{"id":163,"date":"2012-08-28T16:21:00","date_gmt":"2012-08-28T08:21:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/64"},"modified":"2012-08-28T16:21:00","modified_gmt":"2012-08-28T08:21:00","slug":"poj_2942_tarjen_point_biconnected_component__cross_staining","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=163","title":{"rendered":"POJ 2942\uff08Tarjen\u7684\u70b9\u53cc\u8fde\u901a\u5206\u91cf+\u4ea4\u53c9\u67d3\u8272\u6cd5\uff09"},"content":{"rendered":"

\u8fd9\u9898\u662f\u70b9\u53cc\u8fde\u901a\u5206\u91cf\uff0c\u6211\u4e00\u5f00\u59cb\u5199\u6210\u8fb9\u7684\u2026\u2026<\/p>\n

\u9996\u5148\u70b9\u53cc\u8fde\u901a\u5206\u91cf\u53ef\u80fd\u91cd\u53e0\u2026\u2026(1,2) (2,3) (3,1) (3,4) (4,5) (5,6) (3.6)<\/p>\n

\u8fd9\u65f6\u6709\uff081\uff0c2\uff0c3\uff09\u548c\uff083\uff0c4\uff0c5\uff0c6\uff09\u4e24\u7ec4\u53cc\u8fde\u901a\u5206\u91cf<\/p>\n

\u6545\u4e00\u5b9a\u8981\u5728Tarjen\u91cc\u5224\u2026\u2026\u53e6\u5916Stack\u5b58\u8fb9\u65f6\u6ce8\u610f\u7279\u5224(Stack\u4e0d\u80fd\u4e3a\u7a7a\uff09<\/p>\n

\u5f53dfs[k]<=low[i] \u65f6 \u5c31\u627e\u5230\u4e86\u70b9\u53cc\u8fde\u901a\u5206\u91cf \uff08\u8fd9\u662f\u70b9\u53cc\u8fde\u901a\uff09<\/p>\n

\u8bf7\u6ce8\u610f\u5728\u63a8\u9001\uff08k\uff0ci\uff09\u540e\u904d\u5386\u5f97\u5230\u7684\u4e00\u5806\u8fb9(\u5305\u62ec\uff08k\uff0ci\uff09)\u7ec4\u6210\u4e86\u4e00\u7ec4\u70b9\u53cc\u8fde\u901a\u5206\u91cf<\/p>\n

\u4e24\u4e2a\u91cd\u8981\u5b9a\u7406\uff1a<\/p>\n<\/p>\n

\n\uff081\uff09       \u5982\u679c\u4e00\u4e2a\u53cc\u8fde\u901a\u5206\u91cf\u5185\u7684\u67d0\u4e9b\u9876\u70b9\u5728\u4e00\u4e2a\u5947\u5708\u4e2d\uff08\u5373\u53cc\u8fde\u901a\u5206\u91cf\u542b\u6709\u5947\u5708\uff09\uff0c\u90a3\u4e48\u8fd9\u4e2a\u53cc\u8fde\u901a\u5206\u91cf\u7684\u5176\u4ed6\u9876\u70b9\u4e5f\u5728\u67d0\u4e2a\u5947\u5708\u4e2d\uff1b<\/p>\n

\n\uff082\uff09       \u5982\u679c\u4e00\u4e2a\u53cc\u8fde\u901a\u5206\u91cf\u542b\u6709\u5947\u5708\uff0c\u5219\u4ed6\u5fc5\u5b9a\u4e0d\u662f\u4e00\u4e2a\u4e8c\u5206\u56fe\u3002\u53cd\u8fc7\u6765\u4e5f\u6210\u7acb\uff0c\u8fd9\u662f\u4e00\u4e2a\u5145\u8981\u6761\u4ef6\u3002<\/p>\n

