阶段性做题总结

        有一段时间没有做USACO了,主要是遇到了3.4 Closed Fence! 这题很麻烦的,计算几何的繁题。于是开始做PKU,原来想做TJU,可惜爆掉了~ 后来我们老师说PKU没有题解,做题不知道好坏,推荐我去做SGU,现在在根据"泛做题目列表"做SGU。

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