program labI4;
Uses crt;
Label m1;
Var   a,a5: array [1..25,1..25] of real;
      b,b5: array [1..25] of real;
      k,i,m,n,st:integer;
      t,x,x1,x2,x3,a1,b1,c1:real;
BEGIN
 clrscr;
 write('Vvedite razmernost');
 readln(n);
 For i:=1 to n do
 For k:=1 to n do begin
  write('a[',i,',',k,']=');readln(a[i,k]);a5[i,k]:=a[i,k];
 end;
 writeln('Vvedite svobodnye chleny B');
 For i:=1 to n do begin
  write('b[',i,']=');readln(b[i]);b5[i]:=b[i];
 end;
 writeln('Nachalnaya matriza');
 For i:=1 to n do begin
  For k:=1 to n do begin
   write('a[',i,',',k,']=',a[i,k]:5:2,'':4);
  end;
  writeln('b[',i,']=',b[i]:5:2,'':4);
 end;
 readln;
 For k:=1 to n do begin
  st:=k;
  For i:=k to n do
   If a[st,k]<=a[i,k] Then st:=i;
  For i:=1 to n do begin
   t:=a[k,i];
   a[k,i]:=a[st,i];
   a[st,i]:=t;
  end;
  t:=b[k];
  b[k]:=b[st];
  b[st]:=t;
  For i:=1 to n do begin
   If i=k Then i:=i+1;
   If i=n+1 Then goto m1;
   t:=a[i,k]/a[k,k];
   For m:=1 to n do
    a[i,m]:=a[i,m]-t*a[k,m];
   b[i]:=b[i]-t*b[k];
  end;
  m1:
 end;
 writeln(' Konechnaya matriza');
 For i:=1 to n do begin
  For k:=1 to n do begin
   write('a[',i,k,']=',a[i,k]:5:2,'':4);
  end;
  writeln('b[',i,']=',b[i]:5:2,'':4);
 end;
 readln;
 For k:=1 to n do begin
  x:=b[k]/a[k,k];
  writeln('x(',k,')=',x:5:2);
  a[1,k]:=x;
 end;
 readkey
END.