ANTICHAT — форум по информационной безопасности, OSINT и технологиям

{$APPTYPE CONSOLE}

type
  TMatrix =
    record
      size: integer;
      data: array of array of integer;
    end;

var
  m: TMatrix;

function Minor(matrix: TMatrix; i,j: integer): TMatrix;
var
  a,b,a1,b1: integer;
begin
  a1 := -1;
  b1 := -1;
  result.size := matrix.size - 1;
  setlength(result.data, result.size, result.size);
  for a := 0 to result.size do
    begin
      if a=i then
        continue
      else
        inc(a1);
      for b := 0 to result.size do
        begin
          if b = j then
            continue
          else
            if b - b1 > 1 then
              inc(b1)
            else
              b1 := 0;
          result.data[a1,b1] := matrix.data[a,b];
      end;
    end;
end;

function Determ(matrix: TMatrix): integer;
var
  i: integer;
begin
  result := 0;
  if matrix.size = 2 then
    result := (matrix.data[0,0]*matrix.data[1,1]) - (matrix.data[0,1]*matrix.data[1,0])
  else
    begin
      for i := 0 to matrix.size - 1 do
        if odd(i+1) then
          result := result + matrix.data[i,0]*Determ(Minor(matrix,i,0))
        else
          result := result - matrix.data[i,0]*Determ(Minor(matrix,i,0));
    end;
end;

begin
  m.size := 3;
  setlength(m.data,3,3);
  m.data[0,0] := 2;
  m.data[0,1] := 4;
  m.data[0,2] := -1;
  m.data[1,0] := -1;
  m.data[1,1] := 3;
  m.data[1,2] := 2;
  m.data[2,0] := 3;
  m.data[2,1] := 2;
  m.data[2,2] := -2;
  writeln(Determ(m));
  readln;
end.