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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.

top-specifictiktok-prep
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383
Top K Frequent Words
Medium
Jump Game II
Medium
Valid Parentheses6 Months
Easy
Max Stack
Hard
Word Ladder II
Hard
Insert Delete GetRandom O(1) - Duplicates allowed
Hard
Number of Connected Components in an Undirected Graph
Medium
Kth Smallest Element in a Sorted Matrix
Medium
Maximum Spending After Buying Items
Hard
Reformat Date
Easy
Shortest Distance from All Buildings
Hard
Open the Lock
Medium
Snapshot Array6 Months
Medium
Validate IP Address
Medium
Meeting Rooms II3 Months
Medium
Find the Length of the Longest Common Prefix
Medium
Design HashMap6 Months
Easy
Asteroid Collision6 Months
Medium
Graph Valid Tree
Medium
Verify Preorder Sequence in Binary Search Tree
Medium
Furthest Building You Can Reach
Medium
Unique Binary Search Trees
Medium
Longest Happy String
Medium
Process Tasks Using Servers
Medium
Reverse Linked List6 Months
Easy
Design Tic-Tac-Toe
Medium
Spiral Matrix6 Months
Medium
Make Array Non-decreasing or Non-increasing
Hard
Minimum Difficulty of a Job Schedule
Hard
Pacific Atlantic Water Flow
Medium
Letter Case Permutation
Medium
Course Schedule II6 Months
Medium
Next Permutation
Medium
Time Based Key-Value Store
Medium
Subarray With Elements Greater Than Varying Threshold
Hard
Maximum Product Subarray
Medium
Count the Hidden Sequences
Medium
Event Emitter
Medium
Minimum Operations to Write the Letter Y on a Grid6 Months
Medium
Serialize and Deserialize Binary Tree6 Months
Hard
Encode and Decode Strings6 Months
Medium
Pow(x, n)
Medium
All Nodes Distance K in Binary Tree
Medium
Longest Substring Without Repeating Characters3 Months
Medium
Alien Dictionary
Hard
Generate Parentheses6 Months
Medium
Copy List with Random Pointer
Medium
Verifying an Alien Dictionary
Easy
Diameter of Binary Tree
Easy
Find K Closest Elements
Medium
Nth Highest Salary
Medium
Longest String Chain
Medium
Minimum Cost For Tickets
Medium
Climbing Stairs6 Months
Easy
Car Pooling
Medium
Compare Version Numbers
Medium
Merge Intervals6 Months
Medium
Longest Palindromic Substring3 Months
Medium
Search Suggestions System
Medium
Peeking Iterator
Medium
Koko Eating Bananas
Medium
Product of Array Except Self
Medium
Kth Smallest Element in a BST
Medium
Trapping Rain Water
Hard
Parallel Courses III
Hard
Basic Calculator III6 Months
Hard
Number of Visible People in a Queue
Hard
Minimum Swaps to Group All 1's Together
Medium
Minimum Window Substring6 Months
Hard
Maximum Swap
Medium
Task Scheduler
Medium
Longest Repeating Character Replacement
Medium
Basic Calculator II
Medium
Random Pick with Weight
Medium
Number of Adjacent Elements With the Same Color6 Months
Medium
Find All Anagrams in a String
Medium
House Robber III
Medium
Maximum Profit in Job Scheduling
Hard
Permutation in String
Medium
Longest Increasing Path in a Matrix
Hard
Valid Palindrome II
Easy
Regular Expression Matching
Hard
Largest Number6 Months
Medium
My Calendar I
Medium
Daily Temperatures3 Months
Medium
Wildcard Matching
Hard
Valid Sudoku
Medium
First Missing Positive
Hard
Sqrt(x)
Easy
Capacity To Ship Packages Within D Days
Medium
Unique Paths II
Medium
