Program test_2011_3;
var
sum:array[0..10, 0..10] of integer;
s,num:array[1.. 10] of integer;
a, b, c, d, n, m, ans, now, i, j: integer;
begin
readln(n, m);
for i:=1 to 10 do s[i]:=0;
for i:=0 to 10 do
for j:=0 to 10 do sum[i, j]:=0;
for a := 1 to n do
begin
for b := 1 to m do
begin
read(num[b]);
s[b]:=s[b] + num[b];
sum [a, b] := sum[a, b-1] + s[b];
end;
readln;
end;
ans:= -32766;
for a := 1 to n do
for b := 1 to m do
for c := a to n do
for d := b to m do
begin
now:=sum[c, d] - sum[a-1, d] - sum[c, b-1] + sum[a-1, b-1];
if ans<now then ans:= now;
end;
writeln(ans);
end.
(1)输入：
1 3
12 3 -4
输出：
(1)输入：
3 3
12 -10 21
-2 9 3
1 4 -6

输出：15|33