Package g1801_1900.s1857_largest_color_value_in_a_directed_graph

Class Solution

java.lang.Object
g1801_1900.s1857_largest_color_value_in_a_directed_graph.Solution
public class Solution extends java.lang.Object
1857 - Largest Color Value in a Directed Graph.

Hard

There is a directed graph of n colored nodes and m edges. The nodes are numbered from 0 to n - 1.

You are given a string colors where colors[i] is a lowercase English letter representing the color of the ith node in this graph ( 0-indexed ). You are also given a 2D array edges where edges[j] = [aj, bj] indicates that there is a directed edge from node aj to node bj.

A valid path in the graph is a sequence of nodes x1 -> x2 -> x3 -> … -> xk such that there is a directed edge from xi to xi+1 for every 1 <= i < k. The color value of the path is the number of nodes that are colored the most frequently occurring color along that path.

Return the largest color value of any valid path in the given graph, or -1 if the graph contains a cycle.

Example 1:

Input: colors = “abaca”, edges = [[0,1],[0,2],[2,3],[3,4]]

Output: 3

Explanation: The path 0 -> 2 -> 3 -> 4 contains 3 nodes that are colored "a" (red in the above image).

Example 2:

Input: colors = “a”, edges = [[0,0]]

Output: -1

Explanation: There is a cycle from 0 to 0.

Constraints:

  • n == colors.length
  • m == edges.length
  • 1 <= n <= 105
  • 0 <= m <= 105
  • colors consists of lowercase English letters.
  • 0 <= aj, bj < n

  • Constructor Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    largestPathValue(java.lang.String colors, int[][] edges)
     

    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

    • largestPathValue

      public int largestPathValue(java.lang.String colors, int[][] edges)