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Problem Solving Mastery

Practice. Interview. Excel.

Structured learning paths designed to help you ace coding interviews through real-time AI simulations and instant feedback.

Arrays

26 problems

Strings

13 problems

DP

17 problems

Trees

11 problems

Graphs

7 problems

Hash Tables

9 problems

Study Plans

Blind 75

Essential 75 LeetCode questions

Coming Soon

Blind 150

Comprehensive interview prep

Coming Soon

Exp 30

Top 30 frequent questions

Coming Soon

Exp 180

Master experimental questions

#1

Best Time to Buy and Sell Stock

Easy
92% Freq
#Array#Dynamic Programming
MicrosoftFacebookGoogleOracleAmazonGoldman Sachs
#2

Contains Duplicate

Easy
80% Freq
#Array#Hash Table#Sorting
AmazonGoogleMicrosoftAdobeApple
#3

Product of Array Except Self

Medium
90% Freq
#Array#Prefix Sum
AmazonFacebookMicrosoftAppleAsana
#4

Maximum Subarray

Medium
88% Freq
#Dynamic Programming#Array#Divide and Conquer+1
MicrosoftGoogleAppleFacebookLinkedInAmazon
#5

Valid Palindrome

Easy
85% Freq
#Two Pointers#String
FacebookMicrosoftAmazonAppleGoogle
#6

3Sum

Medium
94% Freq
#Array#Two Pointers#Sorting
AmazonFacebookMicrosoftAppleGoogle
#7

Container With Most Water

Medium
82% Freq
#Array#Two Pointers#Greedy+1
AmazonGoogleFacebookMicrosoftApple
#8

Longest Substring Without Repeating Characters

Medium
96% Freq
#Hash Table#String#Sliding Window
AmazonMicrosoftFacebookGoogleBloomberg
#9

Longest Repeating Character Replacement

Medium
75% Freq
#Hash Table#String#Sliding Window
GoogleAmazonFacebookMicrosoftUber
#10

Valid Parentheses

Easy
98% Freq
#String#Stack
AmazonMicrosoftFacebookGoogleBloomberg
#11

Search in Rotated Sorted Array

Medium
89% Freq
#Array#Binary Search
AmazonMicrosoftFacebookLinkedInGoogle
#12

Find Minimum in Rotated Sorted Array

Medium
78% Freq
#Array#Binary Search
AmazonMicrosoftFacebookGoldman SachsGoogle
#13

Maximum Product Subarray

Medium
81% Freq
#Array#Dynamic Programming
AmazonLinkedInGoogleMicrosoftApple
#14

Maximum Depth Of Binary Tree

Medium
#Trees#BFS#Tree#DFS
Amazon
#15

Invert Binary Tree

Medium
#Trees#BFS#Tree#DFS
Google
#16

Same Tree

Medium
#Trees#BFS#Tree#DFS
Amazon
#17

Missing Number

Medium
#Binary_bitManipulation#Bit Manipulation#Array
Amazon
#18

Counting Bits

Medium
#Binary_bitManipulation#Bit Manipulation#Dynamic Programming
Amazon
#19

Reverse Linked List

Medium
#Linked List#LinkedList
MicrosoftAmazon
#20

Merge Two Sorted Lists

Medium
#Linked List#LinkedList
MicrosoftAmazon
#21

Reorder List

Medium
#Linked List#LinkedList
Amazon
#22

Remove Nth Node From End Of List

Medium
#LinkedList#Two Pointers#Linked List
Facebook
#23

Number Of Islands

Medium
#BFS#Graph#Union Find#DFS
FacebookAmazonGoogle
#24

Merge Intervals

Medium
#Intervals#Array
FacebookAmazonGoogle
#25

Non Overlapping Intervals

Medium
#Array#Intervals#Greedy
Facebook
#26

Two Sum

Medium
#Array#Arrays#Hash Table
FacebookAmazonMicrosoftGoogle
#27

Group Anagrams

Medium
#String#Hash Table
FacebookAmazon
#28

Minimum Window Substring

Medium
#String#Sliding Window#Hash Table
AmazonFacebookGoogle
#29

Valid Anagram

Medium
#String#Hash Table
MicrosoftAmazon
#30

Longest Palindromic Substring

Medium
#String#Dynamic Programming
FacebookAmazon
#31

Unique Paths

Medium
#DynamicProgramming#Dynamic Programming
FacebookAmazon
#32

Combination Sum

Medium
#Array#Backtracking#DynamicProgramming
FacebookAmazon
#33

Word Break

Medium
#Trie#String#DynamicProgramming#Dynamic Programming
FacebookAmazonGoogle
#34

