CASTLE - Xây dựng lâu đài
Tác giả: flashmt
Ngôn ngữ: Pascal
const fi='';
maxn=5010;
type ar=array[1..maxn] of longint;
var n,nx,ny:longint;
smax,smin,re,cmax,cmin,oo:qword;
a,b,e,d,x,y:ar;
f,g,h:array[1..maxn,1..maxn] of integer;
procedure rf;
var i:longint;
begin
read(n);
for i:=1 to n do
begin
read(a[i],b[i]);
x[i]:=a[i]; y[i]:=b[i];
d[i]:=i; e[i]:=i;
end;
end;
procedure sort(var x,d:ar;l,r:longint);
var i,j,t,u,v:longint;
begin
i:=l; j:=r; t:=x[(i+j) shr 1]; u:=d[(i+j) shr 1];
repeat
while (x[i]<t) or ((x[i]=t) and (d[i]<u)) do i:=i+1;
while (x[j]>t) or ((x[j]=t) and (d[j]>u)) do j:=j-1;
if i<=j then
begin
v:=x[i]; x[i]:=x[j]; x[j]:=v;
v:=d[i]; d[i]:=d[j]; d[j]:=v;
i:=i+1; j:=j-1;
end;
until i>j;
if i<r then sort(x,d,i,r);
if l<j then sort(x,d,l,j);
end;
procedure edit(var x,d,a:ar;var nx:longint);
var i:longint;
begin
nx:=1; a[d[1]]:=1;
for i:=2 to n do
begin
if x[i]>x[nx] then
begin
inc(nx);
x[nx]:=x[i];
end;
a[d[i]]:=nx;
end;
end;
procedure pr;
var i,j,last:longint; s,ss:qword;
begin
oo:=2000000000;
oo:=oo*oo*4;
last:=1; smin:=oo;
for i:=2 to n do
if a[i]=a[last] then
begin
for j:=last to i-1 do
begin
if f[b[j],b[i]]>0 then
begin
re:=re+f[b[j],b[i]];
s:=y[b[i]]-y[b[j]];
ss:=s*(x[a[i]]-x[h[b[j],b[i]]]);
s:=s*(x[a[i]]-x[g[b[j],b[i]]]);
if s=smax then inc(cmax);
if s>smax then
begin
smax:=s; cmax:=1;
end;
if ss=smin then inc(cmin);
if ss<smin then
begin
smin:=ss; cmin:=1;
end;
end
else g[b[j],b[i]]:=a[i];
inc(f[b[j],b[i]]);
h[b[j],b[i]]:=a[i];
end;
end
else last:=i;
writeln(re);
if re>0 then
begin
writeln(smax,' ',cmax);
writeln(smin,' ',cmin);
end;
end;
begin
assign(input,fi); reset(input);
rf;
sort(x,d,1,n);
edit(x,d,a,nx);
sort(y,e,1,n);
edit(y,e,b,ny);
sort(a,b,1,n);
pr;
close(input);
end.