetCode GeeksforGeeks
Affirm
Climbing stairs.
Full-stackStaff+Easy◆ Commonly asked
#dp
PracticeLeetCode GeeksforGeeks
Airbnb
Set matrix zeroes.
BackendSeniorMedium◆ Commonly asked
#matrix
PracticeLeetCode GeeksforGeeks
Airbnb
Number of islands in a 2D grid.
BackendSeniorMedium◆ Commonly asked
#bfs#dfs#grid
PracticeLeetCode GeeksforGeeks
Airbnb
Sliding window maximum.
BackendSeniorHard◆ Commonly asked
#deque#sliding-window
PracticeLeetCode GeeksforGeeks
Airbnb
Longest increasing subsequence.
FrontendMidHard◆ Commonly asked
#dp#binary-search
PracticeLeetCode GeeksforGeeks
Airbnb
Rotate array.
FrontendMidMedium◆ Commonly asked
#array
PracticeLeetCode GeeksforGeeks
Airbnb
Merge two sorted linked lists.
FrontendMidEasy◆ Commonly asked
#linked-list
PracticeLeetCode GeeksforGeeks
Airbnb
Insert interval.
Full-stackMidMedium◆ Commonly asked
#intervals
PracticeLeetCode GeeksforGeeks
Airbnb
Longest substring without repeating characters.
Full-stackMidMedium◆ Commonly asked
#sliding-window#string
PracticeLeetCode GeeksforGeeks
Airbnb
Longest consecutive sequence.
Full-stackMidMedium◆ Commonly asked
#hashmap#array
PracticeLeetCode GeeksforGeeks
Airbnb
Word search II.
BackendNew Grad / JuniorHard◆ Commonly asked
#trie#backtracking
PracticeLeetCode GeeksforGeeks
Airbnb
Binary tree maximum path sum.
BackendNew Grad / JuniorHard◆ Commonly asked
#tree#dfs
PracticeLeetCode GeeksforGeeks
Airbnb
Product of array except self.
BackendNew Grad / JuniorMedium◆ Commonly asked
#array#prefix-sum
PracticeLeetCode GeeksforGeeks
Airbnb
Meeting rooms II — minimum rooms required.
FrontendStaff+Medium◆ Commonly asked
#heap#intervals
PracticeLeetCode GeeksforGeeks
Airbnb
House robber II.
FrontendStaff+Medium◆ Commonly asked
#dp
PracticeLeetCode GeeksforGeeks
Airbnb
Lowest common ancestor of a binary tree.
FrontendStaff+Medium◆ Commonly asked
#tree
PracticeLeetCode GeeksforGeeks
Airtable
Implement a trie (prefix tree).
BackendSeniorMedium◆ Commonly asked
#trie
PracticeLeetCode GeeksforGeeks
Airtable
Set matrix zeroes.
BackendSeniorMedium◆ Commonly asked
#matrix
PracticeLeetCode GeeksforGeeks
Airtable
Edit distance.
BackendSeniorHard◆ Commonly asked
#dp#string
PracticeLeetCode GeeksforGeeks
Airtable
Permutations.
FrontendMidMedium◆ Commonly asked
#backtracking
PracticeLeetCode GeeksforGeeks
Airtable
Same tree.
FrontendMidEasy◆ Commonly asked
#tree
PracticeLeetCode GeeksforGeeks
Airtable
Sliding window maximum.
FrontendMidHard◆ Commonly asked
#deque#sliding-window
PracticeLeetCode GeeksforGeeks
Airtable
Coin change — fewest coins to make an amount.
Full-stackMidMedium◆ Commonly asked
#dp
PracticeLeetCode GeeksforGeeks
Airtable
Trapping rain water.
Full-stackMidHard◆ Commonly asked
#two-pointers#array
PracticeLeetCode GeeksforGeeks
Airtable
Merge two sorted linked lists.
Full-stackMidEasy◆ Commonly asked
#linked-list
PracticeLeetCode GeeksforGeeks
Airtable
Merge intervals.
BackendNew Grad / JuniorMedium◆ Commonly asked
#intervals#sorting
PracticeLeetCode GeeksforGeeks
Airtable
Jump game.
BackendNew Grad / JuniorMedium◆ Commonly asked
#greedy#dp
PracticeLeetCode GeeksforGeeks
Airtable
Meeting rooms II — minimum rooms required.
BackendNew Grad / JuniorMedium◆ Commonly asked
#heap#intervals
PracticeLeetCode GeeksforGeeks
Airtable
Number of islands in a 2D grid.
FrontendStaff+Medium◆ Commonly asked
#bfs#dfs#grid
PracticeLeetCode GeeksforGeeks
Airtable
Kth smallest element in a BST.
FrontendStaff+Medium◆ Commonly asked
#tree#bst
PracticeLeetCode GeeksforGeeks
Airtable
Container with most water.
FrontendStaff+Medium◆ Commonly asked
#two-pointers#array
PracticeLeetCode GeeksforGeeks

More practice · open source

Topic banks

59extra questions on this round's topics, imported from MIT-licensed open-source repositories. These are topic questions — they are not attributed to any company.

Data Structures31 questions

What is data-structure?
What is a graph?
What is linear searching?
What is algorithm?
What is linear data structure and what are common operations to perform on it?
What is an average case complexity of Bubble Sort?
What examples of greedy algorithms do you know?
What are some examples of divide and conquer algorithms?
What are some examples of dynamic programming algorithms?
Why do we use stacks?
Why do we use queues?
What is Selection Sort?
Why we need to do algorithm analysis?
What is the difference between Linear Search and Binary Search?
What is asymptotic analysis of an algorithm?
Name some approaches to develop algorithms
What is Circular Queue and why will you use one?
Why is Insertion sort better than Quick sort for small list of elements?
Tell me something about Insertion sort?
List some advantages of Insertion Sort
How Insertion sort and Selection sorts are different?
What is Merge Sort and how it works?
How Quick Sort works?
What is Shell Sort?
Is there ever a good reason to use Insertion Sort?
Is there any advantages of Bubble Sort?
What is Bucket Sort?
What is Tim Sort and how would you compare it with Quick Sort?
Why is Quick Sort better than Merge Sort?
What is stability in sorting algorithms and why is it important?
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⎇ FAQGURU/FAQGURU · MIT ↗

Code Problems28 questions

Test divisors of three
Sum of Array Plus One
String Rotation
Oddball sum
Simple clock angle
Sum of several arrays
Lucky sevens
Two sum problem
Implement a queue using a linked list
Tree Level Order Print
Stock maximum profit
Find Word Positions in Text
Determine overlapping numbers in ranges
Throttle Function Implementation
Dutch national flag sorting problem
Step-by-step solution for step counting using recursion
Implement Bubble Sort
Implement a queue using two stacks
Implement pow(a,b) without multiplication or division
Generate all balanced bracket combinations
All Permutations (Anagrams) of a String
Merge two sorted linked lists
Insert an interval into a list of sorted disjoint intervals
Find all string combinations consisting only of 0, 1 and ?
Quickly calculate the cube root of 6 digit numbers
Transform Word
Find the missing value in a set of number from 1 to n
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⎇ FAQGURU/FAQGURU · MIT ↗