{"id":2248,"date":"2026-04-29T23:18:18","date_gmt":"2026-04-29T15:18:18","guid":{"rendered":"http:\/\/www.preluna.xyz\/?p=2248"},"modified":"2026-04-29T23:18:43","modified_gmt":"2026-04-29T15:18:43","slug":"defaultdictlist","status":"publish","type":"post","link":"http:\/\/www.preluna.xyz\/index.php\/2026\/04\/29\/defaultdictlist\/preluna\/text\/","title":{"rendered":"defaultdict(list)"},"content":{"rendered":"\n
\"\"<\/div><\/figure>\n\n\n\n

\u8fd9\u9053\u9898\u672c\u8d28\u4e0a\u5728\u8003\u4ec0\u4e48<\/h2>\n\n\n\n

\u8fd9\u9053\u9898\u8003\u7684\u662f\uff1a\u5982\u4f55\u8bb0\u5f55\u4e00\u4e2a\u5355\u8bcd\u5728 A \u7ec4\u4e2d\u51fa\u73b0\u8fc7\u54ea\u4e9b\u4f4d\u7f6e\uff0c\u7136\u540e\u5feb\u901f\u67e5\u8be2 B \u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5355\u8bcd\u3002<\/strong><\/p>\n\n\n\n

\u9898\u76ee\u4e0d\u662f\u8ba9\u4f60\u5224\u65ad\u5355\u8bcd\u6709\u6ca1\u6709\u51fa\u73b0\u4e00\u6b21\uff0c\u800c\u662f\u8981\u8f93\u51fa\u5b83\u5728 A \u7ec4\u4e2d\u51fa\u73b0\u7684\u6240\u6709\u4f4d\u7f6e\u3002<\/p>\n\n\n\n

\u4f8b\u5982 A \u7ec4\u662f\uff1a<\/p>\n\n\n\n

a\na\nb\na\nb\n<\/code><\/pre>\n\n\n\n
\u4f4d\u7f6e\u4ece 1 \u5f00\u59cb\u7f16\u53f7\uff1a<\/p>\n\n\n\n
\u7b2c1\u4e2a\uff1aa\n\u7b2c2\u4e2a\uff1aa\n\u7b2c3\u4e2a\uff1ab\n\u7b2c4\u4e2a\uff1aa\n\u7b2c5\u4e2a\uff1ab\n<\/code><\/pre>\n\n\n\n
\u6240\u4ee5\uff1a<\/p>\n\n\n\n
a \u51fa\u73b0\u5728 1 2 4\nb \u51fa\u73b0\u5728 3 5\n<\/code><\/pre>\n\n\n\n
\u5982\u679c B \u7ec4\u67e5\u8be2\u7684\u662f\uff1a<\/p>\n\n\n\n
a\nb\n<\/code><\/pre>\n\n\n\n
\u8f93\u51fa\u5c31\u662f\uff1a<\/p>\n\n\n\n
1 2 4\n3 5\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u4e00\u3001\u5148\u628a\u9898\u76ee\u7ffb\u8bd1\u6210\u4eba\u8bdd<\/h2>\n\n\n\n
\u8f93\u5165\u5206\u6210\u4e09\u90e8\u5206\uff1a<\/p>\n\n\n\n
\u7b2c\u4e00\u884c\uff1a<\/p>\n\n\n\n
n m\n<\/code><\/pre>\n\n\n\n
\u8868\u793a\uff1a<\/p>\n\n\n\n
A \u7ec4\u6709 n \u4e2a\u5355\u8bcd\nB \u7ec4\u6709 m \u4e2a\u5355\u8bcd\n<\/code><\/pre>\n\n\n\n
\u63a5\u4e0b\u6765 n \u884c\uff0c\u662f A \u7ec4\u5355\u8bcd\u3002<\/p>\n\n\n\n
\u518d\u63a5\u4e0b\u6765 m \u884c\uff0c\u662f B \u7ec4\u5355\u8bcd\uff0c\u4e5f\u5c31\u662f\u8981\u67e5\u8be2\u7684\u5355\u8bcd\u3002<\/p>\n\n\n\n
\u8981\u6c42\u4f60\u5bf9 B \u7ec4\u91cc\u7684\u6bcf\u4e2a\u5355\u8bcd\u505a\u67e5\u8be2\uff1a<\/p>\n\n\n\n
\u5982\u679c\u8fd9\u4e2a\u5355\u8bcd\u5728 A \u7ec4\u51fa\u73b0\u8fc7\uff0c\u5c31\u8f93\u51fa\u5b83\u51fa\u73b0\u7684\u6240\u6709\u4f4d\u7f6e\u3002<\/p>\n\n\n\n
\u5982\u679c\u6ca1\u6709\u51fa\u73b0\u8fc7\uff0c\u5c31\u8f93\u51fa\uff1a<\/p>\n\n\n\n
-1\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u4e8c\u3001\u8fd9\u9053\u9898\u5e94\u8be5\u600e\u4e48\u601d\u8003<\/h2>\n\n\n\n
\u5173\u952e\u95ee\u9898\u662f\uff1a<\/p>\n\n\n\n
\u5bf9\u4e8e A \u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5355\u8bcd\uff0c\u6211\u4eec\u8981\u8bb0\u4f4f\u5b83\u51fa\u73b0\u8fc7\u54ea\u4e9b\u4f4d\u7f6e\u3002<\/strong><\/p>\n\n\n\n
