{"id":3610,"date":"2019-07-05T20:13:07","date_gmt":"2019-07-05T12:13:07","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=3610"},"modified":"2019-07-05T20:13:07","modified_gmt":"2019-07-05T12:13:07","slug":"%e8%b7%b3%e8%b7%83%e8%a1%a8%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/3610","title":{"rendered":"\u8df3\u8dc3\u8868\u539f\u7406"},"content":{"rendered":"

\u539f\u6587\u5730\u5740<\/a><\/p>\n

<\/div>\n
\n
\n

\u00a0 \u00a0 \u00a0\u00a0\u6700\u8fd1\u770b\u4e86\u4e00\u79cd\u6570\u636e\u7ed3\u6784\u53eb\u505askipList\uff0credis\u548clevelDB\u90fd\u662f\u7528\u4e86\u5b83\u3002Skip List\u662f\u5728\u6709\u5e8f\u94fe\u8868\u7684\u57fa\u7840\u4e0a\u8fdb\u884c\u4e86\u6269\u5c55\uff0c\u89e3\u51b3\u4e86\u6709\u5e8f\u94fe\u8868\u7ed3\u6784\u67e5\u627e\u7279\u5b9a\u503c\u56f0\u96be\u7684\u95ee\u9898\uff0c\u67e5\u627e\u7279\u5b9a\u503c\u7684\u65f6\u95f4\u590d\u6742\u5ea6\u4e3aO(logn)\uff0c\u4ed6\u662f\u4e00\u79cd\u53ef\u4ee5\u4ee3\u66ff\u5e73\u8861\u6811\u7684\u6570\u636e\u7ed3\u6784\u3002<\/p>\n

 <\/p>\n

\u4e0b\u9762\u662fskipList\u7684\u4e00\u4e2a\u4ecb\u7ecd\uff0c\u8f6c\u8f7d\u6765\u7684\uff0c\u6e90\u5730\u5740\uff1ahttp:\/\/kenby.iteye.com\/blog\/1187303<\/a>\uff0c\u4e3a\u9632\u6b62\u6e90\u5730\u5740\u4e22\u5931\uff0c\u6545\u62f7\u8d1d\u4e00\u4efd\u653e\u5728\u8fd9\u91cc\uff0c\u671b\u4f5c\u8005\u539f\u8c05\u3002<\/p>\n

\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u8f6c\u8f7d\u5f00\u59cb\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014<\/strong><\/p>\n

\u4e3a\u4ec0\u4e48\u9009\u62e9\u8df3\u8868<\/h2>\n

\u76ee\u524d\u7ecf\u5e38\u4f7f\u7528\u7684\u5e73\u8861\u6570\u636e\u7ed3\u6784\u6709\uff1aB\u6811\uff0c\u7ea2\u9ed1\u6811\uff0cAVL\u6811\uff0cSplay Tree, Treep\u7b49\u3002<\/p>\n

 <\/p>\n

\u60f3\u8c61\u4e00\u4e0b\uff0c\u7ed9\u4f60\u4e00\u5f20\u8349\u7a3f\u7eb8\uff0c\u4e00\u53ea\u7b14\uff0c\u4e00\u4e2a\u7f16\u8f91\u5668\uff0c\u4f60\u80fd\u7acb\u5373\u5b9e\u73b0\u4e00\u9897\u7ea2\u9ed1\u6811\uff0c\u6216\u8005AVL\u6811<\/p>\n

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 <\/p>\n

\u7528\u8df3\u8868\u5427\uff0c\u8df3\u8868\u662f\u4e00\u79cd\u968f\u673a\u5316\u7684\u6570\u636e\u7ed3\u6784\uff0c\u76ee\u524d\u5f00\u6e90\u8f6f\u4ef6 Redis \u548c LevelDB \u90fd\u6709\u7528\u5230\u5b83\uff0c<\/p>\n

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\u5c31\u80fd\u8f7b\u677e\u5b9e\u73b0\u4e00\u4e2a SkipList\u3002<\/p>\n

 <\/p>\n

\u6709\u5e8f\u8868\u7684\u641c\u7d22<\/h2>\n

\u8003\u8651\u4e00\u4e2a\u6709\u5e8f\u8868\uff1a<\/p>\n

\"\"<\/p>\n

 <\/p>\n

\u4ece\u8be5\u6709\u5e8f\u8868\u4e2d\u641c\u7d22\u5143\u7d20 < 23, 43, 59 > \uff0c\u9700\u8981\u6bd4\u8f83\u7684\u6b21\u6570\u5206\u522b\u4e3a < 2, 4, 6 >\uff0c\u603b\u5171\u6bd4\u8f83\u7684\u6b21\u6570<\/p>\n

