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Questions Summary
TIME NEEDED 140 hours
Fits into your schedule.
DIFFICULTY Easy: 42 Medium: 98 Hard: 20
Array: 23 Binary: 7 Binary Search: 8 Binary Search Tree: 5 Binary Tree: 18
TOPICS Dynamic Programming: 11 Graph: 21 Hash Table: 1 Heap: 7 Linked List: 13 Math: 5 Matrix: 4
Queue: 1 Recursion: 5 Stack: 14 String: 13 Trie: 4
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Based on Preferences Order by Difficulty Group by Weeks Show topics
Week 1 2 / 12
1 Two Sum
Easy · 15 mins
2 Valid Parentheses
Easy · 20 mins
3 Merge Two Sorted Lists
Easy · 20 mins
4 Best Time to Buy and Sell Stock
Easy · 20 mins
5 Valid Palindrome
Easy · 15 mins
6 Invert Binary Tree
Easy · 15 mins
7 Valid Anagram
Easy · 15 mins
8 Binary Search
Easy · 15 mins
9 Flood Fill
Easy · 20 mins
10 Maximum Subarray
Easy · 20 mins
11 Lowest Common Ancestor of a Binary Search Tree
Easy · 20 mins
12 Balanced Binary Tree
Easy · 15 mins
Week 2 0 / 10
1 Linked List Cycle
Easy · 20 mins
2 Implement Queue using Stacks
Easy · 20 mins
3 First Bad Version
Easy · 20 mins
4 Ransom Note
Easy · 15 mins
Climbing Stairs
5 Easy · 20 mins
6 Longest Palindrome
Easy · 20 mins
7 Reverse Linked List
Easy · 20 mins
8 Majority Element
Easy · 20 mins
9 Add Binary
Easy · 15 mins
10 Diameter of Binary Tree
Easy · 30 mins
Week 3 0 / 12
1 Middle of the Linked List
Easy · 20 mins
2 Maximum Depth of Binary Tree
Easy · 15 mins
3 Contains Duplicate
Easy · 15 mins
4 Meeting Rooms
Easy · 20 mins
5 Roman to Integer
Easy · 20 mins
6 Backspace String Compare
Easy · 15 mins
7 Counting Bits
Easy · 15 mins
8 Same Tree
Easy · 20 mins
9 Number of 1 Bits
Easy · 15 mins
10 Longest Common Prefix
Easy · 20 mins
11 Single Number
Easy · 15 mins
12 Palindrome Linked List
Easy · 20 mins
Week 4 0 / 10
1 Move Zeroes
Easy · 20 mins
2 Symmetric Tree
Easy · 20 mins
3 Missing Number
Easy · 15 mins
4 Palindrome Number
Easy · 15 mins
5 Convert Sorted Array to Binary Search Tree
Easy · 20 mins
6 Reverse Bits
Easy · 15 mins
7 Subtree of Another Tree
Easy · 20 mins
8 Squares of a Sorted Array
Easy · 20 mins
9 Insert Interval
Medium · 25 mins
10 01 Matrix
Medium · 30 mins
Week 5 0 / 7
1 K Closest Points to Origin
Medium · 30 mins
2 Longest Substring Without Repeating Characters
Medium · 30 mins
3 3Sum
Medium · 30 mins
4 Binary Tree Level Order Traversal
Medium · 20 mins
5 Clone Graph
Medium · 25 mins
6 Evaluate Reverse Polish Notation
Medium · 30 mins
7 Course Schedule
Medium · 30 mins
Week 6 0 / 7
1 Implement Trie (Prefix Tree)
Medium · 35 mins
2 Coin Change
Medium · 25 mins
3 Product of Array Except Self
Medium · 30 mins
4 Min Stack
Medium · 20 mins
5 Validate Binary Search Tree
Medium · 20 mins
6 Number of Islands
Medium · 25 mins
7 Rotting Oranges
Medium · 30 mins
Week 7 0 / 7
1 Search in Rotated Sorted Array
Medium · 30 mins
2 Combination Sum
Medium · 30 mins
3 Permutations
Medium · 30 mins
4 Merge Intervals
Medium · 30 mins
5 Lowest Common Ancestor of a Binary Tree
Medium · 25 mins
6 Time Based Key-Value Store
Medium · 35 mins
7 Accounts Merge
Medium · 30 mins
Week 8 0 / 8
1 Sort Colors
Medium · 25 mins
2 Word Break
Medium · 30 mins
3 Partition Equal Subset Sum
Medium · 30 mins
4 String to Integer (atoi)
Medium · 25 mins
5 Spiral Matrix
Medium · 25 mins
6 Subsets
Medium · 30 mins
7 Binary Tree Right Side View
Medium · 20 mins
8 Longest Palindromic Substring
Medium · 25 mins
Week 9 0 / 7
1 Unique Paths
Medium · 20 mins
2 Construct Binary Tree from Preorder and Inorder Traversal
Medium · 25 mins
3 Container With Most Water
Medium · 35 mins
4 Letter Combinations of a Phone Number
