记录编号	15236	评测结果	WWWWWWAAWWWWWWWWWWWW
题目名称	溶液混合	最终得分	10
用户昵称	bing	是否通过	未通过
代码语言	Pascal	运行时间	0.128 s
提交时间	2009-11-11 08:09:28	内存使用	0.15 MiB

program bing;
var
 f1,f2:text;
 a,b,max,min:array[1..50] of integer;
 n,m:integer;
 f:array[1..50,0..100] of real;
procedure init;
var
 i,j:integer;
begin
 assign(f1,'mix.in');reset(f1);
 assign(f2,'mix.out');rewrite(f2);
 readln(f1,n);
 for i:=1 to n do read(f1,a[i]);
 for i:=1 to n do read(f1,b[i]);
 read(f1,m);
 for i:=1 to 50 do
  for j:=0 to 100 do f[i,j]:=0;
 for i:=1 to 50 do
 begin
  max[i]:=0;min[i]:=101;
 end;
 f[1,a[1]]:=b[1];
 max[1]:=a[1];
 min[1]:=a[1];
end;
procedure nb;
var
 i,j,k,t1,t2:integer;
 v1,v2,b1,b2:real;
begin
 for i:=2 to n do
 begin
  if min[i-1]<a[i] then min[i]:=min[i-1] else min[i]:=a[i];
  if max[i-1]>a[i] then max[i]:=max[i-1] else max[i]:=a[i];
 for j:=min[i-1] to max[i-1] do
 begin
  if j<a[i] then
   begin
   v1:=f[i-1,j];v2:=b[i];
   t1:=j;t2:=a[i];
   end
  else
   begin
   v1:=b[i];v2:=f[i-1,j];
   t1:=a[i];t2:=j;
   end;
  for k:=t1 to t2 do
   begin
    b1:=abs(t2-k);
    b2:=abs(t1-k);
    if (b1=0)and(b2=0) then break;
    if b1=0 then f[i,k]:=f[i-1,k]+v2;
    if b2=0 then f[i,k]:=f[i-1,k]+v1;
    if (b1<>0)and(b2<>0) then
    begin
     if v1/b2*b1>v2 then f[i,k]:=f[i-1,k]+v2+v2/b1*b2
     else f[i,k]:=f[i-1,k]+v1+v1/b2*b1;
    end;
   end;
 end;
 end;
end;
begin
 init;
 nb;
 writeln(f2,f[n,m]:0:5);
 close(f1);close(f2);
end.