\u4e3a 2 + 4 + 6 = 12 \u6b21\u3002\u6709\u6ca1\u6709\u4f18\u5316\u7684\u7b97\u6cd5\u5417? \u00a0\u94fe\u8868\u662f\u6709\u5e8f\u7684\uff0c\u4f46\u4e0d\u80fd\u4f7f\u7528\u4e8c\u5206\u67e5\u627e\u3002\u7c7b\u4f3c\u4e8c\u53c9<\/p>\n

\u641c\u7d22\u6811\uff0c\u6211\u4eec\u628a\u4e00\u4e9b\u8282\u70b9\u63d0\u53d6\u51fa\u6765\uff0c\u4f5c\u4e3a\u7d22\u5f15\u3002\u5f97\u5230\u5982\u4e0b\u7ed3\u6784\uff1a<\/p>\n

\"\"<\/p>\n

\u8fd9\u91cc\u6211\u4eec\u628a < 14, 34, 50, 72 > \u63d0\u53d6\u51fa\u6765\u4f5c\u4e3a\u4e00\u7ea7\u7d22\u5f15\uff0c\u8fd9\u6837\u641c\u7d22\u7684\u65f6\u5019\u5c31\u53ef\u4ee5\u51cf\u5c11\u6bd4\u8f83\u6b21\u6570\u4e86\u3002<\/p>\n

\u6211\u4eec\u8fd8\u53ef\u4ee5\u518d\u4ece\u4e00\u7ea7\u7d22\u5f15\u63d0\u53d6\u4e00\u4e9b\u5143\u7d20\u51fa\u6765\uff0c\u4f5c\u4e3a\u4e8c\u7ea7\u7d22\u5f15\uff0c\u53d8\u6210\u5982\u4e0b\u7ed3\u6784\uff1a<\/p>\n

 <\/p>\n

\"\"<\/p>\n

 <\/p>\n

\u8fd9\u91cc\u5143\u7d20\u4e0d\u591a\uff0c\u4f53\u73b0\u4e0d\u51fa\u4f18\u52bf\uff0c\u5982\u679c\u5143\u7d20\u8db3\u591f\u591a\uff0c\u8fd9\u79cd\u7d22\u5f15\u7ed3\u6784\u5c31\u80fd\u4f53\u73b0\u51fa\u4f18\u52bf\u6765\u4e86\u3002<\/p>\n

 <\/p>\n

\u8df3\u8868<\/h2>\n

\u4e0b\u9762\u7684\u7ed3\u6784\u662f\u5c31\u662f\u8df3\u8868\uff1a<\/p>\n

\u5176\u4e2d -1 \u8868\u793a INT_MIN\uff0c \u94fe\u8868\u7684\u6700\u5c0f\u503c\uff0c1 \u8868\u793a INT_MAX\uff0c\u94fe\u8868\u7684\u6700\u5927\u503c\u3002<\/p>\n

 <\/p>\n

\"\"<\/p>\n

 <\/p>\n

\u8df3\u8868\u5177\u6709\u5982\u4e0b\u6027\u8d28\uff1a<\/p>\n

(1) \u7531\u5f88\u591a\u5c42\u7ed3\u6784\u7ec4\u6210<\/p>\n

(2) \u6bcf\u4e00\u5c42\u90fd\u662f\u4e00\u4e2a\u6709\u5e8f\u7684\u94fe\u8868<\/p>\n

(3) \u6700\u5e95\u5c42(Level 1)\u7684\u94fe\u8868\u5305\u542b\u6240\u6709\u5143\u7d20<\/p>\n

(4) \u5982\u679c\u4e00\u4e2a\u5143\u7d20\u51fa\u73b0\u5728 Level i \u7684\u94fe\u8868\u4e2d\uff0c\u5219\u5b83\u5728 Level i \u4e4b\u4e0b\u7684\u94fe\u8868\u4e5f\u90fd\u4f1a\u51fa\u73b0\u3002<\/p>\n

(5) \u6bcf\u4e2a\u8282\u70b9\u5305\u542b\u4e24\u4e2a\u6307\u9488\uff0c\u4e00\u4e2a\u6307\u5411\u540c\u4e00\u94fe\u8868\u4e2d\u7684\u4e0b\u4e00\u4e2a\u5143\u7d20\uff0c\u4e00\u4e2a\u6307\u5411\u4e0b\u9762\u4e00\u5c42\u7684\u5143\u7d20\u3002<\/p>\n

