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README.md

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+---
+license: cc-by-nc-4.0
+language:
+- en
+task_categories:
+- text-generation
+- question-answering
+tags:
+- mathematics
+- olympiad
+- reasoning
+- benchmark
+- romanian
+- jbmo
+pretty_name: RoJBMO
+size_categories:
+- n<1K
+---
+
+# RoJBMO: Junior Balkan Mathematical Olympiad Benchmark
+
+RoJBMO is a benchmark of **508 competition mathematics problems** drawn from the Junior Balkan Mathematical Olympiad (JBMO), its official shortlists, and the Romanian Team Selection Tests (TST). It is designed to evaluate the mathematical reasoning capabilities of large language models on problems that are underrepresented in existing benchmarks and resistant to training data contamination.
+
+## Dataset Description
+
+- **Size**: 508 problems
+- **Language**: English
+- **Domains**: Algebra, Geometry, Combinatorics, Number Theory
+- **Years**: 2010–2025
+- **License**: CC BY-NC 4.0
+
+### Sources
+
+| Source | Problems | AoPS exposure |
+|--------|----------|---------------|
+| `jbmo` — Official JBMO competition problems | 60 | 95.0% |
+| `shl_jbmo` — JBMO official shortlist problems | 282 | 46.5% |
+| `tst_jbmo_ro` — Romanian Team Selection Test problems | 166 | 13.9% |
+
+The `tst_jbmo_ro` subset is the most contamination-resistant, with only 13.9% of problems findable via AoPS 5-gram search.
+
+## Dataset Structure
+
+Each row contains one problem with the following fields:
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `id` | int | Unique row index |
+| `problem_uid` | string | Unique problem identifier (e.g. `jbmo_2012_p3`) |
+| `problem_source` | string | Source category: `jbmo`, `shl_jbmo`, or `tst_jbmo_ro` |
+| `year` | int | Publication year (2010–2025) |
+| `type` | string | Domain code: `a` (Algebra), `g` (Geometry), `c` (Combinatorics), `n` (Number Theory) |
+| `type_label` | string | Full domain name |
+| `problem_num` | int | Problem number within the edition |
+| `statement` | string | Problem statement (LaTeX-formatted) |
+| `solution` | string | Official solution (LaTeX-formatted) |
+| `stmt_len` | int | Statement length in characters |
+| `sol_len` | int | Solution length in characters |