Medium · 30 mins
5 Word Search
Medium · 30 mins
6 Find All Anagrams in a String
Medium · 30 mins
7 Minimum Height Trees
Medium · 30 mins
Week 10 0 / 7
1 Task Scheduler
Medium · 35 mins
2 LRU Cache
Medium · 30 mins
3 Kth Smallest Element in a BST
Medium · 25 mins
4 Daily Temperatures
Medium · 30 mins
5 House Robber
Medium · 25 mins
6 Gas Station
Medium · 30 mins
7 Next Permutation
Medium · 30 mins
Week 11 0 / 7
1 Valid Sudoku
Medium · 35 mins
2 Group Anagrams
Medium · 25 mins
3 Maximum Product Subarray
Medium · 30 mins
4 Design Add and Search Words Data Structure
Medium · 35 mins
5 Pacific Atlantic Water Flow
Medium · 30 mins
Remove Nth Node From End of List
6 Medium · 20 mins
7 Shortest Path to Get Food
Medium · 30 mins
Week 12 0 / 7
1 Find the Duplicate Number
Medium · 20 mins
2 Top K Frequent Words
Medium · 30 mins
3 Longest Increasing Subsequence
Medium · 30 mins
4 Graph Valid Tree
Medium · 30 mins
5 Course Schedule II
Medium · 35 mins
6 Swap Nodes in Pairs
Medium · 25 mins
7 Path Sum II
Medium · 25 mins
Week 13 0 / 7
1 Longest Consecutive Sequence
Medium · 30 mins
2 Rotate Array
Medium · 25 mins
3 Odd Even Linked List
Medium · 25 mins
4 Decode String
Medium · 30 mins
5 Contiguous Array
Medium · 30 mins
6 Maximum Width of Binary Tree
Medium · 20 mins
7 Find K Closest Elements
Medium · 30 mins
Week 14 0 / 7
1 Longest Repeating Character Replacement
Medium · 30 mins
2 Inorder Successor in BST
Medium · 30 mins
3 Jump Game
Medium · 20 mins
4 Add Two Numbers
Medium · 25 mins
5 Generate Parentheses
Medium · 25 mins
6 Sort List
Medium · 25 mins
7 Number of Connected Components in an Undirected Graph
Medium · 30 mins
Week 15 0 / 7
1 Minimum Knight Moves
Medium · 35 mins
2 Subarray Sum Equals K
Medium · 35 mins
Asteroid Collision
3 Medium · 30 mins
4 Random Pick with Weight
Medium · 25 mins
5 Kth Largest Element in an Array
Medium · 30 mins
6 Maximal Square
Medium · 30 mins
7 Rotate Image
Medium · 25 mins
Week 16 0 / 7
1 Binary Tree Zigzag Level Order Traversal
Medium · 25 mins
2 Design Hit Counter
Medium · 30 mins
3 Path Sum III
Medium · 35 mins
4 Pow(x, n)
Medium · 20 mins
5 Search a 2D Matrix
Medium · 30 mins
6 Largest Number
Medium · 20 mins
7 Decode Ways
Medium · 25 mins
Week 17 0 / 7
1 Meeting Rooms II
Medium · 30 mins
2 Reverse Integer
Medium · 25 mins
3 Set Matrix Zeroes
Medium · 25 mins
4 Reorder List
Medium · 25 mins
5 Encode and Decode Strings
Medium · 25 mins
6 Cheapest Flights Within K Stops
Medium · 45 mins
7 All Nodes Distance K in Binary Tree
Medium · 25 mins
Week 18 0 / 6
1 3Sum Closest
Medium · 30 mins
2 Rotate List
Medium · 25 mins
3 Find Minimum in Rotated Sorted Array
Medium · 30 mins
4 Basic Calculator II
Medium · 30 mins
5 Minimum Window Substring
Hard · 30 mins
6 Serialize and Deserialize Binary Tree
Hard · 40 mins
Week 19 0 / 5
1 Trapping Rain Water
Hard · 35 mins
2 Find Median from Data Stream
Hard · 30 mins
3 Word Ladder
Hard · 45 mins
4 Basic Calculator
Hard · 40 mins
5 Maximum Profit in Job Scheduling
Hard · 45 mins
Week 20 0 / 13
1 Merge k Sorted Lists
Hard · 30 mins
2 Largest Rectangle in Histogram
Hard · 35 mins
3 Binary Tree Maximum Path Sum
Hard · 35 mins
4 Maximum Frequency Stack
Hard · 40 mins
5 Median of Two Sorted Arrays
Hard · 40 mins
6 Longest Increasing Path in a Matrix
Hard · 40 mins
7 Longest Valid Parentheses
Hard · 35 mins
Design In-Memory File System
8 Hard · 40 mins
9 Employee Free Time
Hard · 35 mins
10 Word Search II
Hard · 40 mins
11 Alien Dictionary
Hard · 45 mins
12 Bus Routes
Hard · 45 mins
13 Sliding Window Maximum
Hard · 35 mins
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