Maximum Width Ramp
Medium
Isomorphic Strings
Easy
Merge Sorted Array
Easy
Move Zeroes6 Months
Easy
Making A Large Island3 Months
Hard
Permutations
Medium
Maximal Square
Medium
Maximum Value at a Given Index in a Bounded Array
Medium
Heaters
Medium
Find All Possible Recipes from Given Supplies6 Months
Medium
Non-overlapping Intervals
Medium
Most Popular Video Creator
Medium
Minimum Moves to Pick K Ones
Hard
Maximum Subarray
Medium
Lexicographically Smallest Generated String
Hard
Intersection of Two Linked Lists
Easy
LRU Cache30 Days
Medium
Minimum Operations to Make Character Frequencies Equal
Hard
Shortest Bridge
Medium
Robot Bounded In Circle
Medium
Container With Most Water6 Months
Medium
Basic Calculator6 Months
Hard
Insert Delete GetRandom O(1)
Medium
String Compression
Medium
Rotting Oranges6 Months
Medium
Two Sum II - Input Array Is Sorted
Medium
Minimum Cost Good Caption
Hard
Frog Jump
Hard
Longest Common Prefix
Easy
Number of Islands3 Months
Medium
Length of the Longest Alphabetical Continuous Substring
Medium
Longest Common Subsequence6 Months
Medium
Find the Score of All Prefixes of an Array
Medium
Reverse Words in a String6 Months
Medium
Combination Sum
Medium
Path With Minimum Effort
Medium
Word Search II6 Months
Hard
Roman to Integer
Easy
Shortest Path in Binary Matrix6 Months
Medium
Longest Valid Parentheses6 Months
Hard
Snakes and Ladders
Medium
Count Binary Substrings
Easy
Decode String6 Months
Medium
Search in Rotated Sorted Array3 Months
Medium
Design In-Memory File System
Hard
Rearrange String k Distance Apart
Hard
Course Schedule3 Months
Medium
LFU Cache
Hard
Remove K Digits
Medium
Search a 2D Matrix II
Medium
Minimum Increment to Make Array Unique
Medium
Bus Routes
Hard
Incremental Memory Leak
Medium
Count Complete Subarrays in an Array
Medium
Edit Distance6 Months
Medium
The Skyline Problem
Hard
Walls and Gates
Medium
Insert Interval6 Months
Medium
Split Message Based on Limit6 Months
Hard
Word Ladder6 Months
Hard
Restore IP Addresses
Medium
Closest Prime Numbers in Range
Medium
Two Sum6 Months
Easy
Parallel Courses
Medium
Find All Duplicates in an Array
Medium
Design Add and Search Words Data Structure
Medium
Replace Words
Medium
Merge Two Sorted Lists
Easy
Median of Two Sorted Arrays
Hard
Subarray Sum Equals K6 Months
Medium
Pairs of Songs With Total Durations Divisible by 60
Medium
Word Pattern II
Medium
Top K Frequent Elements
Medium
Reorder List6 Months
Medium
Diagonal Traverse
Medium
Best Time to Buy and Sell Stock
Easy
Lowest Common Ancestor of a Binary Tree
Medium
Multiply Strings
Medium
Reverse Nodes in k-Group
Hard
Convert Binary Search Tree to Sorted Doubly Linked List6 Months
Medium
Group Anagrams6 Months
Medium
Find the Duplicate Number
Medium
N-Queens
Hard
Super Egg Drop3 Months
Hard
Word Search6 Months
Medium
Course Schedule IV6 Months
Medium
Sort Colors
Medium
The Maze II
Medium
Network Delay Time
Medium
Symmetric Tree
Easy
Binary Tree Right Side View
Medium
Permutations II
Medium
Sum of Subarray Minimums6 Months
Medium
Maximal Rectangle
Hard
Remove Invalid Parentheses
Hard
Valid Palindrome
Easy
Integer to Roman
Medium
Decode Ways
Medium
Candy Crush
Medium
Minimum Path Sum
Medium
Evaluate Division6 Months
Medium
Max Consecutive Ones III
Medium
