从文件工作中删除重复的行，但不显示正确的索引

Question

以下代码可以很好地删除正确的重复行，但是当我在删除 StringList 行之前显示 I 时正确显示索引 (I) 只有第一次出现重复，之后，索引显示错误而不对应正确（总是比真实索引小）。如何解决？

这是代码：

program Project1;

{$APPTYPE CONSOLE}

{$R *.res}

uses
  System.Classes,
  System.SysUtils;

var
  slSrc, slDup: TStringList;
  I, J: Integer;

begin
  try
    slDup := TStringList.Create;
    try
      slSrc := TStringList.Create;
      try
        slSrc.LoadFromFile('C:\src.txt');

        for I := 0 to Pred(slSrc.Count) do
        begin
          for J := Pred(slSrc.Count) downto I + 1 do
          begin
            if SameStr(slSrc[I], slSrc[J]) then
            begin
              // Ex; If 1º dup index is = 3, is showed 3. OK
              // If 2º dup index is = 15, is showed always a minor like 13 for example
              // and continue displaying wrong index for next dups

              Writeln(IntToStr(I) + ' : ' + slSrc[I]);
              slDup.Add(slSrc[I]);
              slSrc.Delete(I);
            end;
          end;
        end;
        slSrc.SaveToFile('C:\src.txt');
        slDup.SaveToFile('C:\dup.txt');
      finally
        slSrc.Free;
      end;
    finally
      slDup.Free;
    end;
  except
    on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);
  end;
  Readln;
end.

Answer 1

如果删除具有较高索引的重复项不违反您的规则，只需使外部循环向下。在这种情况下，删除会保留其余部分。

 for I := Pred(slSrc.Count) downto 0 do
    begin
      for J := 0 to I - 1 do
 ...
         slSrc.Delete(I);

从文件工作中删除重复的行，但不显示正确的索引

Remove duplicated lines from file working, but not displaying correct index

delphi

duplicates

delphi-10.3-rio

tstringlist