\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u5efa\u7acb\u4e00\u4e2a\u201c\u5355\u8bcd -> \u4f4d\u7f6e\u5217\u8868\u201d\u7684\u5173\u7cfb\u3002<\/p>\n\n\n\n
\u6bd4\u5982 A \u7ec4\u662f\uff1a<\/p>\n\n\n\n
a\na\nb\na\nb\n<\/code><\/pre>\n\n\n\n
\u6211\u4eec\u5e0c\u671b\u6700\u540e\u5f97\u5230\uff1a<\/p>\n\n\n\n
{\n    \"a\": [1, 2, 4],\n    \"b\": [3, 5]\n}\n<\/code><\/pre>\n\n\n\n
\u8fd9\u6837\u540e\u9762\u67e5\u8be2\u7684\u65f6\u5019\u5c31\u5f88\u7b80\u5355\u4e86\u3002<\/p>\n\n\n\n
\u5982\u679c\u67e5\u8be2 \"a\"<\/code>\uff0c\u76f4\u63a5\u627e\u5230\uff1a<\/p>\n\n\n\n
[1, 2, 4]\n<\/code><\/pre>\n\n\n\n
\u5982\u679c\u67e5\u8be2 \"b\"<\/code>\uff0c\u76f4\u63a5\u627e\u5230\uff1a<\/p>\n\n\n\n
[3, 5]\n<\/code><\/pre>\n\n\n\n
\u5982\u679c\u67e5\u8be2 \"c\"<\/code>\uff0c\u53d1\u73b0\u6ca1\u6709\u8fd9\u4e2a key\uff0c\u5c31\u8f93\u51fa -1<\/code>\u3002<\/p>\n\n\n\n
\n\n\n\n
\u4e09\u3001\u4e3a\u4ec0\u4e48\u9002\u5408\u7528 defaultdict(list)<\/h2>\n\n\n\n
\u666e\u901a\u5b57\u5178 dict<\/code> \u5982\u679c\u4f60\u60f3\u8fd9\u6837\u5199\uff1a<\/p>\n\n\n\n
d[\"a\"].append(1)\n<\/code><\/pre>\n\n\n\n
\u524d\u63d0\u662f d[\"a\"]<\/code> \u5df2\u7ecf\u5b58\u5728\uff0c\u800c\u4e14\u5b83\u5fc5\u987b\u662f\u4e00\u4e2a\u5217\u8868\u3002<\/p>\n\n\n\n
\u5426\u5219\u4f1a\u62a5\u9519\uff0c\u56e0\u4e3a\u4e00\u5f00\u59cb\u5b57\u5178\u91cc\u6ca1\u6709 \"a\"<\/code> \u8fd9\u4e2a key\u3002<\/p>\n\n\n\n
\u6240\u4ee5\u666e\u901a\u5199\u6cd5\u901a\u5e38\u8981\u8fd9\u6837\uff1a<\/p>\n\n\n\n
d = {}\n\nif \"a\" not in d:\n    d[\"a\"] = []\n\nd[\"a\"].append(1)\n<\/code><\/pre>\n\n\n\n
\u4f46\u662f defaultdict(list)<\/code> \u53ef\u4ee5\u5e2e\u6211\u4eec\u81ea\u52a8\u521b\u5efa\u7a7a\u5217\u8868\u3002<\/p>\n\n\n\n
from collections import defaultdict\n\nd = defaultdict(list)\nd[\"a\"].append(1)\nd[\"a\"].append(2)\n<\/code><\/pre>\n\n\n\n
\u8fd9\u65f6\u5b57\u5178\u4f1a\u53d8\u6210\uff1a<\/p>\n\n\n\n
{\n    \"a\": [1, 2]\n}\n<\/code><\/pre>\n\n\n\n
\u4e5f\u5c31\u662f\u8bf4\uff1a<\/p>\n\n\n\n
defaultdict(list)\n<\/code><\/pre>\n\n\n\n
\u53ef\u4ee5\u7406\u89e3\u6210\uff1a<\/p>\n\n\n\n
\n
\u5982\u679c\u67d0\u4e2a key \u7b2c\u4e00\u6b21\u51fa\u73b0\uff0c\u5c31\u81ea\u52a8\u7ed9\u5b83\u914d\u4e00\u4e2a\u7a7a\u5217\u8868 []<\/code>\u3002<\/p>\n<\/blockquote>\n\n\n\n
\u6240\u4ee5\u8fd9\u9053\u9898\u975e\u5e38\u9002\u5408\u7528\uff1a<\/p>\n\n\n\n
defaultdict(list)\n<\/code><\/pre>\n\n\n\n
\u56e0\u4e3a\u6211\u4eec\u6b63\u597d\u8981\u8bb0\u5f55\uff1a<\/p>\n\n\n\n
\u5355\u8bcd -> \u591a\u4e2a\u4f4d\u7f6e\n<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u56db\u3001\u57fa\u672c\u4ee3\u7801\u7ed3\u6784<\/h2>\n\n\n\n
\u8fd9\u9053\u9898\u7684\u6574\u4f53\u6b65\u9aa4\u662f\uff1a<\/p>\n\n\n\n
    \n
  1. \u8bfb\u5165 n<\/code> \u548c m<\/code><\/li>\n\n\n\n
  2. \u521b\u5efa\u4e00\u4e2a\u5b57\u5178\uff0c\u7528\u6765\u4fdd\u5b58 A \u7ec4\u5355\u8bcd\u7684\u4f4d\u7f6e<\/li>\n\n\n\n
