{
  "schema": "ml-prep/item@1",
  "item": {
    "id": "leetcode-752-open-the-lock",
    "area": "programming",
    "topic": "data-structures",
    "origin": "external",
    "title": "Open the Lock",
    "skills": [
      "queue",
      "bfs",
      "dictionaries-sets"
    ],
    "priority": "core",
    "difficulty": "medium",
    "estimated_minutes": 25,
    "prerequisites": [
      "graphs",
      "shortest-path"
    ],
    "source_id": "leetcode",
    "locator": {
      "document": "LeetCode Problem Set",
      "label": "Problem 752: Open the Lock"
    },
    "links": {
      "problem": "https://leetcode.com/problems/open-the-lock/",
      "solution": "https://leetcode.com/problems/open-the-lock/"
    },
    "selection_note": "Models an implicit state graph and requires BFS with visited-state handling; submissions receive judge feedback.",
    "answer_status": "official-interactive-feedback"
  }
}