Найти номер строки матрицы с наибольшей суммой элементов

unit Unit1;
 
interface
 
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Grids, ExtCtrls, Spin;
 
type
  TForm1 = class(TForm)
    StringGrid1: TStringGrid;
    Button1: TButton;
    Button2: TButton;
    Label1: TLabel;
    Memo1: TMemo;
    SpinEdit1: TSpinEdit;
    procedure Button1Click(Sender: TObject);
      procedure Button2Click(Sender: TObject);
 private
    { Private declarations }
  public
    { Public declarations }
  end;
 
var
 Form1: TForm1;
  n:integer;
  a:array of array of integer;
 implementation
{$R *.dfm}
 
procedure TForm1.Button1Click(Sender: TObject);
var i,j:integer;
begin
randomize;
n:=SpinEdit1.Value;
setlength(a,n,n);
with StringGrid1 do
 begin
  ColCount:=n;
  RowCount:=n;
 
 end;
for i:=0 to n-1 do
for j:=0 to n-1 do
 begin
  a[i,j]:=random(25);
  StringGrid1.Cells[j,i]:=IntToStr(a[i,j]);
 end;
end;
 procedure TForm1.Button2Click(Sender: TObject);
var i,j,s:integer;
begin
for i:=0 to n-1 do
for j:=0 to n-1 do
a[i,j]:=strtoint(stringgrid1.Cells[i,j]);
for i:=0 to n-1 do
 begin
  s:=0;
  for j:=0 to n-1 do
  s:=s+a[i,j];
Memo1.Lines.Add('Сумма в строке '+inttostr(i+1)+'='+inttostr(s));
end;
 end;
end.