Package g1101_1200.s1129_shortest_path_with_alternating_colors

Class Solution

java.lang.Object

g1101_1200.s1129_shortest_path_with_alternating_colors.Solution

public class Solution
extends Object

1129 - Shortest Path with Alternating Colors.

Medium

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.

Example 1:

Input: n = 3, redEdges = [[0,1],[1,2]], blueEdges = []

Output: [0,1,-1]

Example 2:

Input: n = 3, redEdges = [[0,1]], blueEdges = [[2,1]]

Output: [0,1,-1]

Constraints:

• 1 <= n <= 100
• 0 <= redEdges.length, blueEdges.length <= 400
• redEdges[i].length == blueEdges[j].length == 2
• 0 <= ai, bi, uj, vj < n

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int[]	shortestAlternatingPaths(int n, int[][] redEdges, int[][] blueEdges)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

shortestAlternatingPaths

public int[] shortestAlternatingPaths(int n,
 int[][] redEdges,
 int[][] blueEdges)