FA-69087 / Tide and marine navigation tables / Member archive

Tidal height window: Window edges are rounded to the nearest minute · case 02

Published windows can open before the water is deep enough.

Member previewVariant 2 · 3 implementations · 7 checks per implementation

Case contract

Input [ts, hs, req]: sample times (minutes) and heights. Return the list of [start, end] intervals where height>=req, with crossing times linearly interpolated and rounded conservatively inward (start up, end down, 1e-9 tolerance); windows that vanish after rounding are dropped. A window open at the first sample starts at ts[0]; one still open at the end closes at ts[-1].

Why this case matters

Tide tables and passage plans turn published predictions into go/no-go decisions about depth, clearance and timing.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
tidal height window [[0, 60, 120, 180, 240, 300, 360], [1.0, 1.8, 2.9, 3.6, 3.1, 2.2, 1.4], 3.3]	`[[154, 216]]`	`[[155, 216]]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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