LP4284 [SHOI2014]概率充电器 [期望/树形dp]
[HNOI2018] 毒瘤 [DDP]
CF348E Pilgrims [树状DP]
LP3830 [SHOI2012] 随机树 [期望/DP]
LP2081 [NOI2012]迷失游乐园 [期望/基环树]
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LP4381 [IOI2008]Island [基环树/DP]