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**Replay** whx，tzw双排，开场通过签到A，B，H。 whx通过K，tzw通过F. whx写D被卡精度，tzw写L通过，修改参数通过D。 J读错题，无时间写正解。 **Problems** B：模拟。 K：二分。 F：注意到点数不会很多，暴力枚举即可。 D：dp，精度较困难。 L：最短路。 **Dirt** F(-2)：复杂度过高 D(-13)：精度被卡 L(-1)：特判距离为1的情况，不能拆