Score of Parentheses
Medium
Simplify Path6 Months
Medium
Implement Trie (Prefix Tree)
Medium
Greatest Common Divisor of Strings
Easy
Regions Cut By Slashes
Medium
Minimum Remove to Make Valid Parentheses6 Months
Medium
3Sum6 Months
Medium
Largest Rectangle in Histogram3 Months
Hard
Jump Game30 Days
Medium
Rotate Array6 Months
Medium
Shortest Palindrome
Hard
Contiguous Array
Medium
Word Break II
Hard
Flatten Deeply Nested Array
Medium
Letter Combinations of a Phone Number
Medium
Best Time to Buy and Sell Stock II6 Months
Medium
Merge k Sorted Lists3 Months
Hard
Gas Station
Medium
Subarrays with K Different Integers
Hard
Longest Substring with At Most Two Distinct Characters
Medium
Remove All Adjacent Duplicates in String II
Medium
Number of Good Leaf Nodes Pairs
Medium
Longest Substring with At Most K Distinct Characters
Medium
Valid Anagram
Easy
Add Two Numbers
Medium
Partition Equal Subset Sum
Medium
Binary Tree Maximum Path Sum6 Months
Hard
Minimum Obstacle Removal to Reach Corner
Hard
Count Number of Nice Subarrays
Medium
Best Time to Buy and Sell Stock III6 Months
Hard
Fraction to Recurring Decimal
Medium
Expression Add Operators
Hard
Sort List
Medium
Shortest Unsorted Continuous Subarray6 Months
Medium
Remove Duplicate Letters6 Months
Medium
Meeting Rooms III
Hard
Vertical Order Traversal of a Binary Tree
Hard
Next Greater Element I6 Months
Easy
Sliding Window Maximum
Hard
Add Two Integers
Easy
Find Median from Data Stream
Hard
House Robber II6 Months
Medium
Add Bold Tag in String
Medium
Add Two Numbers II
Medium
Is Subsequence
Easy
Minimum Time Difference
Medium
Implement Queue using Stacks
Easy
Reorganize String
Medium
Combinations
Medium
Longest Consecutive Sequence6 Months
Medium
Word Break
Medium
Minimum Size Subarray Sum
Medium
Find Minimum in Rotated Sorted Array
Medium
3Sum Smaller
Medium
Happy Number
Easy
Sentence Similarity III
Medium
Make Costs of Paths Equal in a Binary Tree
Medium
Coin Change II
Medium
Water and Jug Problem
Medium
Next Greater Element III
Medium
Stickers to Spell Word
Hard
Number of Islands II
Hard
Unique Paths
Medium
Design Memory Allocator6 Months
Medium
Sort Characters By Frequency
Medium
Merge Operations to Turn Array Into a Palindrome
Medium
Brightest Position on Street6 Months
Medium
Longest Duplicate Substring6 Months
Hard
House Robber6 Months
Medium
Number of Longest Increasing Subsequence
Medium
Smallest Common Region
Medium
Numbers At Most N Given Digit Set
Hard
Spiral Matrix II
Medium
Number of Atoms
Hard
Min Cost to Connect All Points
Medium
Consecutive Numbers Sum
Hard
Number of Distinct Islands6 Months
Medium
Champagne Tower6 Months
Medium
Tree Diameter
Medium
Dot Product of Two Sparse Vectors
Medium
132 Pattern
Medium
Maximum Product of Three Numbers
Easy
Maximum Points You Can Obtain from Cards
Medium
Plus One
Easy
Deepest Leaves Sum
Medium
Convert Sorted Array to Binary Search Tree
Easy
Add Strings
Easy
Reorder Routes to Make All Paths Lead to the City Zero
Medium
Valid Word Abbreviation
Easy
Minimum Moves to Spread Stones Over Grid
Medium
Delete and Earn
Medium
Remove Nth Node From End of List
Medium
Find Peak Element
Medium
Flip String to Monotone Increasing
Medium
Longest Increasing Subsequence3 Months
Medium
Is Graph Bipartite?
