{"id":166,"date":"2012-08-31T15:22:00","date_gmt":"2012-08-31T07:22:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/67"},"modified":"2012-08-31T15:22:00","modified_gmt":"2012-08-31T07:22:00","slug":"poj_1830_bit_operations__two-way_dfs","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=166","title":{"rendered":"POJ 1830\uff08\u4f4d\u8fd0\u7b97+\u53cc\u5411DFS\uff09"},"content":{"rendered":"<p>\u6b64\u9898\u4e5f\u53ef\u7528GE\u505a\uff0c\u53ef\u662f\u6211\u4e0d\u4f1a\u77e9\u9635\u4e58\u6cd5\u2026\u2026<\/p>\n<p>\n<\/p>\n<p><pre name=\"code\" class=\"delphi\">Program P1830;\nconst\n   maxn=28;\n   maxf=100007;\n   none=-2139062144;\nvar\n   ans,tt,n,i,j,s,t,mid:longint;\n   b:array[1..29] of longint;\n   h,num:array[0..maxf] of longint;\n\nfunction hash(x:longint):longint;\nvar\n   i,j:longint;\nbegin\n   hash:=x mod maxf;\n   while (num[hash]&lt;&gt;x) and (num[hash]&lt;&gt;none) do\n   begin\n      hash:=(hash+1) mod maxf;\n   end;\n   num[hash]:=x;\n   exit(hash);\nend;\nprocedure dfs(x,l:longint);\nvar\n   i,j:longint;\nbegin\n   if l=mid+1 then\n   begin\n      inc(h[hash(x)]);\n      exit;\n   end;\n   for i:=l to mid do\n      dfs(x xor b[i],i+1);\n   dfs(x,mid+1);\n\nend;\nprocedure find(x,l:longint);\nvar\n   i,j:longint;\nbegin\n   if l=n+1 then\n   begin\n      inc(ans,h[hash(x)]);\n      exit;\n   end;\n   for i:=l to n do\n      find(x xor b[i],i+1);\n   find(x,n+1);\n\nend;\n\nbegin\n   read(tt);\n   while (tt&gt;0) do\n   begin\n      ans:=0;\n      fillchar(b,sizeof(b),0);\n      fillchar(num,sizeof(num),128);\n      fillchar(h,sizeof(h),0);\n\n      read(n);\n      s:=0;\n      for i:=1 to n do\n      begin\n         read(j);\n         if j=1 then inc(s,1 shl (i-1));\n      end;\n      t:=0;\n      for i:=1 to n do\n      begin\n         read(j);\n         if j=1 then inc(t,1 shl (i-1));\n      end;\n      while (true) do\n      begin\n         read(i,j);\n         if (i=0) and (j=0) then break;\n         inc(b[i],1 shl (j-1));\n      end;\n      for i:=1 to n do inc(b[i],1 shl (i-1));\n      mid:=n shr 1;\n      dfs(s,1);\n      find(t,mid+1);\n      if ans=0 then writeln('Oh,it''s impossible~!!') else\n      writeln(ans);\n      dec(tt);\n   end;\nend.\n<\/pre><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6b64\u9898\u4e5f\u53ef\u7528GE\u505a\uff0c\u53ef\u662f\u6211\u4e0d\u4f1a\u77e9\u9635\u4e58\u6cd5\u2026\u2026 Program P1830; const maxn=28; maxf [&hellip;]<\/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":[80],"class_list":["post-166","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-search"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>POJ 1830\uff08\u4f4d\u8fd0\u7b97+\u53cc\u5411DFS\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=166\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"POJ 1830\uff08\u4f4d\u8fd0\u7b97+\u53cc\u5411DFS\uff09 - nike0good\" \/>\n<meta property=\"og:description\" content=\"\u6b64\u9898\u4e5f\u53ef\u7528GE\u505a\uff0c\u53ef\u662f\u6211\u4e0d\u4f1a\u77e9\u9635\u4e58\u6cd5\u2026\u2026 Program P1830; 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