TikTok

The 35 TikTok interview problems asked most — recent (last six months) first, then all-time frequency — grouped by pattern.

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Arrays & Hashing

Sliding Window

Best Time to Buy and Sell Stock↻Easy
Fruit Into Baskets↻Medium

Stack

Basic Calculator II↻Medium

Binary Search

Search In Rotated Sorted Array↻Medium
Find First and Last Position of Element in Sorted Array↻Medium

Linked List

LRU Cache↻Medium
Reverse Nodes in K Group↻Hard

Heap / Priority Queue

Kth Largest Element In An Array↻Medium
Find Median From Data Stream↻Hard

Backtracking

Word Search↻Medium
Subsets↻Medium

Graphs

Number of Islands↻Medium
Course Schedule↻Medium

Advanced Graphs

Cheapest Flights Within K Stops↻Medium

Greedy

Gas Station↻Medium

Intervals

Meeting Rooms II↻Medium
Merge Intervals↻Medium

Math & Geometry

Spiral Matrix↻Medium