Duolingo OA questions,
16 reported by real candidates.

Every Duolingo online assessment question candidates have reported, most recent April 2026. The pattern that shows up most: sorting.

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April 2026 (3)

Return Every Matching Decryption

Rank Word-Translation Hints from Sentence Translations

Encrypt and Decrypt Strings

November 2025 (2)

breadth first search

Longest Decreasing Matrix Path with Limited Relaxations

dynamic programming

Validate a Mahjong Hand Partition

October 2025 (3)

Collect Sticks for a Bird's Nest

Dynamic Pair Sum Queries

dynamic programming

Longest Border-Ending Diagonal Pattern

December 2024 (1)

Bouncing Square Reaches a Screen Corner

October 2022 (3)

Most-Read Page Across Every Valid Storyline

Directional Tiles: Find a Valid Reconfiguration Path

Visit Desired Attractions Without Reusing a Trail

September 2022 (2)

breadth first search

Shortest Route Through a Traced Maze

Rank Common Translation Mistakes

September 2021 (2)

Count Distinct Word Meanings

Count Legal Outfit Combinations

⏵ Beyond the OA

Duolingo also has 4 LeetCode problems reported from its interviews, with the topics it leans on most.

⏵ The honest play

You've seen Duolingo's questions.
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