House Robber

Medium
#DynamicProgramming#Dynamic Programming
Amazon
#35

Jump Game

Medium
#Dynamic Programming#Array#DynamicProgramming#Greedy
Amazon
#36

Decode Ways

Medium
#String#DynamicProgramming#Dynamic Programming
AmazonFacebook
#37

Climbing Stairs

Medium
#DynamicProgramming#Dynamic Programming
AppleAmazon
#38

Coin Change

Medium
#Array#DynamicProgramming#Dynamic Programming
FacebookAmazon
#39

Spiral Matrix

Medium
#Array#matrix#Matrix
FacebookAmazon
#40

Rotate Image

Medium
#Array#matrix#Matrix
FacebookAmazon
#41

Merge k Sorted Lists

Hard
#Heap#Divide and Conquer#Linked List
FacebookAmazonGoogle
#42

Validate Binary Search Tree

Medium
#BST#Tree#DFS
FacebookAmazon
#43

Number Of 1 Bits

Medium
#Bit Manipulation
Apple
#44

Implement Trie Prefix Tree

Medium
#Design#Trie
AmazonGoogle
#45

Longest Consecutive Sequence

Medium
#Array#Union Find#Hash Table
AmazonGoogle
#46

Binary Tree Maximum Path Sum

Medium
#Dynamic Programming#Tree#DFS
AmazonFacebook
#47

House Robber Ii

Medium
#Dynamic Programming
Amazon
#48

Alien Dictionary

Medium
#Topological Sort#Graph
AmazonFacebookGoogle
#49

Linked List Cycle

Medium
#Linked List#Two Pointers
MicrosoftAmazon
#50

Insert Interval

Medium
#Intervals#Array
FacebookGoogle
#51

Reverse Bits

Medium
#Bit Manipulation
Apple
#55

Clone Graph

Medium
#BFS#Graph#DFS
AmazonFacebook
#56

Word Search Ii

Medium
#Backtracking#Trie#DFS
AmazonGoogle
#57

Serialize And Deserialize Binary Tree

Medium
#BFS#Tree#Design#DFS
AmazonFacebookGoogle
#58

Sum Of Two Integers

Medium
#Bit Manipulation
Facebook
#59

Kth Smallest Element In A Bst

Medium
#BST#Tree#DFS
FacebookAmazon
#61

Encode And Decode Strings

Medium
#String#Design
FacebookGoogle
#62

Subtree Of Another Tree

Medium
#Tree#DFS
FacebookAmazon
#63

Palindromic Substrings

Medium
#String#Dynamic Programming
Facebook
#65

Graph Valid Tree

Medium
#BFS#Graph#Union Find#DFS
FacebookGoogle
#66

Longest Increasing Subsequence

Medium
#Array#Binary Search#Dynamic Programming
FacebookAmazon
#67

Word Search

Medium
#Array#Backtracking#DFS
FacebookAmazon
#69

Set Matrix Zeroes

Medium
#Matrix#Array
FacebookAmazon
#70

Course Schedule

Medium
#BFS#Topological Sort#Graph#DFS
FacebookAmazon
#71

Meeting Rooms Ii

Medium
#Heap#Array#Intervals
FacebookAmazonGoogle
#72

Top K Frequent Elements

Medium
#Heap#Array#Hash Table
FacebookAmazon
#73

Meeting Rooms

Medium
#Intervals#Array
FacebookAmazon
#74

Longest Common Subsequence

Medium
#String#Dynamic Programming
Amazon
#75

Find Median from Data Stream

Hard
#Heap#Design
FacebookAmazonGoogle
More coming soon

We are constantly adding new problems and companies to our database.