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如何出一场好的OI比赛? - 知乎
source link: https://www.zhihu.com/question/318897379/answer/642223672
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也许你是突然脑子抽风想出份比赛，或者是看到网上这么多神牛要出题虐虐他们，或者是觉得出题很好玩想出比…
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