[二叉树+模拟]uva-679-Dropping Balls
https://cn.vjudge.net/problem/UVA-679#author=0
二叉树第一题 上图上图 模拟来理解树的结构




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[二叉树+模拟]uva-679-Dropping Balls
https://47.97.0.163/2019/07/23/二叉树模拟uva-679-dropping-balls/