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Tiktok Master DSA Sheet

This compilation contains exclusive, previously asked data structure and algorithm questions from real Tiktok interviews. Focus on these core problem patterns to confidently tackle even the hardest interview challenges.

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Top K Frequent Words
Jump Game II
Valid Parentheses6 Months
Max Stack
Word Ladder II
Insert Delete GetRandom O(1) - Duplicates allowed
Number of Connected Components in an Undirected Graph
Kth Smallest Element in a Sorted Matrix
Maximum Spending After Buying Items
Reformat Date
Shortest Distance from All Buildings
Open the Lock
Snapshot Array6 Months
Validate IP Address
Meeting Rooms II3 Months
Find the Length of the Longest Common Prefix
Design HashMap6 Months
Asteroid Collision6 Months
Graph Valid Tree
Verify Preorder Sequence in Binary Search Tree
Furthest Building You Can Reach
Unique Binary Search Trees
Longest Happy String
Process Tasks Using Servers
Reverse Linked List6 Months
Design Tic-Tac-Toe
Spiral Matrix6 Months
Make Array Non-decreasing or Non-increasing
Minimum Difficulty of a Job Schedule
Pacific Atlantic Water Flow
Letter Case Permutation
Course Schedule II6 Months
Next Permutation
Time Based Key-Value Store
Subarray With Elements Greater Than Varying Threshold
Maximum Product Subarray
Count the Hidden Sequences
Event Emitter
Minimum Operations to Write the Letter Y on a Grid6 Months
Serialize and Deserialize Binary Tree6 Months
Encode and Decode Strings6 Months
Pow(x, n)
All Nodes Distance K in Binary Tree
Longest Substring Without Repeating Characters3 Months
Alien Dictionary
Generate Parentheses6 Months
Copy List with Random Pointer
Verifying an Alien Dictionary
Diameter of Binary Tree
Find K Closest Elements
Nth Highest Salary
Longest String Chain
Minimum Cost For Tickets
Climbing Stairs6 Months
Car Pooling
Compare Version Numbers
Merge Intervals6 Months
Longest Palindromic Substring3 Months
Search Suggestions System
Peeking Iterator
Koko Eating Bananas
Product of Array Except Self
Kth Smallest Element in a BST
Trapping Rain Water
Parallel Courses III
Basic Calculator III6 Months
Number of Visible People in a Queue
Minimum Swaps to Group All 1's Together
Minimum Window Substring6 Months
Maximum Swap
Task Scheduler
Longest Repeating Character Replacement
Basic Calculator II
Random Pick with Weight
Number of Adjacent Elements With the Same Color6 Months
Find All Anagrams in a String
House Robber III
Maximum Profit in Job Scheduling
Permutation in String
Longest Increasing Path in a Matrix
Valid Palindrome II
Regular Expression Matching
Largest Number6 Months
My Calendar I
Daily Temperatures3 Months
Wildcard Matching
Valid Sudoku
First Missing Positive
Sqrt(x)
Capacity To Ship Packages Within D Days
Unique Paths II
Maximum Width Ramp
Isomorphic Strings
Merge Sorted Array
Move Zeroes6 Months
Making A Large Island3 Months
Permutations
Maximal Square
Maximum Value at a Given Index in a Bounded Array
Heaters
Find All Possible Recipes from Given Supplies6 Months
Non-overlapping Intervals
Most Popular Video Creator
Minimum Moves to Pick K Ones
Maximum Subarray
Lexicographically Smallest Generated String
Intersection of Two Linked Lists
LRU Cache30 Days
Minimum Operations to Make Character Frequencies Equal
Shortest Bridge
Robot Bounded In Circle
Container With Most Water6 Months
Basic Calculator6 Months
Insert Delete GetRandom O(1)
String Compression
Rotting Oranges6 Months
Two Sum II - Input Array Is Sorted
Minimum Cost Good Caption
Frog Jump
Longest Common Prefix
Number of Islands3 Months
Length of the Longest Alphabetical Continuous Substring
Longest Common Subsequence6 Months
Find the Score of All Prefixes of an Array
Reverse Words in a String6 Months
Combination Sum
Path With Minimum Effort
Word Search II6 Months
Roman to Integer
Shortest Path in Binary Matrix6 Months
Longest Valid Parentheses6 Months
Snakes and Ladders
Count Binary Substrings
Decode String6 Months
Search in Rotated Sorted Array3 Months
