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====== 赛时总结 ======
A：xhy签了三天到了
B：签到题，建个二叉树就完了(怎么会有蠢货赋值语句写==呀)
F：与xhy讨论做法复杂度有误，最后发现sqh类似筛法暴力的做正确
K：签到题
====== 总结 ======
无论如何，8月6号后没有再一次下降过排名。
====== Dirt ======
K：很快写出来了，答案算重复了，中期才找到错误
H：猜结论，没猜中，浪费太多上机时间