[算法总结] 线段树(不会详讲)!

*DDL_GzmBlog 发布时间：2021-04-30 16:02:06 ，浏览量：3

线段树

1.树的信息
2.针对单点操作
- -pushup操作(通过子节点信息来计算父节点)
- -建树操作
- -查询操作
- -单点更新
3.针对区间的操作
- -关于lazy标记
- -pushup(更新父节点操作没变)
- -建树操作(也没变)
- -PushDown操作
- -查询操作(多了一个pushdown操作)
- -更新操作(区间更新)
以上两个模板
- 1.单点区间求最大
- 2.求区间和

本篇线段树分析的是Acwing上的线段树代码

1.树的信息

这里注意 , 请开4倍空间 , 无证明这里用结点存储区间少了在函数那里的形参 (yxc yyds!)

struct node
{
    int l,r;
    int v;
}tr[N*4];///开4倍空间

2.针对单点操作 -pushup操作(通过子节点信息来计算父节点)

这里求的是最大值 u

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[算法总结] 线段树(不会详讲)!

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