 <\/p>\n

\u8df3\u8868\u7684\u641c\u7d22<\/h2>\n

\"\"<\/p>\n

 <\/p>\n

\u4f8b\u5b50\uff1a\u67e5\u627e\u5143\u7d20 117<\/p>\n

(1) \u6bd4\u8f83 21\uff0c \u6bd4 21 \u5927\uff0c\u5f80\u540e\u9762\u627e<\/p>\n

(2) \u6bd4\u8f83 37, \u00a0 \u6bd4 37\u5927\uff0c\u6bd4\u94fe\u8868\u6700\u5927\u503c\u5c0f\uff0c\u4ece 37 \u7684\u4e0b\u9762\u4e00\u5c42\u5f00\u59cb\u627e<\/p>\n

(3) \u6bd4\u8f83 71, \u00a0\u6bd4 71 \u5927\uff0c\u6bd4\u94fe\u8868\u6700\u5927\u503c\u5c0f\uff0c\u4ece 71 \u7684\u4e0b\u9762\u4e00\u5c42\u5f00\u59cb\u627e<\/p>\n

(4) \u6bd4\u8f83 85\uff0c \u6bd4 85 \u5927\uff0c\u4ece\u540e\u9762\u627e<\/p>\n

(5) \u6bd4\u8f83 117\uff0c \u7b49\u4e8e 117\uff0c \u627e\u5230\u4e86\u8282\u70b9\u3002<\/p>\n

 <\/p>\n

\u5177\u4f53\u7684\u641c\u7d22\u7b97\u6cd5\u5982\u4e0b\uff1a<\/p>\n

 <\/p>\n

\n
\n
C\u4ee3\u7801\u00a0 \u00a0\"\u6536\u85cf\u4ee3\u7801\"<\/a><\/div>\n<\/div>\n
    \n
  1. \/*\u00a0\u5982\u679c\u5b58\u5728\u00a0x,\u00a0\u8fd4\u56de\u00a0x\u00a0\u6240\u5728\u7684\u8282\u70b9\uff0c\u00a0<\/span><\/li>\n
  2. \u00a0*\u00a0\u5426\u5219\u8fd4\u56de\u00a0x\u00a0\u7684\u540e\u7ee7\u8282\u70b9\u00a0*\/\u00a0\u00a0<\/span><\/li>\n
  3. find(x)<\/li>\n
  4. {<\/li>\n
  5. \u00a0\u00a0\u00a0\u00a0p\u00a0=\u00a0top;<\/li>\n
  6. \u00a0\u00a0\u00a0\u00a0while\u00a0(1)\u00a0{\u00a0\u00a0<\/span><\/li>\n
  7. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0while\u00a0(p->next->key\u00a0<\u00a0x)\u00a0\u00a0<\/span><\/li>\n
  8. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0p\u00a0=\u00a0p->next;<\/li>\n
  9. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if\u00a0(p->down\u00a0==\u00a0NULL)\u00a0\u00a0\u00a0<\/span><\/li>\n
  10. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0p->next;\u00a0\u00a0<\/span><\/li>\n
  11. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0p\u00a0=\u00a0p->down;<\/li>\n
  12. \u00a0\u00a0\u00a0\u00a0}<\/li>\n
  13. }<\/li>\n<\/ol>\n<\/div>\n

     <\/p>\n

     <\/p>\n

    \u8df3\u8868\u7684\u63d2\u5165<\/h2>\n

    \u5148\u786e\u5b9a\u8be5\u5143\u7d20\u8981\u5360\u636e\u7684\u5c42\u6570 K\uff08\u91c7\u7528\u4e22\u786c\u5e01\u7684\u65b9\u5f0f\uff0c\u8fd9\u5b8c\u5168\u662f\u968f\u673a\u7684\uff09<\/p>\n

    \u7136\u540e\u5728 Level 1 … Level K \u5404\u4e2a\u5c42\u7684\u94fe\u8868\u90fd\u63d2\u5165\u5143\u7d20\u3002<\/p>\n

    \u4f8b\u5b50\uff1a\u63d2\u5165 119\uff0c K = 2<\/p>\n

    \"\"<\/p>\n

     <\/p>\n

    \u5982\u679c K \u5927\u4e8e\u94fe\u8868\u7684\u5c42\u6570\uff0c\u5219\u8981\u6dfb\u52a0\u65b0\u7684\u5c42\u3002<\/p>\n

    \u4f8b\u5b50\uff1a\u63d2\u5165 119\uff0c K = 4<\/p>\n

    \"\"<\/p>\n

    <\/h2>\n

    \u4e22\u786c\u5e01\u51b3\u5b9a K<\/h2>\n

    \u63d2\u5165\u5143\u7d20\u7684\u65f6\u5019\uff0c\u5143\u7d20\u6240\u5360\u6709\u7684\u5c42\u6570\u5b8c\u5168\u662f\u968f\u673a\u7684\uff0c\u901a\u8fc7\u4e00\u4e0b\u968f\u673a\u7b97\u6cd5\u4ea7\u751f\uff1a<\/p>\n

