source: https://leetcode.com/problems/is-graph-bipartite/description/ Is Graph Bipartite? There is an undirected graph with n nodes, where each node is numbered between 0 and n – 1. You are given a 2D array graph, where graph[u] is an array of nodes that node u is adjacent to. More formally, for each v in graph[u], there is an undirected ...