dyllanzhou的专栏

Clone an undirected graph. Each node in the graph contains a label and a list of itsneighbors.OJ's undirected graph serialization:Nodes are labeled uniquely.We use # as a separator for each

Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of nodes), write a function to check whether these edges make up a valid tree.For example:Given n =