Design In-Memory File System
Rearrange String k Distance Apart
Course Schedule3 Months
LFU Cache
Remove K Digits
Search a 2D Matrix II
Minimum Increment to Make Array Unique
Bus Routes
Incremental Memory Leak
Count Complete Subarrays in an Array
Edit Distance6 Months
The Skyline Problem
Walls and Gates
Insert Interval6 Months
Split Message Based on Limit6 Months
Word Ladder6 Months
Restore IP Addresses
Closest Prime Numbers in Range
Two Sum6 Months
Parallel Courses
Find All Duplicates in an Array
Design Add and Search Words Data Structure
Replace Words
Merge Two Sorted Lists
Median of Two Sorted Arrays
Subarray Sum Equals K6 Months
Pairs of Songs With Total Durations Divisible by 60
Word Pattern II
Top K Frequent Elements
Reorder List6 Months
Diagonal Traverse
Best Time to Buy and Sell Stock
Lowest Common Ancestor of a Binary Tree
Multiply Strings
Reverse Nodes in k-Group
Convert Binary Search Tree to Sorted Doubly Linked List6 Months
Group Anagrams6 Months
Find the Duplicate Number
N-Queens
Super Egg Drop3 Months
Word Search6 Months
Course Schedule IV6 Months
Sort Colors
The Maze II
Network Delay Time
Symmetric Tree
Binary Tree Right Side View
Permutations II
Sum of Subarray Minimums6 Months
Maximal Rectangle
Remove Invalid Parentheses
Valid Palindrome
Integer to Roman
Decode Ways
Candy Crush
Minimum Path Sum
Evaluate Division6 Months
Max Consecutive Ones III
Score of Parentheses
Simplify Path6 Months
Implement Trie (Prefix Tree)
Greatest Common Divisor of Strings
Regions Cut By Slashes
Minimum Remove to Make Valid Parentheses6 Months
3Sum6 Months
Largest Rectangle in Histogram3 Months
Jump Game30 Days
Rotate Array6 Months
Shortest Palindrome
Contiguous Array
Word Break II
Flatten Deeply Nested Array
Letter Combinations of a Phone Number
Best Time to Buy and Sell Stock II6 Months
Merge k Sorted Lists3 Months
Gas Station
Subarrays with K Different Integers
Longest Substring with At Most Two Distinct Characters
Remove All Adjacent Duplicates in String II
Number of Good Leaf Nodes Pairs
Longest Substring with At Most K Distinct Characters
Valid Anagram
Add Two Numbers
Partition Equal Subset Sum
Binary Tree Maximum Path Sum6 Months
Minimum Obstacle Removal to Reach Corner
Count Number of Nice Subarrays
Best Time to Buy and Sell Stock III6 Months
Fraction to Recurring Decimal
Expression Add Operators
Sort List
Shortest Unsorted Continuous Subarray6 Months
Remove Duplicate Letters6 Months
Meeting Rooms III
Vertical Order Traversal of a Binary Tree
Next Greater Element I6 Months
Sliding Window Maximum
Add Two Integers
Find Median from Data Stream
House Robber II6 Months
Add Bold Tag in String
Add Two Numbers II
Is Subsequence
Minimum Time Difference
Implement Queue using Stacks
Reorganize String
Combinations
Longest Consecutive Sequence6 Months
Word Break
Minimum Size Subarray Sum
Find Minimum in Rotated Sorted Array
3Sum Smaller
Happy Number
Sentence Similarity III
Make Costs of Paths Equal in a Binary Tree
Coin Change II
Water and Jug Problem
Next Greater Element III
Stickers to Spell Word
Number of Islands II
Unique Paths
Design Memory Allocator6 Months
Sort Characters By Frequency
Merge Operations to Turn Array Into a Palindrome
Brightest Position on Street6 Months
Longest Duplicate Substring6 Months
House Robber6 Months
Number of Longest Increasing Subsequence
Smallest Common Region
Numbers At Most N Given Digit Set
Spiral Matrix II
Number of Atoms
Min Cost to Connect All Points
Consecutive Numbers Sum
Number of Distinct Islands6 Months
Champagne Tower6 Months
Tree Diameter
Dot Product of Two Sparse Vectors
132 Pattern
Maximum Product of Three Numbers
Maximum Points You Can Obtain from Cards
Plus One
Deepest Leaves Sum
Convert Sorted Array to Binary Search Tree
Add Strings
Reorder Routes to Make All Paths Lead to the City Zero
Valid Word Abbreviation
Minimum Moves to Spread Stones Over Grid
Delete and Earn
Remove Nth Node From End of List
Find Peak Element
Flip String to Monotone Increasing
Longest Increasing Subsequence3 Months
Is Graph Bipartite?
