Given <code>n = 5</code> and <code>edges = [[0, 1], [1, 2], [3, 4]]</code>, what should your return? Is this case a valid tree?

According to the <a href="https://en.wikipedia.org/wiki/Tree_(graph_theory)" target="_blank">definition of tree on Wikipedia</a>: “a tree is an undirected graph in which any two vertices are connected by <i>exactly</i> one path. In other words, any connected graph without simple cycles is a tree.”