题目
英语翻译
CC lives on the tree which has N nodes.On every leaf of the tree there is an apple(leaf means there is only one branch connect this node ) .Now CC wants to get two apple ,CC can choose any node to start and the speed of CC is one meter per second.
x05now she wants to know the shortest time to get two apples;
input
x05Thers are many cases;
x05The first line of every case there is a number N(2
CC lives on the tree which has N nodes.On every leaf of the tree there is an apple(leaf means there is only one branch connect this node ) .Now CC wants to get two apple ,CC can choose any node to start and the speed of CC is one meter per second.
x05now she wants to know the shortest time to get two apples;
input
x05Thers are many cases;
x05The first line of every case there is a number N(2
提问时间：2021-04-01
答案
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