CodePivot: Bootstrapping Multilingual Transpilation in LLMs via Reinforcement Learning without Parallel Corpora. - Shangyu Li; Juyong Jiang; Meibo Ren; Sizhe Zhong; Huiri Tan; Yunhao Gou; Xu Han; Chun Yong Chong; Yun Peng; Jiasi Shen 001 (CoRR, 2026)