const mn = 16; var p: Boolean; procedure Swap(var a, b: Integer); var T: Integer; begin T := a; a := b; b := T end; procedure CreateMagic(n: Integer); var i, j, k, s, b, r, m: Integer; a: Array[1.. mn, 1.. mn] Of Integer; begin p := True; if Odd(n) Then begin i := 1; j := Succ(n div 2); for k := 1 To Sqr(n) do begin a[i, j] := k; if k mod n = 0 Then Inc(i) Else begin Dec(i); Inc(j); if i = 0 Then i := n; if j > n Then j := 1 end end; end Else if n mod 4 = 0 Then begin k := 1; for i := 1 To n Do for j := 1 To n Do begin a[i, j] := k; Inc(k) end; j := 2; m := n div 2; for i := 1 To m Do for k := 1 To m Div 2 Do begin if j = Succ(m) Then j := 2 Else if j = (m + 2) Then j := 1; s := Succ(n - i); b := Succ(n - j); Swap(a[i, j], a[s, b]); Swap(a[i, b], a[s, j]); Inc(j, 2) end end Else if n <> 2 Then begin k := 1; for i := 1 To n Do for j := 1 To n Do begin a[i, j] := k; Inc(k) end; r := Pred(n div 2) div 2; m := n div 2; for i := 1 To m Do begin j := i; for k := 1 To r Do begin if j > m Then j := 1; s := Succ(n - i); b := Succ(n - j); Swap(a[i, j], a[s, b]); Swap(a[i, b], a[s, j]); Inc(j) end end; i := 1; for k := 1 To m Do begin if j > m Then j := 1; s := Succ(n - i); Swap(a[i, j], a[s, j]); Inc(i); Inc(j) end; i := 1; j := r + 2; for k := 1 To m Do begin if j > m Then j := 1; b := Succ(n - j); Swap(a[i, j], a[i, b]); Inc(i); Inc(j) end end Else p := False; if p Then begin for i := 1 To n Do begin for j := 1 To n Do Write(a[i, j]: 4); WriteLn end end Else WriteLn( 'do not exists' ) end; var n: Integer; begin WriteLn('n = '); ReadLn(n); CreateMagic(n); end.
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Объяснение:
Түсндңба