Toph hosts competitive programming contests and problems on algorithms and data structures, with a community for participants.
CSES Problemset
vsAtCoder
CSES Problemset vs AtCoder
How do CSES Problemset and AtCoder compare? Here are the facts side by side: pricing, platforms, open-source status and what each one is for.
| Directory detail | CSES Problemset | AtCoder |
|---|---|---|
| What it is | CSES Problem Set provides programming tasks for practice, with problem categories, statistics, and account features. | AtCoder hosts online programming contests, including beginner and heuristic contests, with practice contests for new users. |
| Website | ||
| Type | Website | Website |
| Topic | ||
| Pricing | Not confirmed | Not confirmed |
| Platforms | Web | Web |
| Open source | Not stated | Not stated |
| Language | — | — |
| Alternatives |
Other options to consider
Sites similar to both CSES Problemset and AtCoder.
CodeAbbey offers programming problems for practice, with recent challenges and a programming certificate.
NeetCode offers coding interview practice through courses, assessments, head-to-head mode, and a catalog of programming problems.
Codewars offers community-created coding exercises called kata, with practice across more than 55 programming languages.
Rosetta Code presents solutions to the same programming tasks in multiple languages for comparison.
30 Seconds of Code offers hundreds of short coding articles to help readers practice programming skills.






