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GOOGLE · CODING QUESTIONS

Google coding interview questions

The data structures and algorithms questions candidates report from Google interviews, linked to AlgoRung problems with an editor, hidden tests, an animated walkthrough and solutions in four languages. Most asked topics: Graphs, Trees & BST, Dynamic Programming, Tries.

From public candidate reports and Google's careers pages, checked November 2026. Processes vary by team. AlgoRung is not affiliated with Google.

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All 12 reported Google coding questions

Difficulty
Topic
12 questions
  1. Implement Trie (Prefix Tree) Medium Tries
  2. Decode String Medium Stack also Microsoft
  3. Minimum Window Substring Hard Arrays & Hashing also Meta, LinkedIn, Oracle
  4. Word Ladder Hard Graphs also Amazon, LinkedIn
  5. Binary Tree Maximum Path Sum Hard Trees & BST also Amazon, Adobe
  6. Lowest Common Ancestor of a Binary Tree Medium Trees & BST also Meta, Netflix, Atlassian +1
  7. Course Schedule Medium Graphs also Amazon, Netflix, Uber +1
  8. Cheapest Flights Within K Stops Medium Graphs also Airbnb, Flipkart, Swiggy
  9. Longest Common Subsequence Medium Dynamic Programming
  10. Coin Change Medium Dynamic Programming also Airbnb, Goldman Sachs, Salesforce
  11. Maximal Square Medium Dynamic Programming
  12. Evaluate Reverse Polish Notation Medium Stack
Also reported, not on AlgoRung yet (13)

Snapshot Array · Minimum Domino Rotations For Equal Row · Long Pressed Name · Expressive Words · Text Justification · Robot Room Cleaner · Longest Increasing Path in a Matrix · Non-overlapping Intervals · Maximal Rectangle · Race Car · Strobogrammatic Number II · Best Meeting Point · Confusing Number II

How the coding round is scored · The online assessment

Questions people ask

What coding questions does Google ask?

Candidates most often report Implement Trie (Prefix Tree), Decode String, Minimum Window Substring, Word Ladder, Binary Tree Maximum Path Sum. The full list of 12 reported questions is on this page, each linked to a practice problem with solutions.

Which topics should I study for the Google coding interview?

graphs, trees, tries, dynamic programming, arrays and strings, heaps. A 45 to 60 minute live interview where you solve one or two data-structures-and-algorithms problems while explaining your thinking. Interviewers score problem solving, code quality, testing and communication.

How hard are Google coding questions?

Of the reported questions on AlgoRung, 0 are easy, 9 medium and 3 hard. Expect mostly medium problems, with follow-ups that change a constraint.

Coding questions at other companies

Coding questions across all companies · Behavioral questions