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**Replay**
whx，tzw双排，开场通过签到A,K。
tzw写I通过，whx写C通过。
tzw写H未通过。
**Problems**
I：二分开根。
H：旋转卡壳。
**Dirt**
K(-3)：想清楚算法。
H(-9)：旋转卡壳写错，缺少模板。