<\/p>\n

Program P2942;\nconst\n   maxn=1050;\n   maxm=1000000;\nVar\n   n,m,i,j,x,y:longint;\n   b:array[1..maxn,1..maxn] of boolean;\n\n   color,c,dfs,low:array[1..maxn] of longint;\n\n   attend,flag:array[1..maxn] of boolean;\n\n   size,time,totssc:longint;\n\n   stack:array[0..maxm,1..2] of longint;\n\nfunction min(a,b:longint):longint;\nbegin\n   if a<b then exit(a) else exit(b);\nend;\nfunction is_Binary(k,col:longint):boolean;\nvar\n   i,j:longint;\nbegin\n   color[k]:=col;\n   for i:=1 to n do\n      if (flag[i]) and (b[k,i]) then\n      begin\n         if color[i]=0 then\n         begin\n            if not(is_binary(i,3-col)) then exit(false);\n         end\n         else\n         if color[k]=color[i] then exit(false);\n      end;\n\n   exit(true);\nend;\n\nprocedure tarjen(k,father:longint);\nvar\n   i,j:longint;\nbegin\n   inc(time);\n   dfs[k]:=time;\n   low[k]:=time;\n\n   c[k]:=1;\n   for i:=1 to n do\n      if (b[k,i]) and (dfs[k]>dfs[i]) and (i<>father) then\n      begin\n         if dfs[i]=0 then\n         begin\n\n         inc(size);\n         stack[size,1]:=k;\n         stack[size,2]:=i;\n\n\n\n         tarjen(i,k);\n         low[k]:=min(low[k],low[i]);\n\n         if dfs[k]<=low[i] then\n         begin\n            fillchar(flag,sizeof(flag),false);\n            fillchar(color,sizeof(color),false);\n            while (size>0) do\n            begin\n               flag[stack[size,1]]:=true;\n               flag[stack[size,2]]:=true;\n               dec(size);\n               if (stack[size+1,1]=k) and (stack[size+1,2]=i) then break;\n\n            end;\n\n            if not(is_binary(k,1)) then\n            begin\n               for j:=1 to n do\n                  if flag[j] then attend[j]:=true;\n\n\n            end;\n\n\n         end;\n\n\n         end\n         else\n         if c[i]=1 then low[k]:=min(low[k],dfs[i]);\n      end;\n\n\n\n\n\n   c[k]:=2;\n\nend;\n\n\nfunction main:longint;\nvar\n   i,j,tot:longint;\nbegin\n   fillchar(dfs,sizeof(dfs),0);\n   fillchar(low,sizeof(low),0);\n   fillchar(c,sizeof(c),0);\n   fillchar(attend,sizeof(attend),false);\n   fillchar(flag,sizeof(flag),false);\n   fillchar(color,sizeof(color),0);\n   fillchar(stack,sizeof(stack),0);\n   size:=0;time:=0;\n   for i:=1 to n do\n      if (dfs[i]=0) then\n      begin\n          tarjen(i,0);\n      end;\n\n   tot:=0;\n   for i:=1 to n do if attend[i] then inc(tot);\n   exit(n-tot);\n\nend;\n\nbegin\n   while not seekeof do\n   begin\n      read(n,m);\n      if (n=0) and (m=0) then break;\n      fillchar(b,sizeof(b),true);\n      for i:=1 to n do b[i,i]:=false;\n      for i:=1 to m do\n      begin\n         read(x,y);\n         b[x,y]:=false;\n         b[y,x]:=false;\n      end;\n      writeln(main);\n   end;\nend.\n<\/pre><\/p>\n","protected":false},"excerpt":{"rendered":"
\u8fd9\u9898\u662f\u70b9\u53cc\u8fde\u901a\u5206\u91cf\uff0c\u6211\u4e00\u5f00\u59cb\u5199\u6210\u8fb9\u7684\u2026\u2026 \u9996\u5148\u70b9\u53cc\u8fde\u901a\u5206\u91cf\u53ef\u80fd\u91cd\u53e0\u2026\u2026(1,2) (2,3) (3,1) (3 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":""},"categories":[3],"tags":[119],"class_list":["post-163","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-connected_graph"],"yoast_head":"\nPOJ 2942\uff08Tarjen\u7684\u70b9\u53cc\u8fde\u901a\u5206\u91cf+\u4ea4\u53c9\u67d3\u8272\u6cd5\uff09 - nike0good<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/nike0good.com\/?p=163\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"POJ 2942\uff08Tarjen\u7684\u70b9\u53cc\u8fde\u901a\u5206\u91cf+\u4ea4\u53c9\u67d3\u8272\u6cd5\uff09 - nike0good\" \/>\n<meta property=\"og:description\" content=\"\u8fd9\u9898\u662f\u70b9\u53cc\u8fde\u901a\u5206\u91cf\uff0c\u6211\u4e00\u5f00\u59cb\u5199\u6210\u8fb9\u7684\u2026\u2026 \u9996\u5148\u70b9\u53cc\u8fde\u901a\u5206\u91cf\u53ef\u80fd\u91cd\u53e0\u2026\u2026(1,2) (2,3) (3,1) (3 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/nike0good.com\/?p=163\" \/>\n<meta property=\"og:site_name\" content=\"nike0good\" \/>\n<meta property=\"article:published_time\" content=\"2012-08-28T08:21:00+00:00\" \/>\n<meta name=\"author\" content=\"nike0good\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"nike0good\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=163#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=163\"},\"author\":{\"name\":\"nike0good\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/#\\\/schema\\\/person\\\/4defa38da89de87e400861e73396baad\"},\"headline\":\"POJ 2942\uff08Tarjen\u7684\u70b9\u53cc\u8fde\u901a\u5206\u91cf+\u4ea4\u53c9\u67d3\u8272\u6cd5\uff09\",\"datePublished\":\"2012-08-28T08:21:00+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=163\"},\"wordCount\":26,\"commentCount\":0,\"keywords\":[\"\u8fde\u901a\u56fe\"],\"articleSection\":[\"DefaultCategory\"],\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/nike0good.com\\\/?p=163#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=163\",\"url\":\"https:\\\/\\\/nike0good.com\\\/?p=163\",\"name\":\"POJ 2942\uff08Tarjen\u7684\u70b9\u53cc\u8fde\u901a\u5206\u91cf+\u4ea4\u53c9\u67d3\u8272\u6cd5\uff09 - nike0good\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/#website\"},\"datePublished\":\"2012-08-28T08:21:00+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/#\\\/schema\\\/person\\\/4defa38da89de87e400861e73396baad\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=163#breadcrumb\"},\"inLanguage\":\"zh-Hans\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/nike0good.com\\\/?p=163\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/?p=163#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/nike0good.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"POJ 2942\uff08Tarjen\u7684\u70b9\u53cc\u8fde\u901a\u5206\u91cf+\u4ea4\u53c9\u67d3\u8272\u6cd5\uff09\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/#website\",\"url\":\"https:\\\/\\\/nike0good.com\\\/\",\"name\":\"nike0good\",\"description\":\"\u6709\u6240\u4f5c\u4e3a\u662f\u4eba\u751f\u7684\u6700\u9ad8\u5883\u754c\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/nike0good.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"zh-Hans\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/nike0good.com\\\/#\\\/schema\\\/person\\\/4defa38da89de87e400861e73396baad\",\"name\":\"nike0good\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"zh-Hans\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/8e5fa08d5c367a1a6fb5ff13bb10ed5a331f981513256951290ae42322da6854?s=96&d=identicon&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/8e5fa08d5c367a1a6fb5ff13bb10ed5a331f981513256951290ae42322da6854?s=96&d=identicon&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/8e5fa08d5c367a1a6fb5ff13bb10ed5a331f981513256951290ae42322da6854?s=96&d=identicon&r=g\",\"caption\":\"nike0good\"},\"sameAs\":[\"https:\\\/\\\/nike0good.com\"],\"url\":\"https:\\\/\\\/nike0good.com\\\/?author=1\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"POJ 2942\uff08Tarjen\u7684\u70b9\u53cc\u8fde\u901a\u5206\u91cf+\u4ea4\u53c9\u67d3\u8272\u6cd5\uff09 - nike0good","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/nike0good.com\/?p=163","og_locale":"zh_CN","og_type":"article","og_title":"POJ 2942\uff08Tarjen\u7684\u70b9\u53cc\u8fde\u901a\u5206\u91cf+\u4ea4\u53c9\u67d3\u8272\u6cd5\uff09 - nike0good","og_description":"\u8fd9\u9898\u662f\u70b9\u53cc\u8fde\u901a\u5206\u91cf\uff0c\u6211\u4e00\u5f00\u59cb\u5199\u6210\u8fb9\u7684\u2026\u2026 \u9996\u5148\u70b9\u53cc\u8fde\u901a\u5206\u91cf\u53ef\u80fd\u91cd\u53e0\u2026\u2026(1,2) (2,3) (3,1) (3 […]","og_url":"https:\/\/nike0good.com\/?p=163","og_site_name":"nike0good","article_published_time":"2012-08-28T08:21:00+00:00","author":"nike0good","twitter_card":"summary_large_image","twitter_misc":{"\u4f5c\u8005":"nike0good","\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4":"2 \u5206"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/nike0good.com\/?p=163#article","isPartOf":{"@id":"https:\/\/nike0good.com\/?p=163"},"author":{"name":"nike0good","@id":"https:\/\/nike0good.com\/#\/schema\/person\/4defa38da89de87e400861e73396baad"},"headline":"POJ 2942\uff08Tarjen\u7684\u70b9\u53cc\u8fde\u901a\u5206\u91cf+\u4ea4\u53c9\u67d3\u8272\u6cd5\uff09","datePublished":"2012-08-28T08:21:00+00:00","mainEntityOfPage":{"@id":"https:\/\/nike0good.com\/?p=163"},"wordCount":26,"commentCount":0,"keywords":["\u8fde\u901a\u56fe"],"articleSection":["DefaultCategory"],"inLanguage":"zh-Hans","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/nike0good.com\/?p=163#respond"]}]},{"@type":"WebPage","@id":"https:\/\/nike0good.com\/?p=163","url":"https:\/\/nike0good.com\/?p=163","name":"POJ 2942\uff08Tarjen\u7684\u70b9\u53cc\u8fde\u901a\u5206\u91cf+\u4ea4\u53c9\u67d3\u8272\u6cd5\uff09 - nike0good","isPartOf":{"@id":"https:\/\/nike0good.com\/#website"},"datePublished":"2012-08-28T08:21:00+00:00","author":{"@id":"https:\/\/nike0good.com\/#\/schema\/person\/4defa38da89de87e400861e73396baad"},"breadcrumb":{"@id":"https:\/\/nike0good.com\/?p=163#breadcrumb"},"inLanguage":"zh-Hans","potentialAction":[{"@type":"ReadAction","target":["https:\/\/nike0good.com\/?p=163"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/nike0good.com\/?p=163#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/nike0good.com\/"},{"@type":"ListItem","position":2,"name":"POJ 2942\uff08Tarjen\u7684\u70b9\u53cc\u8fde\u901a\u5206\u91cf+\u4ea4\u53c9\u67d3\u8272\u6cd5\uff09"}]},{"@type":"WebSite","@id":"https:\/\/nike0good.com\/#website","url":"https:\/\/nike0good.com\/","name":"nike0good","description":"\u6709\u6240\u4f5c\u4e3a\u662f\u4eba\u751f\u7684\u6700\u9ad8\u5883\u754c","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/nike0good.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"zh-Hans"},{"@type":"Person","@id":"https:\/\/nike0good.com\/#\/schema\/person\/4defa38da89de87e400861e73396baad","name":"nike0good","image":{"@type":"ImageObject","inLanguage":"zh-Hans","@id":"https:\/\/secure.gravatar.com\/avatar\/8e5fa08d5c367a1a6fb5ff13bb10ed5a331f981513256951290ae42322da6854?s=96&d=identicon&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/8e5fa08d5c367a1a6fb5ff13bb10ed5a331f981513256951290ae42322da6854?s=96&d=identicon&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/8e5fa08d5c367a1a6fb5ff13bb10ed5a331f981513256951290ae42322da6854?s=96&d=identicon&r=g","caption":"nike0good"},"sameAs":["https:\/\/nike0good.com"],"url":"https:\/\/nike0good.com\/?author=1"}]}},"_links":{"self":[{"href":"https:\/\/nike0good.com\/index.php?rest_route=\/wp\/v2\/posts\/163","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nike0good.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nike0good.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nike0good.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nike0good.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=163"}],"version-history":[{"count":0,"href":"https:\/\/nike0good.com\/index.php?rest_route=\/wp\/v2\/posts\/163\/revisions"}],"wp:attachment":[{"href":"https:\/\/nike0good.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=163"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nike0good.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=163"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nike0good.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=163"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}