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**Replay**
三排，开场通过签到A，B。
tzw写G，whx写C，yyt写I。I先通过，whx调过C，tzw调过G。
讨论后yyt写E通过，tzw写F通过。
yyt与whx讨论H，实现算法后发现无法通过。
**Problems**
G：模拟。
E：注意到不可能嵌套超过2层，开队列优化dp。
F：dijkstra求最短路dag，tarjan求桥，或者在dag上dp。
H：网络流。
**Dirt**
C(-1) 忘了与1取max。
F(-3) dag dp的顺序有问题。
H(-3) dp做法正确性没有保证。