Medium
Max Area of Island
Medium
Count the Number of Good Subarrays
Medium
Find First and Last Position of Element in Sorted Array
Medium
Binary Tree Zigzag Level Order Traversal
Medium
Count Pairs Of Similar Strings
Easy
Binary Tree Longest Consecutive Sequence3 Months
Medium
Combination Sum II
Medium
Candy
Hard
Best Time to Buy and Sell Stock with Cooldown
Medium
Maximum Number of Events That Can Be Attended
Medium
Next Greater Element II
Medium
01 Matrix
Medium
Subsets
Medium
Best Time to Buy and Sell Stock with Transaction Fee
Medium
Step-By-Step Directions From a Binary Tree Node to Another
Medium
Length of Longest Subarray With at Most K Frequency
Medium
Coin Change6 Months
Medium
Kth Largest Element in an Array6 Months
Medium
Path Sum II6 Months
Medium
Best Time to Buy and Sell Stock IV
Hard
Reverse Linked List II
Medium
Minimum Number of Arrows to Burst Balloons
Medium
Distinct Subsequences
Hard
Random Pick Index
Medium
Concatenated Words
Hard
Cousins in Binary Tree
Easy
Longest Mountain in Array3 Months
Medium
Text Justification3 Months
Hard
Sum of Subarray Ranges
Medium
Maximum Performance of a Team
Hard
Parallel Courses II
Hard
Subarray Sums Divisible by K6 Months
Medium
Wiggle Sort
Medium
Nth Digit6 Months
Medium
Valid Parenthesis String6 Months
Medium
Integer Break
Medium
Meeting Rooms6 Months
Easy
Shortest Path in a Grid with Obstacles Elimination
Hard
Most Stones Removed with Same Row or Column
Medium
Kth Missing Positive Number
Easy
Construct String from Binary Tree
Medium
Search a 2D Matrix
Medium
Construct Binary Tree from Preorder and Inorder Traversal6 Months
Medium
Maximal Score After Applying K Operations
Medium
Find Maximum Non-decreasing Array Length
Hard
Longest Substring with At Least K Repeating Characters
Medium
Employee Free Time
Hard
Valid Square
Medium
Minimum Number of Operations to Move All Balls to Each Box
Medium
Minimum Swaps to Group All 1's Together II
Medium
Design Search Autocomplete System
Hard
Remove Duplicates from Sorted List II
Medium
Binary Tree Vertical Order Traversal
Medium
Path Sum IV
Medium
Find Positive Integer Solution for a Given Equation
Medium
Possible Bipartition6 Months
Medium
Range Frequency Queries
Medium
24 Game6 Months
Hard
Buildings With an Ocean View
Medium
Most Profit Assigning Work
Medium
Robot Room Cleaner6 Months
Hard
Remove Duplicates from Sorted Array II
Medium
Lexicographically Smallest Palindrome
Easy
Invert Binary Tree
Easy
Combination Sum IV
Medium
Merge In Between Linked Lists
Medium
Human Traffic of Stadium
Hard
Valid Tic-Tac-Toe State
Medium
Accounts Merge
Medium
Increasing Triplet Subsequence
Medium
Minesweeper
Medium
Largest BST Subtree
Medium
Recover Binary Search Tree
Medium
K-th Smallest in Lexicographical Order
Hard
Maximum Frequency Stack
Hard
Valid Palindrome III
Hard
Maximum Width of Binary Tree
Medium
Minimize Malware Spread
Hard
Minimum Insertions to Balance a Parentheses String
Medium
Minimum Operations to Make the Array Increasing
Easy
2 Keys Keyboard
Medium
Sparse Matrix Multiplication
Medium
Find the Celebrity
Medium
Valid Mountain Array
Easy
Shortest Subarray to be Removed to Make Array Sorted
Medium
Insert into a Sorted Circular Linked List
Medium
Swap Nodes in Pairs
Medium
Matchsticks to Square
Medium
Put Marbles in Bags
Hard
Path Sum
Easy
Maximum Size Subarray Sum Equals k
Medium
H-Index
Medium
Rearranging Fruits
Hard
Arithmetic Slices
Medium