Uber

The 40 Uber interview problems asked most — recent (last six months) first, then all-time frequency — grouped by pattern.

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Arrays & Hashing

Insert Delete GetRandom O(1)↻Medium

Sliding Window

Design Hit Counter↻Medium

Binary Search

Split Array Largest Sum↻Hard
Time Based Key Value Store↻Medium

Linked List

LRU Cache↻Medium

Trees

Kth Smallest Element In a Bst↻Medium
Serialize And Deserialize Binary Tree↻Hard

Tries

Word Search II↻Hard

Heap / Priority Queue

Find Median From Data Stream↻Hard

Backtracking

Word Search↻Medium

Graphs

Advanced Graphs

Alien Dictionary↻Hard

1-D DP

Longest Palindromic Substring↻Medium

Intervals

Meeting Rooms II↻Medium
Merge Intervals↻Medium

Strings

Roman to Integer↻Easy