  3. \u8bfb\u53d6 A \u7ec4\u7684 n \u4e2a\u5355\u8bcd\uff0c\u8bb0\u5f55\u6bcf\u4e2a\u5355\u8bcd\u51fa\u73b0\u7684\u4f4d\u7f6e<\/li>\n\n\n\n
  4. \u8bfb\u53d6 B \u7ec4\u7684 m \u4e2a\u5355\u8bcd<\/li>\n\n\n\n
  5. \u5bf9\u6bcf\u4e2a B \u7ec4\u5355\u8bcd\u67e5\u8be2\uff1a\n
      \n
    • \u5982\u679c\u51fa\u73b0\u8fc7\uff0c\u8f93\u51fa\u6240\u6709\u4f4d\u7f6e<\/li>\n\n\n\n
    • \u5982\u679c\u6ca1\u51fa\u73b0\u8fc7\uff0c\u8f93\u51fa -1<\/code><\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n
      \u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n
      from collections import defaultdict\n\nn, m = map(int, input().split())\n\npositions = defaultdict(list)\n\nfor i in range(1, n + 1):\n    word = input().strip()\n    positions[word].append(i)\n\nfor _ in range(m):\n    word = input().strip()\n\n    if word in positions:\n        print(*positions[word])\n    else:\n        print(-1)\n<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      \u4e94\u3001\u9010\u884c\u89e3\u91ca\u4ee3\u7801<\/h2>\n\n\n\n
      \u5148\u770b\u7b2c\u4e00\u884c\uff1a<\/p>\n\n\n\n
      from collections import defaultdict\n<\/code><\/pre>\n\n\n\n
      \u8fd9\u8868\u793a\u4ece collections<\/code> \u6a21\u5757\u91cc\u5bfc\u5165 defaultdict<\/code>\u3002<\/p>\n\n\n\n
      defaultdict<\/code> \u662f\u4e00\u79cd\u7279\u6b8a\u5b57\u5178\uff0c\u9002\u5408\u7528\u6765\u5904\u7406\u201c\u4e00\u4e2a key \u5bf9\u5e94\u591a\u4e2a\u503c\u201d\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n
      \n\n\n\n
      \u7136\u540e\u8bfb\u5165\u7b2c\u4e00\u884c\uff1a<\/p>\n\n\n\n
      n, m = map(int, input().split())\n<\/code><\/pre>\n\n\n\n
      \u6bd4\u5982\u8f93\u5165\u662f\uff1a<\/p>\n\n\n\n
      5 2\n<\/code><\/pre>\n\n\n\n
      input()<\/code> \u8bfb\u5230\u7684\u662f\u5b57\u7b26\u4e32\uff1a<\/p>\n\n\n\n
      \"5 2\"\n<\/code><\/pre>\n\n\n\n
      split()<\/code> \u628a\u5b83\u62c6\u6210\uff1a<\/p>\n\n\n\n
      [\"5\", \"2\"]\n<\/code><\/pre>\n\n\n\n
      map(int, ...)<\/code> \u628a\u5b57\u7b26\u4e32\u8f6c\u6210\u6574\u6570\uff1a<\/p>\n\n\n\n
      5, 2\n<\/code><\/pre>\n\n\n\n
      \u6700\u540e\u8d4b\u503c\u7ed9\uff1a<\/p>\n\n\n\n
      n = 5\nm = 2\n<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      \u521b\u5efa\u5b57\u5178\uff1a<\/p>\n\n\n\n
      positions = defaultdict(list)\n<\/code><\/pre>\n\n\n\n
      \u8fd9\u4e2a\u5b57\u5178\u7528\u6765\u4fdd\u5b58\u6bcf\u4e2a\u5355\u8bcd\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002<\/p>\n\n\n\n
      \u6bd4\u5982\u6700\u540e\u53ef\u80fd\u957f\u8fd9\u6837\uff1a<\/p>\n\n\n\n
      {\n    \"a\": [1, 2, 4],\n    \"b\": [3, 5]\n}\n<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      \u8bfb\u53d6 A \u7ec4\u5355\u8bcd\uff1a<\/p>\n\n\n\n
      for i in range(1, n + 1):\n    word = input().strip()\n    positions[word].append(i)\n<\/code><\/pre>\n\n\n\n
      \u8fd9\u91cc\u975e\u5e38\u5173\u952e\u3002<\/p>\n\n\n\n
      \u4e3a\u4ec0\u4e48\u662f\uff1a<\/p>\n\n\n\n
      range(1, n + 1)\n<\/code><\/pre>\n\n\n\n
