77 LeetCode Problems To Crack TikTok

Here are 77 LeetCode Problems I will solve to crack my TikTok interview.

And no, I won’t “grind 500 problems.”

I will focus on the right ones.

These are the exact problems I will practice right before my TikTok interview:

1/ Arrays & Hashing

1. Two Sum

2. Design HashMap

3. Insert Delete GetRandom O(1)

4. Spiral Matrix

5. Longest Consecutive Sequence

2/ Two Pointers

1. Longest Palindromic Substring

2. 3Sum

3. Sort Colors

4. Container With Most Water

5. Compare Version Numbers

6. Trapping Rain Water

3/ Stack

1. Valid Parentheses

2. Decode String

3. Basic Calculator II

4. Daily Temperatures

5. Asteroid Collision

6. Subarray With Elements Greater Than Varying Threshold

4/ Binary Search

1. Sqrt(x)

2. Longest Increasing Subsequence

3. Search in Rotated Sorted Array

4. Capacity To Ship Packages Within D Days

5. Maximum Value at a Given Index in a Bounded Array

6. Snapshot Array

7. Find Peak Element

5/ Sliding Window

1. Longest Substring Without Repeating Characters

2. Longest Substring with At Least K Repeating Characters

3. Count Complete Subarrays in an Array

4. Minimum Window Substring

5. Minimum Moves to Pick K Ones

6. Sliding Window Maximum

6/ Linked List

1. Reverse Linked List

2. Merge Two Sorted Lists

3. LRU Cache

4. Reorder List

5. Sort List

6. Reverse Nodes in k-Group

7/ Trees

1. Construct Binary Tree from Preorder and Inorder Traversal

2. Number of Good Leaf Nodes Pairs

3. Binary Tree Right Side View

4. Lowest Common Ancestor of a Binary Tree

5. Binary Tree Maximum Path Sum

6. Serialize and Deserialize Binary Tree

8/ Trie

1. Longest Common Prefix

2. Word Break

3. Design Add And Search Words Data Structure

4. Word Search II

9/ Backtracking

1. Word Search

2. Restore IP Addresses

3. Generate Parentheses

4. Combination Sum

5. N-Queens

6. Word Break II

10/ Heap (Priority Queue)

1. Kth Largest Element in an Array

2. Top K Frequent Elements

3. Reorganize String

4. Longest Happy String

5. Merge k Sorted Lists

6. Meeting Rooms III

11/ Graphs

1. Number of Islands

2. Course Schedule II

3. Course Schedule

4. Max Area of Island

5. Making A Large Island

6. Word Ladder

12/ Intervals

1. Insert Interval

2. Merge Intervals

3. Non-overlapping Intervals

13/ Greedy & Dynamic Programming

1. Best Time to Buy and Sell Stock

2. Coin Change

3. House Robber

4. Maximum Swap

14/ Prefix Sum

1. Subarray Sum Equals K

2. Count the Hidden Sequences

3. Find the Score of All Prefixes of an Array

15/ Miscellaneous

1. Longest Increasing Path in a Matrix

2. Bus Routes

3. Shortest Path in a Grid with Obstacles Elimination

If you’re preparing for FAANG in 2026, don’t forget to save this post.

Also, here’s a platform which you can use to practice for your interviews:

🔗 Interview Roadmap Platform: Link

Best of luck!