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What free alternatives are there to paid platforms like LeetCode for practicing data structures and algorithms before a technical screen next week?
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Fan-out diagram
The searches the AI actually ran for this prompt.
SEED QUERY
What free alternatives are there to paid platforms like LeetCode for practicing data structures and algorithms before a technical screen next week?
1 real search · 1 real-search pass
best free LeetCode alternatives coding interview practice HackerRank Codewars CSES NeetCode free 2026Google ↗
OBSERVEDComparison
Badge and edge weight = share of passes that produced the query. Hover a query for its intent and routing format.
Query classes
Google's semantic query class for every sub-query: what kind of answer each search is after, simulated vs real.
ChatGPT real searches (1)
Classes come from the query-classifier (a local Laya model).
Searches and sources
ChatGPT1 real searches · gpt-6
best free LeetCode alternatives coding interview practice HackerRank Codewars CSES NeetCode free 2026 Google ↗
- NeetCode · neetcode.io
- HackerRank Algorithms · hackerrank.com
- Codewars · codewars.com
- Exercism · exercism.org
- CSES Problem Set · cses.fi
- Codeforces · codeforces.com
- Best Coding Practice Websites in 2026: 12 Free Platforms · masaischool.com
- Software engineer interview preparation: free resources · helpwing.dev
- 10 Best Free Coding Practice Sites (2026) · qaynaq.com