{"id":229445,"date":"2020-12-12T12:59:13","date_gmt":"2020-12-12T04:59:13","guid":{"rendered":"http:\/\/4563.org\/?p=229445"},"modified":"2020-12-12T12:59:13","modified_gmt":"2020-12-12T04:59:13","slug":"n-%e4%b8%aa%e5%8f%98%e9%87%8f%e9%83%bd%e6%98%af%e5%b8%83%e5%b0%94%e7%b1%bb%e5%9e%8b%e7%9a%84%ef%bc%8c%e6%94%af%e6%8c%81%e7%9a%84%e8%bf%90%e7%ae%97%e6%9c%89%e4%b8%8e%e6%88%96%e5%92%8c%e5%b0%8f%e6%8b%ac","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=229445","title":{"rendered":"n \u4e2a\u53d8\u91cf\u90fd\u662f\u5e03\u5c14\u7c7b\u578b\u7684\uff0c\u652f\u6301\u7684\u8fd0\u7b97\u6709\u4e0e\u6216\u548c\u5c0f\u62ec\u53f7(\u8fd0\u7b97\u4f18\u5148\u7ea7\uff09\uff0c\u80fd\u751f\u6210\u591a\u5c11\u79cd\u8fd0\u7b97\u8868\u8fbe\u5f0f\uff1f"},"content":{"rendered":"
\n
\n
\n

n \u4e2a\u53d8\u91cf\u90fd\u662f\u5e03\u5c14\u7c7b\u578b\u7684\uff0c\u652f\u6301\u7684\u8fd0\u7b97\u6709\u4e0e\u6216\u548c\u5c0f\u62ec\u53f7(\u8fd0\u7b97\u4f18\u5148\u7ea7\uff09\uff0c\u80fd\u751f\u6210\u591a\u5c11\u79cd\u8fd0\u7b97\u8868\u8fbe\u5f0f\uff1f <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : zhoudaiyu <\/span> <\/i> 6<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u6bd4\u5982\u6709 a b c 3 \u4e2a\u53d8\u91cf\uff0c\u5219\u6709<\/p>\n

a and c or b<\/p>\n

(a or b) and c<\/p>\n

.
.
.<\/p>\n

\u8fd9\u79cd\u8868\u8fbe\u5f0f\u600e\u4e48\u7528\u7a0b\u5e8f\u679a\u4e3e\u51fa\u6765\uff1f<\/p>\n<\/p><\/div>\n

\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (16<\/span>) <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : no1xsyzy <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4f60\u6ca1\u6709\u9650\u5b9a\u6761\u4ef6\uff0c\u90a3\u5c31\u4e0d\u53ef\u80fd\u679a\u4e3e\u3002
    \u5148\u5199\u4e00\u4e2a<\/p>\n

