摘要：
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 mak 阅读全文
摘要：
Given a undirected graph, a node and a target, return the nearest node to given node which value of it is target, return NULL if you can't find. There 阅读全文