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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