Luogu P1600 [NOIP2016] 天天爱跑步

qwq

Luogu P2680 [NOIP2015] 运输计划

qwq

树上差分

树上茶粉难吃

hzoi-CSP-56

都是好题

BZOJ 3331 [BeiJing2013] 压力

圆方树真好用.jpg

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