      \u56e0\u4e3a\u9898\u76ee\u8981\u6c42\u8f93\u51fa\u7684\u4f4d\u7f6e\u662f\u4ece 1 \u5f00\u59cb\uff0c\u4e0d\u662f\u4ece 0 \u5f00\u59cb\u3002<\/p>\n\n\n\n
      \u5982\u679c n = 5<\/code>\uff0c\u90a3\u4e48\uff1a<\/p>\n\n\n\n
      range(1, n + 1)\n<\/code><\/pre>\n\n\n\n
      \u5b9e\u9645\u5c31\u662f\uff1a<\/p>\n\n\n\n
      1, 2, 3, 4, 5\n<\/code><\/pre>\n\n\n\n
      \u5047\u8bbe\u8f93\u5165\u7684 A \u7ec4\u662f\uff1a<\/p>\n\n\n\n
      a\na\nb\na\nb\n<\/code><\/pre>\n\n\n\n
      \u6267\u884c\u8fc7\u7a0b\u662f\uff1a<\/p>\n\n\n\n
      i<\/th>word<\/th>\u6267\u884c\u540e positions<\/th><\/tr><\/thead>
      1<\/td>a<\/td>{\"a\": [1]}<\/code><\/td><\/tr>
      2<\/td>a<\/td>{\"a\": [1, 2]}<\/code><\/td><\/tr>
      3<\/td>b<\/td>{\"a\": [1, 2], \"b\": [3]}<\/code><\/td><\/tr>
      4<\/td>a<\/td>{\"a\": [1, 2, 4], \"b\": [3]}<\/code><\/td><\/tr>
      5<\/td>b<\/td>{\"a\": [1, 2, 4], \"b\": [3, 5]}<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
      \u6240\u4ee5\u8fd9\u4e00\u53e5\uff1a<\/p>\n\n\n\n
      positions[word].append(i)\n<\/code><\/pre>\n\n\n\n
      \u610f\u601d\u662f\uff1a<\/p>\n\n\n\n
      \n
      \u628a\u5f53\u524d\u5355\u8bcd\u51fa\u73b0\u7684\u4f4d\u7f6e i \u8ffd\u52a0\u5230\u5b83\u5bf9\u5e94\u7684\u5217\u8868\u4e2d\u3002<\/p>\n<\/blockquote>\n\n\n\n
      \n\n\n\n
      \u7136\u540e\u8bfb\u53d6 B \u7ec4\u5355\u8bcd\u5e76\u67e5\u8be2\uff1a<\/p>\n\n\n\n
      for _ in range(m):\n    word = input().strip()\n\n    if word in positions:\n        print(*positions[word])\n    else:\n        print(-1)\n<\/code><\/pre>\n\n\n\n
      \u8fd9\u91cc\u7684 _<\/code> \u8868\u793a\uff1a<\/p>\n\n\n\n
      \n
      \u5faa\u73af m \u6b21\uff0c\u4f46\u6211\u4e0d\u5173\u5fc3\u5f53\u524d\u662f\u7b2c\u51e0\u6b21\u3002<\/p>\n<\/blockquote>\n\n\n\n
      \u5982\u679c\u67e5\u8be2\u7684\u5355\u8bcd\u5728 positions<\/code> \u91cc\u9762\uff0c\u5c31\u8f93\u51fa\u5b83\u7684\u4f4d\u7f6e\u5217\u8868\u3002<\/p>\n\n\n\n
      \u6bd4\u5982\uff1a<\/p>\n\n\n\n
      positions[\"a\"]\n<\/code><\/pre>\n\n\n\n
      \u5f97\u5230\uff1a<\/p>\n\n\n\n
      [1, 2, 4]\n<\/code><\/pre>\n\n\n\n
      \u8fd9\u53e5\uff1a<\/p>\n\n\n\n
      print(*positions[word])\n<\/code><\/pre>\n\n\n\n
      \u4f1a\u628a\u5217\u8868\u5c55\u5f00\u8f93\u51fa\u3002<\/p>\n\n\n\n
      \u4e5f\u5c31\u662f\u8bf4\uff1a<\/p>\n\n\n\n
      print(*[1, 2, 4])\n<\/code><\/pre>\n\n\n\n
      \u6548\u679c\u76f8\u5f53\u4e8e\uff1a<\/p>\n\n\n\n
      print(1, 2, 4)\n<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\uff1a<\/p>\n\n\n\n
      1 2 4\n<\/code><\/pre>\n\n\n\n
      \u5982\u679c\u4e0d\u7528 *<\/code>\uff0c\u76f4\u63a5\u5199\uff1a<\/p>\n\n\n\n
      print(positions[word])\n<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\u4f1a\u53d8\u6210\uff1a<\/p>\n\n\n\n
      [1, 2, 4]\n<\/code><\/pre>\n\n\n\n
      \u8fd9\u4e0d\u7b26\u5408\u9898\u76ee\u8981\u6c42\u3002<\/p>\n\n\n\n
      \n\n\n\n
      \u516d\u3001\u7528\u6837\u4f8b\u5b8c\u6574\u8d70\u4e00\u904d<\/h2>\n\n\n\n
