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蓝桥杯2013年第四届真题-大臣的旅费

不牌不改发布时间：2022-03-04 10:30:44 ，浏览量：4

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题解

本质上是一个计算树的直径的问题。（模板题）

树的直径有两种计算方式：

两次dfs。以任意一点X为根节点，第一次dfs找到距离X最远的节点P，第二次dfs找到距离节点P最远的节点Q，P和Q的距离就是树的直径。
树型DP。两个数组mx[i]，_mx[i]分别记录当前节点i到根节点（随意选取）的最大距离和次最大距离。假设j为i的子结点，更新方式：如果mx[i]


    
        
            
                
                
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