    for i in itertools.count():
    \u3000\u3000 print(“a and “*i+”a”) <\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zhoudaiyu <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @no1xsyzy #1 \u4ec0\u4e48\u6837\u7684\u9650\u5b9a\u6761\u4ef6\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : no1xsyzy <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zhoudaiyu \u4ec0\u4e48\u53eb \u201c\u591a\u5c11\u79cd\u201d
    \u4f60\u770b\u770b\u6211\u7684\u4ee3\u7801\uff0c\u53ea\u6709\u4e00\u4e2a\u53d8\u91cf\uff0c\u4e00\u79d2\u751f\u6210\u51e0\u4e07\u79cd\u8fd0\u7b97\u8868\u8fbe\u5f0f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zhoudaiyu <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @no1xsyzy #3 \u4f60\u8fd9\u4e2a\u5c31 1 \u4e2a\u53d8\u91cf \u6211\u7684\u610f\u601d\u662f\u5f97\u591a\u4e2a\u4e0d\u540c\u7684\u53d8\u91cf \u4e0d\u53ef\u91cd\u590d\u7684\u7ec4\u5408 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : Vegetable <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    https:\/\/leetcode-cn.com\/problems\/24-game\/solution\/24-dian-you-xi-by-leetcode-solution\/ <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : imn1 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    abc \u80fd\u5426\u91cd\u590d\u51fa\u73b0\uff1f
    \u80fd\u91cd\u590d\u7684\u8bdd\uff0c\u6700\u591a\u91cd\u590d\u7684\u6b21\u6570\u662f\u591a\u5c11\uff1f
    \u53ef\u4ee5\u65e0\u9650\u6b21\u91cd\u590d\u7684\u8bdd\uff0c\u81ea\u7136\u5c31\u662f\u65e0\u9650\u89e3\uff0c\u5443\uff0c\u7ed3\u679c\u5e94\u8be5\u8fd8\u662f\u6709\u9650\u7684\uff0c\u53ea\u662f\u5199\u6cd5\u65e0\u9650\uff0c <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : shyrock <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5173\u6ce8\uff0c\u8fd0\u7b97\u7b26\u7b80\u5355\u3002\u4f46\u662f\u62ec\u53f7\u6211\u6ca1\u60f3\u6e05\u695a\u600e\u4e48\u5efa\u6a21\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : no1xsyzy <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zhoudaiyu \u6211\u5c31 1 \u4e2a\u53d8\u91cf\u5c31\u65e0\u7a77\u4e86\uff0c\u90a3 n \u4e2a\u53d8\u91cf\u8fd8\u5f97\u4e86\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @no1xsyzy lz \u610f\u601d\u662f n \u4e2a\u4e0d\u540c\u7684\u53d8\u91cf\u5427 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : zhoudaiyu <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    n \u4e2a\u4e0d\u540c\u53d8\u91cf \u53ea\u80fd\u5728\u8868\u8fbe\u5f0f\u51fa\u73b0 1 \u6b21\uff01
    @no1xsyzy
    @imn1 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : zxCoder <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u6709\u4e2a\u66b4\u529b\u7684\u60f3\u6cd5\uff0c\u53d8\u91cf\u548c\u7b26\u53f7\u5148\u7206\u641c\u5b9a\u4e0b\u6765\uff0c\u7136\u540e\u518d\u7206\u641c\u653e\u62ec\u53f7\uff0c\u7136\u540e\u518d\u5224\u65ad\u5408\u6cd5\u6027 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : crclz <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u5df2\u7ecf\u4e00\u5e74\u591a\u6ca1\u78b0 OJ \u4e86…\u82b1\u4e86 10 \u5206\u949f\u60f3\u4e86\u4e2a\u601d\u8def\uff1a<\/p>\n

    \u601d\u8def\uff1a\u8fd9\u4e2a\u95ee\u9898\u95ee\u7684\u662f\uff1a\u201c\u6709\u591a\u5c11\u79cd\u8bed\u6cd5\u6811\u201d\u3002<\/p>\n

    \u9996\u5148\u660e\u786e\u4e00\u4e0b\u9898\u76ee\uff1a\u6709 n \u4e2a\u53d8\u91cf\u3002\u6211\u4eec\u7b80\u5316\u4e00\u4e0b\u9898\u76ee\uff0c\u628a\u53d8\u91cf\u7edf\u4e00\u6362\u6210 i \u3002
    \u8fd9\u6837\uff0c\u6c42\u51fa\u7684\u6700\u7ec8\u7ed3\u679c\u53ea\u9700\u8981\u4e58\u4e0a n \u4e2a\u5143\u7d20\u7684\u5168\u6392\u5217\u6570\u91cf A(n,n)\uff0c\u5c31\u53ef\u4ee5\u5f97\u5230\u6700\u7ec8\u7684\u7b54\u6848\u3002<\/p>\n

    \u7136\u540e\u6211\u4eec\u5bf9\u8bed\u6cd5\u5efa\u6a21\u3002\u8fd9\u4e2a\u6587\u6cd5\u53ef\u4ee5\u7528\u7ecf\u5178\u7684\u8868\u8fbe\u5f0f\u6587\u6cd5\u7a0d\u4f5c\u53d8\u5f62\u5f97\u5230\uff1a
    E -> E op T | T
    T -> i | (E op E) \/\/ \u8fd9\u91cc\u5047\u8bbe\u4e0d\u80fd\u6709(((i)))\u8fd9\u79cd\u5957\u5a03\uff0c\u5426\u5219\u5c31\u65e0\u9650\u79cd\u4e86
    op -> \u4e0e | \u6216<\/p>\n

    \u5982\u679c\u6ca1\u5b66\u8fc7\u6587\u6cd5\uff0c\u53ef\u4ee5\u7528\u76f4\u89c9\u7406\u89e3\uff1a
    \u5982\u679c\u4e00\u4e2a\u5f0f\u5b50\u662f\u201c(i & i) | i\u201d\uff0c
    \u90a3\u4e48\u8fd9\u4e2a\u5f0f\u5b50\u7684\u8bed\u6cd5\u6811\u7684\u63a8\u5bfc\u4e3a\uff1a
    E => E op T => T op T => (E op E) op i => (i op i) op i => (i & i) | i \u3002
    \u6bcf\u4e00\u6b21\u6211\u628a\u4e00\u4e2a\u7b26\u53f7\u6269\u5c55\u7684\u65f6\u5019\uff0c\u5c31\u662f\u5efa\u7acb\u4e00\u4e2a\u5b50\u6811\u7684\u52a8\u4f5c\u3002<\/p>\n