      \u8f93\u5165\uff1a<\/p>\n\n\n\n
      5 2\na\na\nb\na\nb\na\nb\n<\/code><\/pre>\n\n\n\n
      \u7b2c\u4e00\u884c\uff1a<\/p>\n\n\n\n
      n = 5\nm = 2\n<\/code><\/pre>\n\n\n\n
      \u63a5\u4e0b\u6765 5 \u4e2a\u5355\u8bcd\u5c5e\u4e8e A \u7ec4\uff1a<\/p>\n\n\n\n
      a\na\nb\na\nb\n<\/code><\/pre>\n\n\n\n
      \u8bb0\u5f55\u4e4b\u540e\u5f97\u5230\uff1a<\/p>\n\n\n\n
      positions = {\n    \"a\": [1, 2, 4],\n    \"b\": [3, 5]\n}\n<\/code><\/pre>\n\n\n\n
      \u63a5\u4e0b\u6765 2 \u4e2a\u5355\u8bcd\u5c5e\u4e8e B \u7ec4\uff1a<\/p>\n\n\n\n
      a\nb\n<\/code><\/pre>\n\n\n\n
      \u67e5\u8be2 \"a\"<\/code>\uff1a<\/p>\n\n\n\n
      positions[\"a\"] = [1, 2, 4]\n<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\uff1a<\/p>\n\n\n\n
      1 2 4\n<\/code><\/pre>\n\n\n\n
      \u67e5\u8be2 \"b\"<\/code>\uff1a<\/p>\n\n\n\n
      positions[\"b\"] = [3, 5]\n<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\uff1a<\/p>\n\n\n\n
      3 5\n<\/code><\/pre>\n\n\n\n
      \u6700\u7ec8\u8f93\u51fa\uff1a<\/p>\n\n\n\n
      1 2 4\n3 5\n<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      \u4e03\u3001\u5b8c\u6574\u7b54\u6848\u4ee3\u7801<\/h2>\n\n\n\n
      from collections import defaultdict\n\nn, m = map(int, input().split())\n\npositions = defaultdict(list)\n\nfor i in range(1, n + 1):\n    word = input().strip()\n    positions[word].append(i)\n\nfor _ in range(m):\n    word = input().strip()\n\n    if word in positions:\n        print(*positions[word])\n    else:\n        print(-1)\n<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      \u516b\u3001\u5e38\u89c1\u9519\u8bef\u4e0e\u6613\u6df7\u70b9<\/h2>\n\n\n\n
      1. \u4f4d\u7f6e\u7f16\u53f7\u5199\u6210\u4ece 0 \u5f00\u59cb<\/h3>\n\n\n\n
      \u9519\u8bef\u5199\u6cd5\uff1a<\/p>\n\n\n\n
      for i in range(n):\n    word = input().strip()\n    positions[word].append(i)\n<\/code><\/pre>\n\n\n\n
      \u8fd9\u6837\u8bb0\u5f55\u7684\u4f4d\u7f6e\u4f1a\u662f\uff1a<\/p>\n\n\n\n
      0 1 2 3 4\n<\/code><\/pre>\n\n\n\n
      \u4f46\u9898\u76ee\u8981\u6c42\u7684\u662f\uff1a<\/p>\n\n\n\n
      1 2 3 4 5\n<\/code><\/pre>\n\n\n\n
      \u6240\u4ee5\u5e94\u8be5\u5199\uff1a<\/p>\n\n\n\n
      for i in range(1, n + 1):\n<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      2. \u5fd8\u8bb0\u7528 list \u4fdd\u5b58\u591a\u4e2a\u4f4d\u7f6e<\/h3>\n\n\n\n
      \u9519\u8bef\u601d\u8def\uff1a<\/p>\n\n\n\n
      positions[word] = i\n<\/code><\/pre>\n\n\n\n
      \u8fd9\u6837\u53ea\u80fd\u4fdd\u5b58\u6700\u540e\u4e00\u6b21\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002<\/p>\n\n\n\n
      \u6bd4\u5982 a<\/code> \u51fa\u73b0\u4e86 3 \u6b21\uff1a<\/p>\n\n\n\n
      \u7b2c1\u6b21\uff1a1\n\u7b2c2\u6b21\uff1a2\n\u7b2c3\u6b21\uff1a4\n<\/code><\/pre>\n\n\n\n
      \u5982\u679c\u4f60\u5199\uff1a<\/p>\n\n\n\n
      positions[\"a\"] = i\n<\/code><\/pre>\n\n\n\n
      \u6700\u540e\u53ea\u4f1a\u7559\u4e0b\uff1a<\/p>\n\n\n\n
