{ "data": { "question": { "questionId": "1986", "questionFrontendId": "1857", "boundTopicId": null, "title": "Largest Color Value in a Directed Graph", "titleSlug": "largest-color-value-in-a-directed-graph", "content": "

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

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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.

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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.

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

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Example 1:

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\"\"

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\r\nInput: colors = "abaca", edges = [[0,1],[0,2],[2,3],[3,4]]\r\nOutput: 3\r\nExplanation: The path 0 -> 2 -> 3 -> 4 contains 3 nodes that are colored "a" (red in the above image).\r\n
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Example 2:

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\"\"

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\r\nInput: colors = "a", edges = [[0,0]]\r\nOutput: -1\r\nExplanation: There is a cycle from 0 to 0.\r\n
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Constraints:

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Most standard library headers are already included automatically for your convenience.

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Most standard library headers are already included automatically for your convenience.

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Python 2.7.12.

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Most standard library headers are already included automatically for your convenience.

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3. Deleting an item in a hash:\\r\\n

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C# 10 with .NET 6 runtime

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Ruby 3.1

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Swift 5.5.2.

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Go 1.17.6.

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Python 3.10.

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