Given is a tree G with N vertices. The vertices are numbered 1 through N, and the i-th edge connects Vertex ai and Vertex bi. Consider painting the edges in G with some number of colors. We want to paint them so that, for each vertex, the colors of the edges incident to that ver...
Thedepthof the vertex is the number of nodes on the path from the root tovalong the edges. In particular, the depth of the root is equal to1. We say that vertexuis in thesubtreeof vertexv, if we can get fromutov, moving from the vertex to the parent. In particular, vertexvis in...
Given is a tree G with N vertices. The vertices are numbered 1 through N, and the i-th edge connects Vertex ai and Vertex bi. Consider painting the edges in G with some number of colors. We want to paint them so that, for each vertex, the colors of the edges incident to that ver...
Thedepthof the vertex is the number of nodes on the path from the root tovalong the edges. In particular, the depth of the root is equal to1. We say that vertexuis in thesubtreeof vertexv, if we can get fromutov, moving from the vertex to the parent. In particular, vertexvis in...
DFS DFS基于栈,也是每个节点只访问了一次,时间复杂度O(N) 巧的是,我们只需在层次遍历的基础上改动【一处】,即改变pop元素的位置,就实现了BFS到DFS的转变 栈总是弹出最后一个元素,而队列总是弹出队首元素,因此将pop(0)改为pop()即可 # 使用【栈】进行深度优先遍历 ...
Max product non-intersection paths in tree Question: Given an undirected tree with N nodes ( 2 <= N <= 100,000 ) and N-1 edges, how can I find two non-intersecting paths with maximum product? Example: 6 1-2 2-3 2-4 5-4 6-4 Answer: 4 ... ...
Depth: The depth of a node is the number of edges from the node to the tree's root node. The root node has depth 0. stack & queue -> in preorder Algorithm Crush Morris Traversal (change pointer, link the rightmost node of the left node to the root. we can apply this pattern to...
In the first sample case, a path of three edges is obtained after merging paths2 - 1 - 6and2 - 4 - 5. It is impossible to perform any operation in the second sample case. For example, it is impossible to merge paths1 - 3 - 4and1 - 5 - 6...
Let G = (V, E) be a directed graph on n vertices and m edges. We address the problem of maintaining a depth first search (DFS) tree efficiently under insertion/deletion of edges in G. 1. We present an efficient randomized decremental algorithm for maintaining a DFS tree for a directed...
The depth of the vertex is the number of nodes on the path from the root tovalong the edges. In particular, the depth of the root is equal to 1. We say that vertexuis in the subtree of vertexv, if we can get fromutov, moving from the vertex to the parent. In particular, vertex...