      \"a\": 4\n<\/code><\/pre>\n\n\n\n
      \u524d\u9762\u7684 1<\/code> \u548c 2<\/code> \u4f1a\u88ab\u8986\u76d6\u6389\u3002<\/p>\n\n\n\n
      \u6240\u4ee5\u5fc5\u987b\u7528\u5217\u8868\uff1a<\/p>\n\n\n\n
      positions[word].append(i)\n<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      3. \u76f4\u63a5\u6253\u5370\u5217\u8868\u683c\u5f0f\u4e0d\u5bf9<\/h3>\n\n\n\n
      \u9519\u8bef\u5199\u6cd5\uff1a<\/p>\n\n\n\n
      print(positions[word])\n<\/code><\/pre>\n\n\n\n
      \u8f93\u51fa\u662f\uff1a<\/p>\n\n\n\n
      [1, 2, 4]\n<\/code><\/pre>\n\n\n\n
      \u9898\u76ee\u8981\u6c42\u662f\uff1a<\/p>\n\n\n\n
      1 2 4\n<\/code><\/pre>\n\n\n\n
      \u6240\u4ee5\u53ef\u4ee5\u5199\uff1a<\/p>\n\n\n\n
      print(*positions[word])\n<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      4. \u6ca1\u6709\u5904\u7406\u4e0d\u5b58\u5728\u7684\u5355\u8bcd<\/h3>\n\n\n\n
      \u5982\u679c\u67e5\u8be2\u7684\u5355\u8bcd\u6ca1\u6709\u5728 A \u7ec4\u51fa\u73b0\u8fc7\uff0c\u4e0d\u80fd\u7a7a\u7740\u4e0d\u8f93\u51fa\uff0c\u800c\u662f\u8981\u8f93\u51fa\uff1a<\/p>\n\n\n\n
      -1\n<\/code><\/pre>\n\n\n\n
      \u6240\u4ee5\u5fc5\u987b\u5199\u5224\u65ad\uff1a<\/p>\n\n\n\n
      if word in positions:\n    print(*positions[word])\nelse:\n    print(-1)\n<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      \u4e5d\u3001\u8fd9\u7c7b\u9898\u7684\u901a\u7528\u601d\u8def<\/h2>\n\n\n\n
      \u4ee5\u540e\u4f60\u9047\u5230\u8fd9\u79cd\u9898\uff0c\u53ef\u4ee5\u5148\u95ee\u81ea\u5df1\u4e09\u4e2a\u95ee\u9898\uff1a<\/p>\n\n\n\n
      \u7b2c\u4e00\uff0c\u9898\u76ee\u8981\u4e0d\u8981\u8bb0\u5f55\u201c\u67d0\u4e2a\u4e1c\u897f\u51fa\u73b0\u8fc7\u54ea\u4e9b\u4f4d\u7f6e\u201d\uff1f<\/p>\n\n\n\n
      \u5982\u679c\u8981\uff0c\u90a3\u5c31\u5f88\u9002\u5408\u7528\uff1a<\/p>\n\n\n\n
      \u5b57\u5178 + \u5217\u8868\n<\/code><\/pre>\n\n\n\n
      \u7b2c\u4e8c\uff0c\u662f\u5426\u4f1a\u91cd\u590d\u51fa\u73b0\uff1f<\/p>\n\n\n\n
      \u5982\u679c\u4f1a\u91cd\u590d\u51fa\u73b0\uff0c\u5c31\u4e0d\u80fd\u53ea\u5b58\u4e00\u4e2a\u503c\uff0c\u8981\u5b58\u5217\u8868\u3002<\/p>\n\n\n\n
      \u4f8b\u5982\uff1a<\/p>\n\n\n\n
      \"a\": [1, 2, 4]\n<\/code><\/pre>\n\n\n\n
      \u7b2c\u4e09\uff0c\u540e\u9762\u662f\u4e0d\u662f\u8981\u5feb\u901f\u67e5\u8be2\uff1f<\/p>\n\n\n\n
      \u5982\u679c\u8981\u5feb\u901f\u67e5\u8be2\uff0c\u5c31\u4e0d\u8981\u6bcf\u6b21\u90fd\u4ece\u5934\u904d\u5386 A \u7ec4\uff0c\u800c\u662f\u5148\u5efa\u7acb\u5b57\u5178\u3002<\/p>\n\n\n\n
      \u8fd9\u9053\u9898\u7684\u6838\u5fc3\u601d\u60f3\u5c31\u662f\uff1a<\/p>\n\n\n\n
      \n
      \u5148\u9884\u5904\u7406 A \u7ec4\uff0c\u628a\u6bcf\u4e2a\u5355\u8bcd\u7684\u4f4d\u7f6e\u4fdd\u5b58\u597d\uff1b\u518d\u67e5\u8be2 B \u7ec4\uff0c\u76f4\u63a5\u67e5\u5b57\u5178\u3002<\/p>\n<\/blockquote>\n\n\n\n
      \n\n\n\n
      \u5341\u3001\u7ec3\u4e60<\/h2>\n\n\n\n
      \u7ed9\u4f60\u4e00\u7ec4\u6570\u5b57\uff1a<\/p>\n\n\n\n
      6 3\n10\n20\n10\n30\n20\n10\n10\n20\n40\n<\/code><\/pre>\n\n\n\n
