Matrix,colums with all equal elements, Pascal

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program MatrixColumns;

type
matrica=array[1..50,1..50] of integer;
var
a:matrica;
n,m:integer;
ind:boolean;

procedure makematrix(var a:matrica;var n:integer; var m:integer;var ind:boolean);
var
i,j:integer;
begin
ind:=false;
writeln('Input dimensions of matrix');
read(n,m);
if (n>0) and (m>0) then begin
ind:=true;
writeln('Input elements of matrix:');
for i:=1 to n do 
for j:=1 to m do
repeat
read(a[i][j]);
until (a[i][j]>=0) and (a[i][j]<=255)
end
end;

procedure wcolumn(a:matrica;i,m:integer);
var
j:integer;
begin
for j:=1 to m do write(a[i][j],' ');
writeln();
end;

procedure processing(a:matrica;n,m:integer);
var
ind:boolean;
i,j:integer;
begin
writeln('Appropriate colums are:');
for i:=1 to n do begin
ind:=true;
j:=2;
while (j<=m) and (ind) do
if (a[i][1]=a[i][j]) then j:=j+1
else ind:=false;
if(ind) then wcolumn(a,i,m)
end
end;

procedure writematrix(a:matrica;n,m:integer);
var
i,j:integer;
begin
writeln('Your matrix is: ');
for i:=1 to n do begin
for j:=1 to m do write(a[i][j],' ');
writeln()
end
end;

begin
makematrix(a,n,m,ind);
while(ind) do begin
writematrix(a,n,m);
processing(a,n,m);
makematrix(a,n,m,ind)
end
end.

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Compilation time: 0.24 sec, absolute running time: 0.19 sec, cpu time: 0.09 sec, memory peak: 3 Mb, absolute service time: 0,54 sec