Instance files
Each instance you start comes as a JSON file named <slug>-<name>.json, in the problem's instance schema. It has the same format as the problem's public instances, so a solver that reads those reads these. See Reading the schemas.
The solution file
Upload one file per instance:
- a JSON object, encoded as UTF-8;
- following the problem's solution schema, shown on each problem page;
- with a numeric
objective_value, which the checker recomputes from your decisions; - at most 4 MB.
solution.json · barnhart2000
{
"objective_value": 111,
"commodities": [
{ "commodity_id": 0, "rejected": true, "path_arcs": [] }
]
}
On the dashboard, choose the file in the instance's row. Over the API, send it as the raw request body of PUT …/solution.
What is checked when
| When | What | If it fails |
|---|---|---|
| At upload | The file is valid JSON, a JSON object, and has a numeric objective_value. | The upload is refused and you can upload again before the deadline. |
| After the submission closes | The checker verifies every constraint and recomputes the objective. | The instance scores 0 with the reason. |
A solution that passes the upload check is final, even if the checker later rejects it. Run the problem's checker on it before uploading; where the checker is not published, as in Stage 2, verify feasibility yourself.
Uploads are final
Each instance takes one solution. Once uploaded, it cannot be replaced.