FA-12482 / Molecular graph representation / Member archive

Disconnected fragment charges are collapsed into a neutral flag · case 02

Disconnected fragment charges are collapsed into a neutral flag.

Member previewVariant 2 · 3 implementations · 6 checks per implementation

Case contract

Input is an ordered list of molecular fragments, each a list of signed atom formal charges. Return per-fragment signed sums preserving order and empty fragments as zero.

Why this case matters

Controlled molecular graph interchange model; tests isolate atom or bond representation errors without claiming chemical validity or production toolkit equivalence.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
salt fragments	`[0]`	`[2, -2]`	Failed

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