Program p1;
const
n = 4;
var
a: array [1 .. n, 1 .. n] of integer;
i, j: integer;
begin
for i := 1 to n do
for j := 1 to n do
a[i, j] := +1 + random(50);
for i := 1 to n do
for j := 1 to n do
if i = j then
a[i, j] := 0;
for i := 1 to n do
begin
writeln;
for j := 1 to n do
write(a[i, j]:3);
end;
readln;
readln;
end.