Update README.md

README.md

@@ -23,3 +23,18 @@ Each problem in the JSON file contains:
 
 Data was collected from the official USACO contest platform `https://usaco.org//index.php?page=open25results`, copyright not specified.
 
+### Citation
+
+If you use this dataset, please cite:
+
+```bibtex
+@misc{liu2025rstarcoderscalingcompetitivecode,
+      title={rStar-Coder: Scaling Competitive Code Reasoning with a Large-Scale Verified Dataset}, 
+      author={Yifei Liu and Li Lyna Zhang and Yi Zhu and Bingcheng Dong and Xudong Zhou and Ning Shang and Fan Yang and Mao Yang},
+      year={2025},
+      eprint={2505.21297},
+      archivePrefix={arXiv},
+      primaryClass={cs.CL},
+      url={https://arxiv.org/abs/2505.21297}, 
+}
+