## 第五次（7/23 ~ 7/30）
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- [A. 最長回文子字串(Easy)](https://hackmd.io/@problem-solved-sgroup/BJRapdIbt)
- [B. 字串解碼](https://hackmd.io/@problem-solved-sgroup/SkkgCu8bF)
- [C. 排列組合](https://hackmd.io/@problem-solved-sgroup/B1dZCdLbY)
- [D. 預測贏家](https://hackmd.io/@problem-solved-sgroup/S19GA_IbY)
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