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The is_chain function fails to accurately detect chain structures. The current logic only checks that there's one node with an out-degree of 0 and all other nodes have an out-degree of 1. However, this overlooks cases where multiple nodes converge (i.e., nodes with an in-degree > 1), which are not valid for a chain structure.
Example:
Consider a graph with paths:
A → B → D
C → B
Here, D has an out-degree of 0, and all other nodes have an out-degree of 1, yet this is clearly not a single chain.
Suggested Fix:
To correctly identify a chain, the function should:
Verify there is exactly one start node (in-degree 0) and one end node (out-degree 0).
Ensure all other nodes have in-degree and out-degree of 1.
This correction will prevent false positives and ensure accurate chain detection.
andylizf
commented
2 hours ago
The
is_chainfunction fails to accurately detect chain structures. The current logic only checks that there's one node with an out-degree of 0 and all other nodes have an out-degree of 1. However, this overlooks cases where multiple nodes converge (i.e., nodes with an in-degree > 1), which are not valid for a chain structure.Example: Consider a graph with paths:
Here,
Dhas an out-degree of 0, and all other nodes have an out-degree of 1, yet this is clearly not a single chain.Suggested Fix: To correctly identify a chain, the function should:
This correction will prevent false positives and ensure accurate chain detection.