    \u53e6\u5916\uff0c\u53c8\u56e0\u4e3a\u8fd9\u4e2a\u6587\u6cd5\u4e0d\u662f\u4e8c\u4e49\u6587\u6cd5\uff0c\u6240\u4ee5\u5f97\u5230\u7684\u7b54\u6848\u4e0d\u4f1a\u91cd\u590d\u3002<\/p>\n

    \u597d\u4e86\uff0c\u73b0\u5728\u5c31\u5bf9\u8fd9\u4e2a\u6587\u6cd5\u7684\u5efa\u6a21\u5b8c\u6bd5\u4e86\u3002
    \u540c\u65f6\u6ce8\u610f\uff0cop \u53ef\u4ee5\u4e0d\u5c55\u5f00\uff0c\u53ea\u9700\u8981\u5728\u6700\u540e\u5448\u4e0a 2^(\u8fd0\u7b97\u7b26\u4e2a\u6570)\u5c31\u884c\u4e86\u3002<\/p>\n

    >>> \u6211\u4eec\u7684\u4efb\u52a1\u8f6c\u6362\u4e3a\uff1a\u6c42\u6ee1\u8db3\u6761\u4ef6\u7684\u8bed\u6cd5\u6811\u7684\u79cd\u7c7b\u3002\u6761\u4ef6\uff1a\u8bed\u6cd5\u6811\u7684\u53f6\u5b50\u8282\u70b9\u6709 N \u4e2a i \u3002<\/p>\n

    ================= \u5206\u5272\u7ebf<\/p>\n

    \u597d\uff0c\u73b0\u5728\u4e00\u4e2a\u7b28\u529e\u6cd5\u5c31\u662f\uff0c\u7528\u9012\u5f52\uff0c\u5728\u6bcf\u4e2a\u8282\u70b9\uff0c\u90fd\u5bf9\u6240\u6709\u53ef\u80fd\u7684\u5b50\u6811\u505a\u5c1d\u8bd5\u3002\u4f46\u4e0d\u80fd\u65e0\u4f11\u6b62\u7684\u5c1d\u8bd5\uff0c\u5e94\u8be5\u526a\u679d\u3002\u526a\u679d\u7684\u65b9\u6cd5\u5c31\u662f\uff1a\u5982\u679c\u5f53\u524d\u7684 i \u7684\u6570\u91cf\u5927\u4e8e N\uff0c\u90a3\u4e48\u5c31 return \uff08\u526a\u679d\uff09\u3002<\/p>\n

    \u7136\u800c\uff0c\u8fd9\u4e2a\u529e\u6cd5\u65f6\u95f4\u590d\u6742\u5ea6\u6ca1\u6709\u7ecf\u8fc7\u4f18\u5316\u3002<\/p>\n

    \u6211\u4eec\u53ef\u4ee5\u60f3\u5230\u7b2c\u4e8c\u79cd\u65b9\u6cd5\uff1a
    \u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u975e\u7ec8\u7ed3\u7b26\uff08 E, T \uff09\uff0c\u7ef4\u62a4\u4e00\u4e2a\u8868 table\uff1akey=(\u975e\u7ec8\u7ed3\u7b26, i \u7684\u6570\u91cf)\uff0cvalue=\u5b50\u6811\u79cd\u7c7b\u3002
    \u4f8b\u5b50\uff1atable[(‘E’, 5)]=10 \u7684\u610f\u601d\u662f\uff0c\u4ee5 E \u4e3a\u6839\u8282\u70b9\uff0c\u6ee1\u8db3\u201c\u6709 5 \u4e2a i\u201d\u7684\u8bed\u6cd5\u6811\u7684\u6570\u91cf\u4e3a 10.<\/p>\n

    \u73b0\u5728\u5c31\u53ef\u4ee5\u901a\u8fc7 [\u9012\u63a8] \u6765\u89e3\u51b3\u4e86\u3002<\/p>\n

