题目来自 THUPC 2019，Git 仓库地址：https://github.com/wangyurzee7/THUPC2019
QOJ.ac
QOJ
Time Limit:
10 s
Memory Limit:
512 MB
Total points:
100
#2814. 不用找的树
统计
该题目在以下比赛中使用过：
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