{"id":550,"date":"2012-08-05T12:01:00","date_gmt":"2012-08-05T04:01:00","guid":{"rendered":"http:\/\/nike0good.jp1.rpvhost.net\/7"},"modified":"2012-08-05T12:01:00","modified_gmt":"2012-08-05T04:01:00","slug":"poj_2152_tree-dp","status":"publish","type":"post","link":"https:\/\/nike0good.com\/?p=550","title":{"rendered":"POJ 2152(\u6811\u5f62DP)"},"content":{"rendered":"<p>\u8fd9\u9898\u544a\u8bc9\u6211\u4e00\u4e2a\u9053\u7406\uff1a\u6570\u7ec4\u5f00\u5f97\u592a\u5c0f\u4f1a\u51fa\u73b0<span style=\"color:rgb(255,0,0); font-family:'Times New Roman',Times,serif; font-size:14px\">Time Limit Exceeded<\/span><\/p>\n<p style=\"text-align:left\"><span style=\"font-family:'Times New Roman',Times,serif; font-size:14px\">\u8a00\u5f52\u6b63\u4f20\uff1a\u8fd9\u9898\u7684DP\u65b9\u7a0b\u662ff[x,i]:=w[i]&#43;\u2211(best[y],f[y,i]-w[i]) &nbsp; \/\/f[x,i]\u6307 x \u7684\u4f9b\u5e94\u7ad9\u4e3a i \u65f6\uff0cx\u5b50\u6811\u5168\u53d6\u7684\u6700\u5c0f\u4ee3\u4ef7<\/span><\/p>\n<p style=\"text-align:left\"><span style=\"font-family:'Times New Roman',Times,serif; font-size:14px\">best[y]\u8868\u793amin(best[y,i]) \u9884\u5904\u7406<\/span><\/p>\n<p style=\"text-align:left\"><span style=\"font-family:'Times New Roman',Times,serif; font-size:14px\">y\u4e3ax\u7684\u513f\u5b50<\/span><\/p>\n<p style=\"text-align:left\"><span style=\"font-family:'Times New Roman',Times,serif; font-size:14px\">\u5982\u679cx\u7684\u5b50\u6811\u6709\u91cd\u53e0\u7684\u4f9b\u5e94\u7ad9\uff0c\u90a3\u4e48\u8fd9\u4e2a\u4f9b\u5e94\u7ad9\u53ea\u80fd\u662fx\u7684\u4f9b\u5e94\u7ad9i<\/span><\/p>\n<p style=\"text-align:left\"><span style=\"font-family:'Times New Roman',Times,serif; font-size:14px\">\u591a\u53c9\u6811\u53ef\u4ee5\u7528\u8fb9\u8868\u5b58\u7684\uff08\u96be\u9053\u6811\u5f62DP=DFS\uff1f\uff09<\/span><\/p>\n<p style=\"text-align:left\"><span style=\"font-family:'Times New Roman',Times,serif; font-size:14px\">\u300a\u4e00\u5f20\u4e00\u5f1b,\u89e3\u9898\u4e4b\u9053\u2014\u2014\u201c\u7ea6\u5236\u3001\u653e\u5bbd\u201d\u65b9\u6cd5\u5728\u89e3\u9898\u4e2d\u7684\u5e94\u7528\u300b<\/span><\/p>\n<p style=\"text-align:left\"><span style=\"font-family:'Times New Roman',Times,serif; font-size:14px\"><a href=\"http:\/\/www.doc88.com\/p-670874250550.html\">http:\/\/www.doc88.com\/p-670874250550.html<\/a><br \/>\n<\/span><\/p>\n<p style=\"text-align:left\">\n<\/p>\n<p style=\"text-align:left\">\n<pre name=\"code\" class=\"delphi\">Program p2152;\nvar\n   t,n,i,j,u,v,w2,tot,root,father:longint;\n   d,w,best,dis:array[1..2000] of longint;\n   head,tail,edge,we:array[1..2000] of longint;\n   f:array[1..1000,1..1000] of longint;\nfunction min(a,b:longint):longint;\nbegin\n   if a&lt;b then exit(a) else exit(b);\nend;\nprocedure addedge(u,v,w:longint);\nvar\n   i,j:longint;\nbegin\n   inc(tot);\n   we[tot]:=w;\n   edge[tot]:=v;\n   tail[tot]:=head[u];\n   head[u]:=tot;\nend;\nprocedure calcdis(x:longint);\nvar\n   i,p:longint;\nbegin\n   p:=head[x];\n   while (p&lt;&gt;0) do\n   begin\n      if (dis[edge[p]]=-1) then\n      begin\n         dis[edge[p]]:=dis[x]+we[p];\n         calcdis(edge[p]);\n      end;\n      p:=tail[p];\n   end;\nend;\nprocedure dfs(x,fa:longint);\nvar\n   i,j,p:longint;\nbegin\n   best[x]:=maxlongint;\n   p:=head[x];\n   while (p&lt;&gt;0) do\n   begin\n      if (edge[p]&lt;&gt;fa) then dfs(edge[p],x);\n      p:=tail[p];\n   end;\n   for i:=1 to n do dis[i]:=-1;\n   dis[x]:=0;\n\n   calcdis(x);\n\n\n   for i:=1 to n do\n   begin\n      if (dis[i]&gt;d[x]) then f[x,i]:=maxlongint\n      else\n      begin\n         f[x,i]:=w[i];\n         p:=head[x];\n         while (p&lt;&gt;0) do\n         begin\n            if (edge[p]&lt;&gt;fa) then inc(f[x,i],min(best[edge[p]],f[edge[p],i]-w[i]));\n            p:=tail[p];\n         end;\n         best[x]:=min(best[x],f[x,i]);\n\n\n\n\n      end;\n\n\n   end;\nend;\nbegin\n   read(t);\n   while t&gt;0 do\n   begin\n      tot:=0;\n      fillchar(head,sizeof(head),0);\n      fillchar(tail,sizeof(tail),0);\n\n      read(n);\n      for i:=1 to n do read(w[i]);\n      for i:=1 to n do read(d[i]);\n      for i:=1 to n-1 do begin read(u,v,w2); addedge(u,v,w2); addedge(v,u,w2); end;\n\n      root:=1;\n      dfs(1,-1);\n      writeln(best[root]);\n\n      dec(t);\n   end;\nend.<\/pre>\n<\/p>\n<p style=\"text-align:left\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u9898\u544a\u8bc9\u6211\u4e00\u4e2a\u9053\u7406\uff1a\u6570\u7ec4\u5f00\u5f97\u592a\u5c0f\u4f1a\u51fa\u73b0Time Limit Exceeded \u8a00\u5f52\u6b63\u4f20\uff1a\u8fd9\u9898\u7684DP\u65b9\u7a0b\u662ff[x [&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":[93],"class_list":["post-550","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-tree_dp"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>POJ 2152(\u6811\u5f62DP) - 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=550\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"POJ 2152(\u6811\u5f62DP) 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