You are given an integer n, the number of nodes in a directed graph where the nodes are labeled from 0 to n - 1. Each edge is red or blue in this graph, and there could be self-edges and parallel edges. You are given two arrays redEdges and blueEdges where: redEdges[i] = [ai, bi] indicates that there is a directed red edge from node ai to node bi in the graph, and blueEdges[j] = [uj, vj] indicates that there is a directed blue edge from node uj to node vj in the graph. Return an array answer of length n, where each answer[x] is the length of the shortest path from node 0 to node x such that the edge colors alternate along the path, or -1 if such a path does not exist.