      \u524d 6 \u4e2a\u6570\u5b57\u5c5e\u4e8e A \u7ec4\uff0c\u540e 3 \u4e2a\u6570\u5b57\u5c5e\u4e8e B \u7ec4\u67e5\u8be2\u3002<\/p>\n\n\n\n
      \u8bf7\u4f60\u8f93\u51fa\u6bcf\u4e2a B \u7ec4\u6570\u5b57\u5728 A \u7ec4\u4e2d\u51fa\u73b0\u7684\u4f4d\u7f6e\u3002\u5982\u679c\u6ca1\u6709\u51fa\u73b0\uff0c\u8f93\u51fa -1<\/code>\u3002<\/p>\n\n\n\n
      \u63d0\u793a\uff1a<\/p>\n\n\n\n
        \n
      1. \u4ecd\u7136\u53ef\u4ee5\u4f7f\u7528 defaultdict(list)<\/code><\/li>\n\n\n\n
      2. \u4f4d\u7f6e\u4ecd\u7136\u4ece 1 \u5f00\u59cb<\/li>\n\n\n\n
      3. \u8f93\u5165\u8bfb\u5230\u7684\u662f\u5b57\u7b26\u4e32\uff0c\u5982\u679c\u4f60\u53ea\u6bd4\u8f83\u5185\u5bb9\uff0c\u5176\u5b9e\u53ef\u4ee5\u4e0d\u8f6c\u6210\u6574\u6570<\/li>\n\n\n\n
      4. \u67e5\u8be2 10<\/code> \u65f6\u5e94\u8be5\u80fd\u627e\u5230\u591a\u4e2a\u4f4d\u7f6e<\/li>\n<\/ol>\n\n\n\n
        \u672c\u8d28\u4e0a\u5c31\u662f\u5b57\u5178\u91cc\u9762\u5d4c\u5957\u5217\u8868\uff0c\u4f46\u662f\u7528\u4e86\u7279\u6b8a\u7684\u51fd\u6570\u6765\u5904\u7406\uff0c\u5bf9\u5427\uff1f<\/h2>\n\n\n\n
        \u5bf9\uff0c\u672c\u8d28\u7406\u89e3\u662f\u6b63\u786e\u7684\u3002<\/p>\n\n\n\n
        \u8fd9\u9053\u9898\u7684\u6838\u5fc3\u6570\u636e\u7ed3\u6784\u5c31\u662f\uff1a<\/p>\n\n\n\n
        {\n    \"a\": [1, 2, 4],\n    \"b\": [3, 5]\n}\n<\/code><\/pre>\n\n\n\n
        \u4e5f\u5c31\u662f\uff1a<\/p>\n\n\n\n
        \u5b57\u5178\u91cc\u9762\u7684 key \u662f\u5355\u8bcd\n\u5b57\u5178\u91cc\u9762\u7684 value \u662f\u5217\u8868\n\u5217\u8868\u91cc\u9762\u5b58\u8fd9\u4e2a\u5355\u8bcd\u51fa\u73b0\u8fc7\u7684\u4f4d\u7f6e\n<\/code><\/pre>\n\n\n\n
        \u6240\u4ee5\u53ef\u4ee5\u628a\u5b83\u7406\u89e3\u6210\uff1a<\/p>\n\n\n\n
        \u5b57\u5178\u5d4c\u5957\u5217\u8868\n<\/code><\/pre>\n\n\n\n
        \u66f4\u51c6\u786e\u4e00\u70b9\u8bf4\uff0c\u662f\uff1a<\/p>\n\n\n\n
        \u4e00\u4e2a\u5b57\u5178\uff0c\u6bcf\u4e2a key \u5bf9\u5e94\u4e00\u4e2a\u5217\u8868\n<\/code><\/pre>\n\n\n\n
        defaultdict(list)<\/code> \u53ea\u662f\u5e2e\u4f60\u7701\u6389\u4e86\u201c\u7b2c\u4e00\u6b21\u9047\u5230\u67d0\u4e2a\u5355\u8bcd\u65f6\uff0c\u5148\u624b\u52a8\u521b\u5efa\u7a7a\u5217\u8868\u201d\u7684\u6b65\u9aa4\u3002<\/p>\n\n\n\n
        \u666e\u901a\u5b57\u5178\u5199\u6cd5\u662f\uff1a<\/p>\n\n\n\n
        positions = {}\n\nword = \"a\"\n\nif word not in positions:\n    positions[word] = []\n\npositions[word].append(1)\n<\/code><\/pre>\n\n\n\n
        \u7528\u4e86 defaultdict(list)<\/code> \u4e4b\u540e\uff0c\u53ef\u4ee5\u76f4\u63a5\u5199\uff1a<\/p>\n\n\n\n
        from collections import defaultdict\n\npositions = defaultdict(list)\n\nword = \"a\"\npositions[word].append(1)\n<\/code><\/pre>\n\n\n\n
        \u56e0\u4e3a\u5f53 positions[\"a\"]<\/code> \u8fd8\u4e0d\u5b58\u5728\u65f6\uff0cdefaultdict(list)<\/code> \u4f1a\u81ea\u52a8\u521b\u5efa\uff1a<\/p>\n\n\n\n
        positions[\"a\"] = []\n<\/code><\/pre>\n\n\n\n
        \u7136\u540e\u518d\u6267\u884c\uff1a<\/p>\n\n\n\n
