{"id":323,"date":"2018-11-04T01:23:06","date_gmt":"2018-11-03T17:23:06","guid":{"rendered":"http:\/\/SmokeyDays.top\/wordpress\/?p=323"},"modified":"2018-11-04T01:23:06","modified_gmt":"2018-11-03T17:23:06","slug":"lp4555-%e5%9b%bd%e5%ae%b6%e9%9b%86%e8%ae%ad%e9%98%9f-%e6%9c%80%e9%95%bf%e5%8f%8c%e5%9b%9e%e6%96%87%e4%b8%b2","status":"publish","type":"post","link":"http:\/\/SmokeyDays.top\/wordpress\/2018\/11\/04\/lp4555-%e5%9b%bd%e5%ae%b6%e9%9b%86%e8%ae%ad%e9%98%9f-%e6%9c%80%e9%95%bf%e5%8f%8c%e5%9b%9e%e6%96%87%e4%b8%b2\/","title":{"rendered":"lp4555 \u56fd\u5bb6\u96c6\u8bad\u961f \u6700\u957f\u53cc\u56de\u6587\u4e32"},"content":{"rendered":"

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\n\u603b\u4e4b\u662f\u9ebb\u8fa3\u70eb\uff08Manacher\uff09\u7684\u6a21\u677f\u9898\u3002<\/p>\n

Manacher\u662f\u4e00\\(O(n)\\)\u79cd\u5904\u7406\u56de\u6587\u5b50\u4e32\u7684\u901a\u7528\u65b9\u6cd5\u3002
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\n\u56e0\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u5206\u522b\u8003\u8651\u7528\u7740\u4e24\u79cd\u60c5\u51b5\uff0c\u4f7f\u5f97\u6211\u4eec\u53ea\u9700\u8981\u53cc\u6307\u9488\u626b\u4e00\u904d\u5373\u53ef\u3002
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\n\u4e0b\u9762\u6211\u4eec\u8003\u8651\u7b2c\u4e8c\u79cd\u60c5\u51b5\u3002
\n\u9996\u5148\uff0c\u5bf9\u4e8e\u5f53\u524d\u70b9\\(i\\)\uff0c\u603b\u662f\u6709\\(i>mid\\)\u3002
\n\u90a3\u4e48\uff0c\u5982\u679c\\(i<mx\\)\uff0c\u90a3\u4e48\u663e\u7136\uff0c\u5728\u5bf9\u79f0\u8f74\u7684\u53e6\u4e00\u8fb9\u7684\u70b9\\(j=mid-(i-mid)\\)\uff0c\u5728\\(mx\\)\u7684\u8303\u56f4\u5185\uff0c\u4e24\u8005\u5fc5\u7136\u662f\u62e5\u6709\u5171\u540c\u7684\u5b50\u4e32\u7684\u3002
\n\u8fd9\u6837\u7b97\u6cd5\u5c31\u8bbe\u8ba1\u5b8c\u4e86\u3002<\/p>\n

\u56e0\u4e3a\u662f\u53cc\u6307\u9488\u79fb\u52a8\uff0c\u6240\u4ee5\u590d\u6742\u5ea6\u662f\u5bf9\u7684\u3002
\n\u7136\u540e\u5462\uff0c\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u4f4d\u7f6e\\(i\\)\uff0c\u6211\u4eec\u8003\u8651\uff0c\u7ef4\u62a4\\(l_{i}\\)\u548c\\(r_{i}\\)\uff0c\u5206\u522b\u8868\u793a\uff0c\\(i\\)\u6240\u5728\u7684\u56de\u6587\u4e32\u4e2d\u6700\u5de6\u7684\u5de6\u7aef\u70b9\u548c\u6700\u53f3\u7684\u53f3\u7aef\u70b9\u3002
\n\u90a3\u4e48\uff0c\\(ans=Max(r_{i}-l_{i})\\)
\n\u5904\u7406\u65b9\u6cd5\u7684\u8bdd\uff0c\u7ef4\u62a4\u4e00\u4e2a\u53cc\u6307\u9488\u5373\u53ef\u3002<\/p>\n

#include\r\n#include\r\n#include\r\nusing namespace std;\r\n#define Max(_A,_B) ((_A)>(_B)?(_A):(_B))\r\n#define Min(_A,_B) ((_A)<(_B)?(_A):(_B))\r\n\r\nint n,f[200005],l[200005],r[200005];\r\nchar ch[100005],s[200005];\r\ninline void manacher(){\r\n\tint mx=0,nw;\r\n\tfor(int i=2;i<=n;++i){\r\n\t\tif(imx){\r\n\t\t\tmx=i+f[i];\r\n\t\t\tnw=i;\r\n\t\t}\r\n\t}\r\n}\r\nvoid init(){\r\n\tcin>>(ch+1);\r\n\tn=strlen(ch+1);\r\n\ts[1]=s[2]='#';\r\n\tfor(int i=1;i<=n;++i){\r\n\t\ts[(i<<1)+1]=ch[i];\r\n\t\ts[(i<<1)+2]='#';\r\n\t}\r\n\tn=(n<<1)+2;\r\n\ts[n+1]=0;\r\n\tmanacher();\r\n\tint nw=1;\r\n\tfor(int i=1;i<=n;++i){\r\n\t\twhile(nw<=i+f[i]-1){\r\n\t\t\tl[nw]=i;\r\n\t\t\t++nw;\r\n\t\t}\r\n\t}\r\n\tnw=n+1;\r\n\tfor(int i=n;i>=1;--i){\r\n\t\twhile(nw>=i-f[i]+1){\r\n\t\t\tr[nw]=i;\r\n\t\t\t--nw;\r\n\t\t}\r\n\t}\r\n\tint ans=0;\r\n\tfor(int i=1;i<=n;++i){\r\n\t\tans=Max(ans,r[i]-l[i]);\r\n\t}\r\n\tprintf(\"%d\\n\",ans);\r\n}\r\nint main(){\r\n\tinit();\r\n\treturn 0;\r\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u4e00\u5f00\u59cb\u4ee5\u4e3a\u662f\u548c\u6700\u957f\u53cc\u500d\u56de\u6587\u4e32\u4e00\u6837\u7684\u9898\uff0c\u4e0d\u8fc7\u4ed4\u7ec6\u770b\u4e00\u4e0b\u53d1\u73b0\u8fd8\u662f\u7b80\u5355\u5f88\u591a\u3002 \u603b\u4e4b\u662f\u9ebb\u8fa3\u70eb\uff08Manacher\uff09\u7684\u6a21\u677f … <\/p>\n
\u7ee7\u7eed\u9605\u8bfb\u201clp4555 \u56fd\u5bb6\u96c6\u8bad\u961f \u6700\u957f\u53cc\u56de\u6587\u4e32\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[17,40,8,6,5,41],"tags":[],"_links":{"self":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts\/323"}],"collection":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/comments?post=323"}],"version-history":[{"count":1,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts\/323\/revisions"}],"predecessor-version":[{"id":324,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/posts\/323\/revisions\/324"}],"wp:attachment":[{"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/media?parent=323"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/categories?post=323"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/SmokeyDays.top\/wordpress\/wp-json\/wp\/v2\/tags?post=323"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}