Max Area of Island
Count the Number of Good Subarrays
Find First and Last Position of Element in Sorted Array
Binary Tree Zigzag Level Order Traversal
Count Pairs Of Similar Strings
Binary Tree Longest Consecutive Sequence3 Months
Combination Sum II
Candy
Best Time to Buy and Sell Stock with Cooldown
Maximum Number of Events That Can Be Attended
Next Greater Element II
01 Matrix
Subsets
Best Time to Buy and Sell Stock with Transaction Fee
Step-By-Step Directions From a Binary Tree Node to Another
Length of Longest Subarray With at Most K Frequency
Coin Change6 Months
Kth Largest Element in an Array6 Months
Path Sum II6 Months
Best Time to Buy and Sell Stock IV
Reverse Linked List II
Minimum Number of Arrows to Burst Balloons
Distinct Subsequences
Random Pick Index
Concatenated Words
Cousins in Binary Tree
Longest Mountain in Array3 Months
Text Justification3 Months
Sum of Subarray Ranges
Maximum Performance of a Team
Parallel Courses II
Subarray Sums Divisible by K6 Months
Wiggle Sort
Nth Digit6 Months
Valid Parenthesis String6 Months
Integer Break
Meeting Rooms6 Months
Shortest Path in a Grid with Obstacles Elimination
Most Stones Removed with Same Row or Column
Kth Missing Positive Number
Construct String from Binary Tree
Search a 2D Matrix
Construct Binary Tree from Preorder and Inorder Traversal6 Months
Maximal Score After Applying K Operations
Find Maximum Non-decreasing Array Length
Longest Substring with At Least K Repeating Characters
Employee Free Time
Valid Square
Minimum Number of Operations to Move All Balls to Each Box
Minimum Swaps to Group All 1's Together II
Design Search Autocomplete System
Remove Duplicates from Sorted List II
Binary Tree Vertical Order Traversal
Path Sum IV
Find Positive Integer Solution for a Given Equation
Possible Bipartition6 Months
Range Frequency Queries
24 Game6 Months
Buildings With an Ocean View
Most Profit Assigning Work
Robot Room Cleaner6 Months
Remove Duplicates from Sorted Array II
Lexicographically Smallest Palindrome
Invert Binary Tree
Combination Sum IV
Merge In Between Linked Lists
Human Traffic of Stadium
Valid Tic-Tac-Toe State
Accounts Merge
Increasing Triplet Subsequence
Minesweeper
Largest BST Subtree
Recover Binary Search Tree
K-th Smallest in Lexicographical Order
Maximum Frequency Stack
Valid Palindrome III
Maximum Width of Binary Tree
Minimize Malware Spread
Minimum Insertions to Balance a Parentheses String
Minimum Operations to Make the Array Increasing
2 Keys Keyboard
Sparse Matrix Multiplication
Find the Celebrity
Valid Mountain Array
Shortest Subarray to be Removed to Make Array Sorted
Insert into a Sorted Circular Linked List
Swap Nodes in Pairs
Matchsticks to Square
Put Marbles in Bags
Path Sum
Maximum Size Subarray Sum Equals k
H-Index
Rearranging Fruits
Arithmetic Slices