视频链接：   P3574[POI2014]FAR-FarmCraft-洛谷|计算机科学教育新生态(luogu.com.cn)//树形DP+贪心O(nlogn)#include<iostream>#include<cstring>#include<algorithm>usingnamespacestd;constintN=500005;inthead[N],to[N<<1],ne[N<