{
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 "model": "qwen3-30b-a3b",
 "mode": "agentic",
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 "slug": "run2-qwen3-30b-a3b-agentic-lru-cache-s0",
 "challenge_title": "LRU cache",
 "spec": "Create lru.py with a class:\n\nclass LRUCache:\n    def __init__(self, capacity: int)\n    def get(self, key) -> value        # return the stored value, or -1 if absent\n    def put(self, key, value) -> None  # insert or update\n\nSemantics: the cache holds at most `capacity` entries. Both get() and put() count as a use of the key. When put() would exceed capacity, evict the least-recently-used key first. put() on an existing key updates its value and makes it most-recently-used.\n\nUse only the Python standard library.",
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   "class LRUCache",
   "def get",
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 "test_files": {
  "test_lru.py": "from lru import LRUCache\n\n\ndef test_basic_put_get():\n    c = LRUCache(2)\n    c.put(\"a\", 1)\n    assert c.get(\"a\") == 1\n    assert c.get(\"missing\") == -1\n\n\ndef test_eviction_order():\n    c = LRUCache(2)\n    c.put(\"a\", 1)\n    c.put(\"b\", 2)\n    c.put(\"c\", 3)\n    assert c.get(\"a\") == -1\n    assert c.get(\"b\") == 2\n    assert c.get(\"c\") == 3\n\n\ndef test_get_refreshes_recency():\n    c = LRUCache(2)\n    c.put(\"a\", 1)\n    c.put(\"b\", 2)\n    c.get(\"a\")\n    c.put(\"c\", 3)\n    assert c.get(\"b\") == -1\n    assert c.get(\"a\") == 1\n\n\ndef test_put_overwrite_refreshes():\n    c = LRUCache(2)\n    c.put(\"a\", 1)\n    c.put(\"b\", 2)\n    c.put(\"a\", 10)\n    c.put(\"c\", 3)\n    assert c.get(\"b\") == -1\n    assert c.get(\"a\") == 10\n\n\ndef test_capacity_one():\n    c = LRUCache(1)\n    c.put(\"a\", 1)\n    c.put(\"b\", 2)\n    assert c.get(\"a\") == -1\n    assert c.get(\"b\") == 2\n"
 },
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   "passed": 5,
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   "ts": "2026-07-17T20:33:51.788784+00:00",
   "event": "graded",
   "total": 100.0,
   "tests_passed": 5,
   "tests_failed": 0,
   "output": ".....                                                                    [100%]\n5 passed in 0.01s\n"
  }
 ],
 "files": {
  "lru.py": "from collections import OrderedDict\n\nclass LRUCache:\n    def __init__(self, capacity: int):\n        self.capacity = capacity\n        self.cache = OrderedDict()\n\n    def get(self, key):\n        if key not in self.cache:\n            return -1\n        self.cache.move_to_end(key)\n        return self.cache[key]\n\n    def put(self, key, value):\n        if key in self.cache:\n            self.cache[key] = value\n            self.cache.move_to_end(key)\n        else:\n            self.cache[key] = value\n            if len(self.cache) > self.capacity:\n                self.cache.popitem(last=False)"
 },
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 "code": {
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 "test_output": ".....                                                                    [100%]\n5 passed in 0.01s\n"
}