\u54ea\u4e3a\u670b\u53cb\u5e2e\u6211\u770b\u770b\u591a\u5173\u952e\u5b57\u6392\u5e8f\u54ea\u513f\u9519\u4e86\u2026\u2026<\/p>\n
\n<\/p>\n
Program P1018;\ntype\n product=record\n b,id:longint;\n p:longint;\n end;\nvar\n t,n,i,j,total,count,maxb,mintb,price:longint;\n visit:array[1..100] of longint;\n m:array[1..100] of longint;\n a:array[1..100000] of product;\n ans:double;\nfunction max(a,b:longint):longint;\nbegin\n if a<b then exit(b) else exit(a);\nend;\nfunction min(a,b:longint):longint;\nbegin\n if a>b then exit(b) else exit(a);\nend;\n\nprocedure qsort(l,r:longint);\nvar\n i,j:longint;\n m,p:product;\nbegin\n i:=l;\n j:=r;\n m:=a[(l+r) div 2];\n repeat\n while a[i].b<m.b do inc(i);\n \/\/ while (a[i].p<m.p) and (a[i].b=m.b) do inc(i);\n \/\/ while (a[i].id<m.id) and (a[i].b=m.b) and (a[i].p=m.p) do inc(i);\n\n while a[j].b>m.b do dec(j);\n\/\/ while (a[j].p>m.p) and (a[j].b=m.b) do dec(j);\n\/\/ while (a[j].id>m.id) and (a[j].b=m.b) and (a[j].p=m.p) do dec(j);\n if i<=j then\n begin\n p:=a[i];\n a[i]:=a[j];\n a[j]:=p;\n inc(i);dec(j);\n end;\n\n\n until i>j;\n if l<j then qsort(l,j);\n if i<r then qsort(i,r);\nend;\nbegin\n { assign(input,'p1018.in');\n assign(output,'p1018.out');\n reset(input);\n rewrite(output);\n }read(t);\n\n while t>0 do\n begin\n total:=0;\n read(n);\n mintb:=maxlongint;\n for i:=1 to n do\n begin\n read(m[i]);\n maxb:=0;\n for j:=1 to m[i] do\n begin\n inc(total);\n a[total].id:=i;\n read(a[total].b,a[total].p);\n maxb:=max(a[total].b,maxb);\n end;\n mintb:=min(maxb,mintb);\n end;\n qsort(1,total);\n ans:=0;\n for i:=1 to total-n+1 do\n begin\n if a[i].b>mintb then break;\n count:=0;\n fillchar(visit,sizeof(visit),0);\n visit[a[i].id]:=a[i].p;\n for j:=i+1 to total do\n begin\n if a[j].b<a[i].b then write('x');\n if (visit[a[j].id]=0) then\n begin\n inc(count);\n visit[a[j].id]:=a[j].p;\n end;\n visit[a[j].id]:=min(visit[a[j].id],a[j].p);\n end;\n if count<n-1 then break;\n price:=0;\n for j:=1 to n do inc(price,visit[j]);\n if ans<(a[i].b\/price) then ans:=a[i].b\/price;\n end;\n writeln(ans:3:3);\n\n dec(t);\n end;\n{\n close(input);\n close(output); }\nend.\n<\/pre><\/p>\n","protected":false},"excerpt":{"rendered":"\u54ea\u4e3a\u670b\u53cb\u5e2e\u6211\u770b\u770b\u591a\u5173\u952e\u5b57\u6392\u5e8f\u54ea\u513f\u9519\u4e86\u2026\u2026 Program P1018; type product=record […]<\/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":[79],"class_list":["post-43","post","type-post","status-publish","format-standard","hentry","category-defaultcategory","tag-sequence"],"yoast_head":"\n
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