const
n=4;
var
a:array [1..n,1..n] of integer;
i,j,max:integer;
begin
writeln('Matrix:');
for i:=1 to n do
begin
for j:=1 to n do
begin
a[i,j]:=random(8)-4;
write(a[i,j]:2,' ')
end;
writeln
end;
max:=1;
for i:=2 to n do
if a[i,i]>a[max,max] then
max:=i;
j:=a[max,max];
a[max,max]:=a[1,1];
a[1,1]:=j;
writeln('Result:');
for i:=1 to n do
begin
for j:=1 to n do
write(a[i,j]:2,' ');
writeln
end;
end.