uses crt;
const nmax=20;
type Tmatr=array[1..nmax,1..nmax] of integer;
var a:^Tmatr;
n,i,j:byte;
x:integer;
begin
clrscr;
repeat
write('Размер матрицы до ',nmax,' n=');
readln(n);
until n in [1..nmax];
new(a);
writeln('Исходная матрица:');
for i:=1 to n do
begin
for j:=1 to n do
begin
a^[i,j]:=10*i+j;
write(a^[i,j]:4);
end;
writeln;
end;
writeln;
for i:=1 to n div 2 do
for j:=1 to n do
begin
x:=a^[i,j];
a^[i,j]:=a^[n-i+1,j];
a^[n-i+1,j]:=x;
end;
writeln('Отражение по горизонтальной оси:');
for i:=1 to n do
begin
for j:=1 to n do
write(a^[i,j]:4);
writeln;
end;
dispose(a);
readln
end.