{"id":102,"date":"2019-02-22T19:27:56","date_gmt":"2019-02-22T11:27:56","guid":{"rendered":"http:\/\/fankasy.xyz\/?p=102"},"modified":"2019-03-28T16:44:02","modified_gmt":"2019-03-28T08:44:02","slug":"%e5%ad%a6%e4%b9%a0%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%8403-kmp%e7%ae%97%e6%b3%95","status":"publish","type":"post","link":"http:\/\/fankasy.xyz\/index.php\/2019\/02\/22\/%e5%ad%a6%e4%b9%a0%e6%95%b0%e6%8d%ae%e7%bb%93%e6%9e%8403-kmp%e7%ae%97%e6%b3%95\/","title":{"rendered":"\u5b66\u4e60\u6570\u636e\u7ed3\u67843-KMP\u7b97\u6cd5"},"content":{"rendered":"\r\n

\u8fd9\u662f\u4e00\u4e2a\u6539\u8fdb\u7684\u5b57\u7b26\u4e32\u5339\u914d\u7b97\u6cd5\uff0c\u63d0\u4f9b\u66f4\u5feb\u7684\u5173\u952e\u8bcd\u641c\u7d22\u529f\u80fd\u3002\u4ecb\u7ecd\u8fd9\u4e2a\u53ef\u4ee5\u4ece\u5206\u6790\u6211\u4eec\u8089\u773c\u67e5\u627e\u5173\u952e\u8bcd\u65f6\u7684\u505a\u6cd5\u505a\u8d77\u3002<\/p>\r\n\r\n\r\n\r\n

\u8fd9\u513f\u6709\u4e00\u4e2a\u4e32\u4e32\uff0c\u5047\u8bbe\u6211\u4eec\u8981\u627e\u5230\u5173\u952e\u8bcdabababca\uff0c\u5c31\u662f\u4e0b\u9762\u90a3\u4e00\u884c\u73a9\u610f<\/span><\/p>\r\n

ABABAB<\/span>A<\/span>BCA<\/span><\/b><\/p>\r\n

ABAB<\/span><\/b>ABC<\/span>A<\/span><\/b><\/p>\r\n

\u7ecf\u8fc7\u89c2\u5bdf\u53d1\u73b0\uff0c\u5728\u5339\u914d\u4f4d\u7f6e(<\/span>\u6807\u7ea2)<\/span>\u51fa\u95ee\u9898\u524d\u4e00\u5171\u67096<\/span>\u4e2a\u5b57\u7b26\u5339\u914d\u6210\u529f\uff0c\u8fd9\u516d\u4e2a\u5b57\u7b26\u7ec4\u6210\u7684\u5b57\u7b26\u4e32\u5728\u539f\u4e32\u548c\u6a21\u5f0f\u4e32\u4e2d\u662f\u4e00\u6837\u7684 \u800c\u4e14\u8fd9\u4e2a\u4e32\u201cABABAB<\/span>\u201d\u6709\u4e00\u4e2a\u7279\u70b9\uff0c\u5b83\u7684\u524d4<\/span>\u4e2a\u5b57\u7b26\u548c\u540e4<\/span>\u4e2a\u5b57\u7b26\u662f\u4e00\u6837\u7684\uff0c\u56e0\u6b64\u4e0b\u4e00\u6b21\u5339\u914d\u7684\u65f6\u5019,<\/span>\u53ef\u4ee5\u7565\u53bb\u524d\u56db\u4e2a\u5b57\u7b26(<\/span>\u6807\u84dd)<\/span>\u76f4\u63a5\u4ece\u7b2c\u4e94\u4f4d\u5f00\u59cb\u5339\u914d<\/p>\r\n

\u4e5f\u5c31\u662f\u8bf4\uff0c\u4e0b\u4e00\u6b21\u5339\u914d\u521d\u59cb\u4f4d\u7f6e = \u91cd\u590d\u4e32\u957f\u5ea6\u503c + 1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \uff08\u6ce8\u610f\uff0c\u539f\u4e32\u4e2d\u5339\u914d\u4f4d\u7f6e\u4e0d\u4f1a\u53d1\u751f\u53d8\u5316\uff09
<\/span><\/strong><\/p>\r\n

ABABAB<\/span>A<\/span>BCA<\/span><\/b><\/p>\r\n

\u00a0\u00a0\u00a0\u00a0\u00a0 ABAB<\/span><\/b>A<\/span><\/b>BC<\/span>A<\/span><\/b><\/p>\r\n