     <\/p>\n

    \n
    \n
    C\u4ee3\u7801\u00a0 \u00a0\"\u6536\u85cf\u4ee3\u7801\"<\/a><\/div>\n<\/div>\n
      \n
    1. int\u00a0random_level()\u00a0\u00a0<\/span><\/li>\n
    2. {<\/li>\n
    3. \u00a0\u00a0\u00a0\u00a0K\u00a0=\u00a01;<\/li>\n
    4. <\/li>\n
    5. \u00a0\u00a0\u00a0\u00a0while\u00a0(random(0,1))\u00a0\u00a0<\/span><\/li>\n
    6. \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0K++;<\/li>\n
    7. <\/li>\n
    8. \u00a0\u00a0\u00a0\u00a0return\u00a0K;\u00a0\u00a0<\/span><\/li>\n
    9. }<\/li>\n<\/ol>\n<\/div>\n

       <\/p>\n

      \u76f8\u5f53\u4e0e\u505a\u4e00\u6b21\u4e22\u786c\u5e01\u7684\u5b9e\u9a8c\uff0c\u5982\u679c\u9047\u5230\u6b63\u9762\uff0c\u7ee7\u7eed\u4e22\uff0c\u9047\u5230\u53cd\u9762\uff0c\u5219\u505c\u6b62\uff0c<\/p>\n

      \u7528\u5b9e\u9a8c\u4e2d\u4e22\u786c\u5e01\u7684\u6b21\u6570 K \u4f5c\u4e3a\u5143\u7d20\u5360\u6709\u7684\u5c42\u6570\u3002\u663e\u7136\u968f\u673a\u53d8\u91cf K \u6ee1\u8db3\u53c2\u6570\u4e3a p = 1\/2 \u7684\u51e0\u4f55\u5206\u5e03\uff0c<\/p>\n

      K \u7684\u671f\u671b\u503c E[K] = 1\/p = 2. \u5c31\u662f\u8bf4\uff0c\u5404\u4e2a\u5143\u7d20\u7684\u5c42\u6570\uff0c\u671f\u671b\u503c\u662f 2 \u5c42\u3002<\/p>\n

       <\/p>\n

       <\/p>\n

      \u8df3\u8868\u7684\u9ad8\u5ea6\u3002<\/h2>\n

      n \u4e2a\u5143\u7d20\u7684\u8df3\u8868\uff0c\u6bcf\u4e2a\u5143\u7d20\u63d2\u5165\u7684\u65f6\u5019\u90fd\u8981\u505a\u4e00\u6b21\u5b9e\u9a8c\uff0c\u7528\u6765\u51b3\u5b9a\u5143\u7d20\u5360\u636e\u7684\u5c42\u6570 K\uff0c<\/p>\n

      \u8df3\u8868\u7684\u9ad8\u5ea6\u7b49\u4e8e\u8fd9\u00a0n \u6b21\u5b9e\u9a8c\u4e2d\u4ea7\u751f\u7684\u6700\u5927 K\uff0c\u5f85\u7eed\u3002\u3002\u3002<\/p>\n

       <\/p>\n

      \u8df3\u8868\u7684\u7a7a\u95f4\u590d\u6742\u5ea6\u5206\u6790<\/h2>\n

      \u6839\u636e\u4e0a\u9762\u7684\u5206\u6790\uff0c\u6bcf\u4e2a\u5143\u7d20\u7684\u671f\u671b\u9ad8\u5ea6\u4e3a 2\uff0c \u4e00\u4e2a\u5927\u5c0f\u4e3a n \u7684\u8df3\u8868\uff0c\u5176\u8282\u70b9\u6570\u76ee\u7684<\/p>\n

      \u671f\u671b\u503c\u662f 2n\u3002<\/p>\n

       <\/p>\n

      \u8df3\u8868\u7684\u5220\u9664<\/h2>\n

      \u5728\u5404\u4e2a\u5c42\u4e2d\u627e\u5230\u5305\u542b x \u7684\u8282\u70b9\uff0c\u4f7f\u7528\u6807\u51c6\u7684 delete from list \u65b9\u6cd5\u5220\u9664\u8be5\u8282\u70b9\u3002<\/p>\n

      \u4f8b\u5b50\uff1a\u5220\u9664 71<\/p>\n

      \"\"<\/p>\n

       <\/p>\n

      \u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u8f6c\u8f7d\u7ed3\u675f\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014<\/strong><\/p>\n

      \u968f\u673a\u7684\u5c42\u9ad8level-\u76f8\u5173\u8d44\u6599<\/strong><\/p>\n

      http:\/\/blog.csdn.net\/kisimple\/article\/details\/38706729<\/strong><\/p>\n

      http:\/\/blog.csdn.net\/unix21\/article\/details\/10197115<\/strong><\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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