Programmer Think

Title Link: Binary apple tree - Luogu Analysis: This is a tree DP topic. It's not too difficult, but it's easy to grasp the details. Let's explain this topic directly below: Let f[i][j] represent the maximum number of apples that can be retained by retaining j branches in the subtree with I as the root. After knowing the state representatio ...

background One day, a group of dogs suddenly began to moisten people in the past, so the students banned this part of the science and technology building.   ~   Deadcodes: old machine room Problem surface Your country ...

Data structures: trees 1, Tree 1. Definition of tree A set composed of N nodes, n=0 is called an empty tree, and a tree with n=1 has only one node. For a tree with n > 1, T has: The top node is called the root node, and the root node has no precursor nodeExcept for the root node, the other nodes are divided into m disjoint sets, and each ...

Recently, there is a requirement for a permission tree, and the structure of the tree is relatively deep. If you want to implement it, you can obtain the value of the parent node and pass it to the back end after incomplete selection of the child node. After incomplete sub node selection, you want to obtain the value of the parent node As sho ...

I'm too lazy to talk nonsense. I'm a fool. C Title Description Given a tree with \ (n \) points, record \ (L(u,v) \) as the number of points on the \ ((u,v) \) simple path. For the path \ ((a,b),(c,d) \) point disjoint Quad \ ((a,b,c,d) \), we want to know how many different values \ ((L(a,b),L(c,d)) \) have. \(n\leq 5\cdot 10^5\) solution The ...