\u53ef\u4ee5\u53d1\u73b0\uff0c\u5982\u679c\u77e5\u9053\u5728\u67d0\u5b57\u7b26\u5931\u914d\u524d\u543b\u5408\u7684\u5b57\u7b26\u4e32<\/span><\/strong>\u4e2d\uff0c\u9996\u5c3e\u6709\u591a\u957f\u7684\u90e8\u5206\u662f\u91cd\u590d\u7684\uff0c\u90a3\u5c31\u53ef\u4ee5\u8282\u7ea6\u5927\u91cf\u7684\u5339\u914d\u65f6\u95f4 \u66f4\u5feb\u52a0\u5165\u6e38\u620f<\/s><\/p>\r\n

\u9488\u5bf9\u8fd9\u4e2a\u95ee\u9898\uff0c\u53ef\u4ee5\u5efa\u7acb\u4e00\u4e2a\u4e00\u7ef4\u6570\u7ec4\u6765\u5b58\u50a8\uff0c\u4ee5\u5728\u5339\u914d\u65f6\u76f4\u63a5\u8bfb\u53d6\u6570\u636e\u3002\u626b\u63cf\u601d\u8def\u5f88\u7b80\u5355\uff0c\u6bcf\u6b21\u9519\u5f00\u4e00\u4f4d\u548c\u81ea\u5df1\u5339\u914d\uff0c\u5339\u914d\u6210\u529f\u591a\u957f\u5c31\u662f\u91cd\u590d\u4e86\u591a\u5c11\u4f4d\u3002\u5177\u4f53\u8fc7\u7a0b\u53c2\u8003\u4e0b\u5934\u7684\u56fe\uff1a\u5176\u4e2dnext<\/span>\u6570\u7ec4\u5b58\u50a8 \u201c\u6700\u957f\u76f8\u7b49\u7684\u524d\u7f00\u548c\u540e\u7f00\u5b50\u4e32\u201d \"\"<\/span><\/p>\r\n

 <\/p>\r\n

\u5e94\u8be5\u6ce8\u610f\u5230\u4e86next<\/span>\u7684\u5143\u7d20\u7f16\u53f7\u4f3c\u4e4e\u540e\u79fb\u4e86\u4e00\u4f4d\u5427\uff1f\u56de\u5934\u770b\u770b\u7eff\u5b57<\/span><\/strong>\u5c31\u80fd\u7406\u89e3\u4e86\u3002\u4e3a\u4e86\u65b9\u4fbf\u8d77\u89c1\uff0cnext<\/span>\u6570\u7ec4\u7684\u9996\u4f4d\u5373next[0]\u624b\u52a8\u8bbe\u7f6e\u4e3a\u4e3a-1<\/span>\uff0c\u8868\u793a\u7b2c\u4e00\u4f4d\u5c31\u5931\u53bb\u540c\u6b65\u7684\u60c5\u51b5\u3002\u8fd9\u6837\u5728\u5339\u914d\u7684\u65f6\u5019\uff0c\u53ea\u8981\u5728\u67d0\u4e00\u4f4d\u51fa\u73b0\u4e0d\u5339\u914d\uff0c\u5c06\u8fd9\u4e2a\u503c\u4ee3\u5165next[]\u5c31\u53ef\u4ee5\u77e5\u9053\u4e0b\u4e00\u6b21\u5339\u914d\u4ece\u7b2c\u51e0\u4f4d\u5f00\u59cb\u3002<\/p>\r\n

\u4e0b\u9762\u8d34\u51fa\u6211\u5728\u53c2\u8003\u4e86\u4e00\u4e9b\u5176\u4ed6\u4ee3\u7801\u540e\u5199\u51fa\u7684\u62d9\u52a3\u4ee3\u7801\uff0c\u7528\u4ee5\u5b9e\u73b0\u5bf9\u7ed9\u51fa\u7684\u5173\u952e\u8bcd\u4e32\u6c42\u51fanext\u6570\u7ec4\uff1a<\/p>\r\n


void Ne_xt(char* msc, int* next)

