Practice Shortest Path with Alternating Colors
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Shortest Path with Alternating Colors
The directed graph has nodes 0 through n - 1. Each pair [a, b] in redEdges is a red edge from a to b; each pair in blueEdges is a blue edge in the same direction. Self-loops and parallel edges are allowed. Return an array of length n whose entry for x is the fewest edges in a path from 0 to x with alternating edge colors. Use -1 if no such path exists.
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Understanding the Shortest Path with Alternating Colors Problem
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Problem Statement
The directed graph has nodes 0 through n - 1. Each pair [a, b] in redEdges is a red edge from a to b; each pair in blueEdges is a blue edge in the same direction. Self-loops and parallel edges are allowed. Return an array of length n whose entry for x is the fewest edges in a path from 0 to x with alternating edge colors. Use -1 if no such path exists.
Source: Shortest Path with Alternating Colors on LeetCode. Use the original task for its coding environment and submissions.
Shortest Path with Alternating Colors
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Examples
# Example 1
n = 3, redEdges = [[0,1],[1,2]], blueEdges = []
[0,1,-1]
# Example 2
n = 3, redEdges = [[0,1]], blueEdges = [[2,1]]
[0,1,-1]
Constraints
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