记录编号	21921	评测结果	AAATTTTTTT
题目名称	牛宫	最终得分	30
用户昵称	itachi	是否通过	未通过
代码语言	Pascal	运行时间	8.358 s
提交时间	2010-11-15 20:56:06	内存使用	1.04 MiB

program t2(input,output);
var
data,h,s:array[0..200,0..200]of int64;
i,j,n,m,x,y:integer;   t,max:int64;
 procedure ss(a1,a2,b1,b2:integer);

 var
 i,j:integer;k:int64;
 begin
   t :=0;    k:=(b1+1-a1)*(b2+1-a2);
  if k< max then exit;
    for i:= a2 to b2 do
    inc(t,s[i,b1]-s[i,a1-1]);
    if t>0 then  max:=  k;

 end;
begin
assign(input,'long.in');
reset(input);
assign(output,'long.out');
rewrite(output);
readln(n,m);
fillchar(data,sizeof(data),0);

fillchar(s,sizeof(s),0);
for i:= 1 to n do
 for j:= 1 to m do
  read(data[i,j]);
close(input);

 for i:= 1 to m do
 for j:= 1 to n do
  inc(s[i,j],s[i,j-1]+data[j,i]);
max:=0;
for i:= 1 to n do
for j:= 1 to m do
 for x:=n downto i do
 for y:= m downto  j do
  begin
  if (x<i) or (y<j) then continue;
  ss(i,j,x,y);
  end;
  writeln(max);
close(output);


end.