        positions[\"a\"].append(1)\n<\/code><\/pre>\n\n\n\n
        \u6240\u4ee5\u5b83\u4e0d\u662f\u4e00\u79cd\u65b0\u7684\u590d\u6742\u7ed3\u6784\uff0c\u5b83\u672c\u8d28\u4e0a\u8fd8\u662f\u5b57\u5178\uff0c\u53ea\u4e0d\u8fc7\u8fd9\u4e2a\u5b57\u5178\u6709\u4e00\u4e2a\u201c\u9ed8\u8ba4\u503c\u673a\u5236\u201d\u3002<\/p>\n\n\n\n
        \u53ef\u4ee5\u8fd9\u6837\u8bb0\uff1a<\/p>\n\n\n\n
        dict\uff1a\u6ca1\u6709 key\uff0c\u76f4\u63a5\u8bbf\u95ee\u4f1a\u62a5\u9519\ndefaultdict(list)\uff1a\u6ca1\u6709 key\uff0c\u4f1a\u81ea\u52a8\u7ed9\u4f60\u4e00\u4e2a\u7a7a\u5217\u8868 []\n<\/code><\/pre>\n\n\n\n
        \u6240\u4ee5\u8fd9\u9053\u9898\u7684\u6838\u5fc3\u5c31\u662f\uff1a<\/p>\n\n\n\n
        positions[word].append(i)\n<\/code><\/pre>\n\n\n\n
        \u8fd9\u53e5\u8bdd\u53ef\u4ee5\u7ffb\u8bd1\u6210\uff1a<\/p>\n\n\n\n
        \u628a\u5f53\u524d\u5355\u8bcd word \u51fa\u73b0\u7684\u4f4d\u7f6e i\uff0c\u653e\u8fdb\u8fd9\u4e2a\u5355\u8bcd\u5bf9\u5e94\u7684\u4f4d\u7f6e\u5217\u8868\u91cc\u3002\n<\/code><\/pre>\n\n\n\n
        \u6bd4\u5982\u8fde\u7eed\u6267\u884c\uff1a<\/p>\n\n\n\n
        positions[\"a\"].append(1)\npositions[\"a\"].append(2)\npositions[\"a\"].append(4)\n<\/code><\/pre>\n\n\n\n
        \u6700\u540e\u5c31\u662f\uff1a<\/p>\n\n\n\n
        {\n    \"a\": [1, 2, 4]\n}\n<\/code><\/pre>\n\n\n\n
        \u4f60\u73b0\u5728\u7684\u7406\u89e3\u53ef\u4ee5\u603b\u7ed3\u6210\u4e00\u53e5\u8bdd\uff1a<\/p>\n\n\n\n
        \u8fd9\u9053\u9898\u5c31\u662f\u7528\u4e00\u4e2a\u201c\u5355\u8bcd -> \u4f4d\u7f6e\u5217\u8868\u201d\u7684\u5b57\u5178\u6765\u4fdd\u5b58 A \u7ec4\u4fe1\u606f\uff0cdefaultdict(list) \u53ea\u662f\u8ba9\u521b\u5efa\u5217\u8868\u8fd9\u4e00\u6b65\u81ea\u52a8\u5b8c\u6210\u3002\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
        \u8fd9\u9053\u9898\u672c\u8d28\u4e0a\u5728\u8003\u4ec0\u4e48 \u8fd9\u9053\u9898\u8003\u7684\u662f\uff1a\u5982\u4f55\u8bb0\u5f55\u4e00\u4e2a\u5355\u8bcd\u5728 A \u7ec4\u4e2d\u51fa\u73b0\u8fc7\u54ea\u4e9b\u4f4d\u7f6e\uff0c\u7136\u540e\u5feb\u901f\u67e5\u8be2 B \u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5355 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[54],"tags":[],"class_list":["post-2248","post","type-post","status-publish","format-standard","hentry","category-text"],"_links":{"self":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2248","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=2248"}],"version-history":[{"count":1,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2248\/revisions"}],"predecessor-version":[{"id":2250,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/posts\/2248\/revisions\/2250"}],"wp:attachment":[{"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=2248"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=2248"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.preluna.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=2248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}