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https://kvrmnks.top/2020/11/28/2020/%E9%A1%B6%E7%82%B9%E8%A6%86%E7%9B%96%E9%97%AE%E9%A2%98%E5%BA%A6%E6%95%B0%E8%B4%AA%E5%BF%83%E7%AE%97%E6%B3%95%E7%9A%84%E4%B8%80%E4%B8%AA%E4%B8%8B%E7%95%8C/
顶点覆盖问题度数贪心算法的一个下界这个是我做课后题遇到了，结果我构造了大约50min…