LinkedIn

The 35 LinkedIn 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

Longest Substring Without Repeating Characters↻Medium

Stack

Valid Parentheses↻Easy

Binary Search

Search In Rotated Sorted Array↻Medium

Linked List

LRU Cache↻Medium

Trees

Maximum Depth of Binary Tree↻Easy

Heap / Priority Queue

Kth Largest Element In An Array↻Medium

Backtracking

Letter Combinations of a Phone Number↻Medium
Permutations↻Medium

Graphs

1-D DP

Maximum Product Subarray↻Medium

Greedy

Maximum Subarray↻Medium

Intervals

Merge Intervals↻Medium