## 第四次（7/16） --- - [A. 遞增矩陣](https://hackmd.io/@problem-solved-sgroup/By-lg7YRu) - [B. 硬幣樓梯](https://hackmd.io/@problem-solved-sgroup/B1fzg7Y0_) - [C. 圓圈遊戲](https://hackmd.io/@problem-solved-sgroup/S13mlXYCd) - [D. 神奇函式](https://hackmd.io/@problem-solved-sgroup/HJAYx7KRO)
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