FA-97602 / Knitting and sewing pattern grading / Member archive

Quilt binding strip planner: diagonal join loss · case 02

The planner cuts an extra strip because it counts a join on the last strip.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Usable strip length = fabric_width - 2*selvage. Joining n strips with diagonal seams loses strip_width per join (n-1 joins). Need perimeter + tail. n is the smallest count with n*usable - (n-1)*strip_width >= need. Return [n, fabric cut length n*strip_width, surplus]; usable <= strip_width -> "error: fabric too narrow".

Why this case matters

Quilters cut width-of-fabric strips and join them diagonally to bind the quilt edge.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
two strips	`[2, 12, 4]`	`[2, 12, 10]`	Failed

MEMBER ARCHIVE

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