{
\u00a0\u00a0 int i = 0, j = -1;
\u00a0\u00a0 next[0] = -1;
\u00a0\u00a0 while( i < strlen(msc) )
\u00a0\u00a0 \u00a0 \u00a0\u00a0 {\u00a0\u00a0 if( msc[i] == msc[j] || j == -1 )
\u00a0 \u00a0\u00a0\u00a0 \u00a0 \u00a0 \u00a0\u00a0\u00a0\u00a0 { i++; j++; next[i]=j; }
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0\u00a0 else
 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0 { j=next[j]; } 
       \/*\u6ce8\u610f\u8fd9\u4e8b\u5b9e\u4e0a\u5df2\u7ecf\u5e94\u7528\u4e86KMP\u7b97\u6cd5\u7684\u601d\u8def\u8fdb\u884c\u81ea\u6211\u5339\u914d\uff0cj\u7684\u4f4d\u7f6e\u5c31\u662f\u5931\u914d\u70b9\u524d\u7684\u4f4d\u7f6e\uff0cnext[j]\u5373\u662f\u83b7\u53d6\u4ece\u5f00\u5934\u7b97\u8d77\u6709\u591a\u5c11\u91cd\u590d\u7684\u5b57\u7b26\uff0c\u800c
\u7531\u4e8e\u6570\u7ec4\u4ece0\u5f00\u59cb\u6807\u53f7\uff0cnext[j]\u672c\u8eab\u80fd\u591f\u4ee3\u8868\u91cd\u590d\u90e8\u5206\u7684\u4e0b\u4e00\u4f4d\u5373\u7b2c(j+1)\u4e2a\u5b57\u7b26\u7684\u60c5\u51b5\u3002 *\/<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 }
}

<\/pre>\r\n
\u5728\u5f97\u5230\u4e86next\u6570\u7ec4\u4e4b\u540e\uff0c\u7b97\u6cd5\u7684\u5173\u952e\u5df2\u7ecf\u89e3\u51b3\u3002\u63a5\u4e0b\u6765\u7f16\u5199\u53e6\u4e00\u7a0b\u5e8f\u5b9e\u73b0KMP\u7b97\u6cd5\uff0c\u5728\u5b9e\u9645\u4f7f\u7528\u65f6\u4f1a\u8c03\u7528Ne_xt\u51fd\u6570\u3002<\/p>\r\n
int KMP(char* A, char* B)
\/\/\u8f93\u5165\u4e24\u4e2a\u5b57\u7b26\u4e32\u6307\u9488\uff0c\u8fd4\u56de\u9996\u5b57\u7b26\u4f4d\u7f6e\uff0c-1\u4e3a\u4e0d\u5b58\u5728<\/span>
{
   int i=0, j=0;
   int next[strlen(B)];
   Ne_xt(B,next);
   while( i<strlen(A) && j<strlen(B) )
   {
      if( A[i] == B[j] || j == -1 )
        { i++; j++; }
      else
        { j = next[j]; } 
   }

      if( j == strlen(B) )
         return i-j; \/\/\u6210\u529f\u8fd4\u56de\u76ee\u6807\u9996\u5b57\u7b26\u4f4d\u7f6e<\/span>
      else
         return -1;  \/\/\u5931\u8d25\u8fd4\u56de-1
}<\/pre>\r\n
 <\/p>\r\n
 <\/p>\r\n","protected":false},"excerpt":{"rendered":"
\u8fd9\u662f\u4e00\u4e2a\u6539\u8fdb\u7684\u5b57\u7b26\u4e32\u5339\u914d\u7b97\u6cd5\uff0c\u63d0\u4f9b\u66f4\u5feb\u7684\u5173\u952e\u8bcd\u641c\u7d22\u529f\u80fd\u3002\u4ecb\u7ecd\u8fd9\u4e2a\u53ef\u4ee5\u4ece\u5206\u6790\u6211\u4eec\u8089\u773c\u67e5\u627e\u5173\u952e\u8bcd\u65f6\u7684\u505a\u6cd5\u505a\u8d77\u3002 \u8fd9 […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5,10],"tags":[],"_links":{"self":[{"href":"http:\/\/fankasy.xyz\/index.php\/wp-json\/wp\/v2\/posts\/102"}],"collection":[{"href":"http:\/\/fankasy.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/fankasy.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/fankasy.xyz\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/fankasy.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=102"}],"version-history":[{"count":0,"href":"http:\/\/fankasy.xyz\/index.php\/wp-json\/wp\/v2\/posts\/102\/revisions"}],"wp:attachment":[{"href":"http:\/\/fankasy.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=102"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/fankasy.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=102"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/fankasy.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}