Coding-Hard-Astar-Grid

The model receives the prompt (and optional system message). The run uses scorer javascript_function_tests with the JSON configuration below. Pass/fail and partial credit are determined entirely by that scorer against the model output; no human grading.

Return JSON only with a string field named code. The code must be dependency-free JavaScript, define the requested function in the top level or module.exports, and include no markdown, imports, require, timers, network, filesystem, eval, or placeholders.

Implement function shortestGridPath(grid, start, goal). Given a rectangular grid where 0 is open and 1 is blocked, plus start and goal coordinates as [row, col], return the fewest orthogonal moves needed to reach the goal, or -1 when no path exists.

Your JSON must look like {"code":"function shortestGridPath(...) { ... }"}.

{
  "function_name": "shortestGridPath",
  "timeout_ms": 220,
  "test_pass_threshold": 1,
  "partial_credit_threshold": 0.5,
  "tests": "[hidden executable tests]"
}