59 lines
953 B
Plaintext
59 lines
953 B
Plaintext
program TestPermutations;
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{$APPTYPE CONSOLE}
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type
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TItem = Integer; // declare ordinal type for array item
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TArray = array[0..3] of TItem;
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const
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Source: TArray = (1, 2, 3, 4);
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procedure Permutation(K: Integer; var A: TArray);
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var
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I, J: Integer;
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Tmp: TItem;
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begin
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for I:= Low(A) + 1 to High(A) + 1 do begin
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J:= K mod I;
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Tmp:= A[J];
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A[J]:= A[I - 1];
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A[I - 1]:= Tmp;
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K:= K div I;
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end;
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end;
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var
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A: TArray;
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I, K, Count: Integer;
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S, S1, S2: ShortString;
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begin
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Count:= 1;
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I:= Length(A);
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while I > 1 do begin
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Count:= Count * I;
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Dec(I);
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end;
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S:= '';
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for K:= 0 to Count - 1 do begin
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A:= Source;
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Permutation(K, A);
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S1:= '';
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for I:= Low(A) to High(A) do begin
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Str(A[I]:1, S2);
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S1:= S1 + S2;
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end;
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S:= S + ' ' + S1;
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if Length(S) > 40 then begin
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Writeln(S);
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S:= '';
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end;
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end;
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if Length(S) > 0 then Writeln(S);
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Readln;
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end.
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