    === <\/p>\n

    \u7531\u4e8e\u601d\u8003\u65f6\u95f4\u77ed\u6682\uff0c\u6587\u6cd5\u7b49\u63a8\u7406\u5982\u679c\u6709\u9519\u8bef\u8bf7\u8c05\u89e3\u3002\uff08\u5927\u4f53\u7684\u601d\u8def\u662f\u53ef\u884c\u7684\uff09 <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : kiracyan <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e00\u79cd\u601d\u8def \u53e3 \u4ee3\u8868\u53d8\u91cf O \u4ee3\u8868\u8fd0\u7b97\u7b26
    \u628a \u8fd9\u4e2a\u8868\u8fbe\u5f0f\u7684 \u53e3 O \u53e3 O \u53e3 \u62ec\u53f7\u53ef\u80fd\u7684\u60c5\u51b5\u5168\u90e8\u8f93\u51fa\u6765 \u7136\u540e\u518d\u505a\u6392\u5217\u7ec4\u5408\u7684\u586b\u7a7a\u4f1a\u7b80\u5355\u5f88\u591a <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : jones2000 <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u4e0d\u5c31\u662f\u4e00\u4e2a\u6392\u5e8f\u7ec4\u5408\u561b\uff0c \u6bd4\u5982 3 \u4e2a\u53d8\u91cf a,b,c or , and ,(,) \u5c31\u8fd9\u51e0\u4e2a\u6570\u6392\u5217\u7ec4\u5408\u6253\u5370\u4e0b\uff0c \u7136\u540e\u628a\u51fa\u6765\u7684\u8868\u8fbe\u5f0f\u7528 \u7f16\u8bd1\u5668\u7f16\u8bd1\u4e0b \u53bb\u6389\u7f16\u8bd1\u9519\u8bef\u8868\u8fbe\u5f0f\uff0c\u7559\u4e0b\u7684\u90fd\u662f\u6b63\u786e\u7684\u3002 <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : no1xsyzy <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    @zhoudaiyu \u4f60\u770b\uff0c\u8fd9\u4e0d\u662f\u5c31\u9650\u5236\u561b
    \u5bf9\uff0c\u6211\u4e0a\u9762\u6401\u7740\u660e\u767d\u88c5\u7cca\u6d82\u5462
    \u7b26\u5408\u4ea4\u6362\u5f8b\u7684\u7b97\u4e0d\u7b97\uff1f a and b \u548c b and a \u662f\u4e0d\u662f\u4e00\u6837\u7684\uff1f
    \u65e0\u6548\u62ec\u53f7\u7b97\u4e0d\u7b97\uff1f(a and b) or c \u548c a and b or c \u662f\u4e0d\u662f\u4e00\u6837\u7684\uff1f <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
    \u8cc7\u6df1\u5927\u4f6c : TomVista <\/span> <\/div>\n
    <\/i> <\/span> <\/div>\n<\/p><\/div>\n
    \u9996\u5148\u6392\u5217 n \u53d8\u91cf\u8fdb\u884c\u6392\u5217
    n!
    \u7136\u540e\u5728\u7f1d\u9699\u4e2d\u63d2\u5165 \u6216\u4e0e
    n! * 2^(n-1)<\/p>\n

    \u7136\u540e\u5728\u6570\u5b57\u540e\u9762\u63d2\u5165 “)”<\/p>\n

    * \u7b2c n \u4e2a\u6570\u5b57\u540e\u9762\u53ef\u4ee5\u63d2\u5165\u6700\u591a (n-1)\u4e2a “)” \u8fd9\u91cc “(\u53d8\u91cf)” \u8fd9\u79cd\u5f62\u5f0f\u89c6\u4e3a\u65e0\u6548
    *\u7b2c n \u4e2a\u6570\u5b57\u53ef\u80fd\u5177\u6709\u7684\u62ec\u53f7\u6392\u5217 2^(n-1)
    \u7b49\u4ef7\u4e3a n-1 \u4e2a”(” \u53ef\u80fd\u5b58\u5728\u53ef\u80fd\u4e0d\u5b58\u5728\u7684\u961f\u5217
    *n \u4e2a\u6570\u5b57\u53ef\u80fd\u5177\u6709\u7684\u62ec\u53f7\u6392\u5217 2^(2-1) *2^(3-1) *…* 2^(n-2) * 2^(n-1)<\/p>\n

    \u7136\u540e\u5f97\u5230 {n! * 2^(n-1)}*{2^(2-1) *2^(3-1) *…* 2^(n-2) * 2^(n-1)} <\/p><\/div>\n<\/p><\/div>\n<\/li>\n

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