{"id":130,"date":"2012-08-10T12:02:00","date_gmt":"2012-08-10T04:02:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/16"},"modified":"2012-08-10T12:02:00","modified_gmt":"2012-08-10T04:02:00","slug":"poj_1308_decision_tree","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=130","title":{"rendered":"POJ 1308\uff08\u6811\u7684\u5224\u5b9a\uff09"},"content":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u6709\u5411\u56fe\uff0c\u95ee\u8fd9\u662f\u4e0d\u662f\u6811\uff1f<\/p>\n<p>\u5404\u79cd\u5224\u2026\u2026<\/p>\n<p>\u51fa\u73b02\u6761\u76f8\u540c\u7684\u8fb9\u4e0d\u662f\u6811\uff0c\u81ea\u5df1\u6307\u5411\u81ea\u5df1\u4e0d\u662f\u6811\uff0c\u9664\u6839\u8282\u70b9\u5165\u5ea6\u4e3a0\u5916\u5176\u5b83\u70b9\u5165\u5ea6\u5fc5\u987b\u4e3a1\uff0c\u68ee\u6797\uff0c\u73af\u90fd\u4e0d\u662f\u6811\u2026\u2026<\/p>\n<p>\n<\/p>\n<p><pre name=\"code\" class=\"delphi\">program P1308;\nconst\n   maxn=15;\nVar\n   i,j:longint;\n   b:array[1..maxn,1..maxn] of boolean;\n   indegree:array[1..maxn] of longint;\n   bo:array[1..maxn] of boolean;\n   queue:array[1..maxn+10] of longint;\nprocedure skip;\nvar\n   x,y:longint;\nbegin\n   repeat\n      read(x,y);\n   until (x=0) and (y=0);\nend;\nfunction main:longint;\nvar\n   i,j,k,x,y,root,node:longint;\nbegin\n   read(x,y);\n   if (x=-1) and (y=-1) then exit(-1);\n   if (x=0) and (y=0) then exit(1);\n   while (x&gt;0) and (y&gt;0) do\n   begin\n      if b[x,y] or b[y,x] or (x=y) or (indegree[y]=1) then\n      begin\n         skip;\n         exit(0);\n      end;\n      b[x,y]:=true;\n      bo[x]:=true;bo[y]:=true;\n      inc(indegree[y]);\n      read(x,y);\n   end;\n   root:=0;\n   node:=0;\n   for i:=1 to maxn do\n   begin\n      if bo[i] then inc(node);\n      if (indegree[i]=0) and bo[i] then\n      begin\n         if root=0 then root:=i else exit(0);\n      end;\n   end;\n   if (root=0) then exit(0);\n   i:=1;j:=1;\n   queue[1]:=root;\n   bo[root]:=false;\n   while i&lt;=j do\n   begin\n      for k:=1 to maxn do\n         if b[queue[i],k] then\n         begin\n            if not(bo[k]) then exit(0);\n            bo[k]:=false;\n            inc(j);\n            queue[j]:=k;\n         end;\n      inc(i);\n   end;\n   if (j&lt;&gt;node) then exit(0);\n   exit(1);\nend;\nbegin\n   i:=1;\n   while (true) do\n   begin\n      fillchar(indegree,sizeof(indegree),0);\n      fillchar(b,sizeof(b),0);\n      fillchar(bo,sizeof(bo),0);\n      j:=main;\n      if j=1 then writeln('Case ',i,' is a tree.')\n      else if j=0 then writeln('Case ',i,' is not a tree.')\n      else break;\n      inc(i);\n   end;\nend.\n<\/pre>\n<\/p>\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u5b9a\u4e00\u4e2a\u6709\u5411\u56fe\uff0c\u95ee\u8fd9\u662f\u4e0d\u662f\u6811\uff1f \u5404\u79cd\u5224\u2026\u2026 \u51fa\u73b02\u6761\u76f8\u540c\u7684\u8fb9\u4e0d\u662f\u6811\uff0c\u81ea\u5df1\u6307\u5411\u81ea\u5df1\u4e0d\u662f\u6811\uff0c\u9664\u6839\u8282\u70b9\u5165\u5ea6\u4e3a0\u5916\u5176\u5b83 [&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":[65],"class_list":["post-130","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-graph_theory"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - 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