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Pengurutan cepat
  (quick sort)
   Pengurutan data merupakan komponen dasar
    struktur data
       Misal : Pencarian biner, Pencarian interpolasi
   Pengurutan data juga dimanfaatkan untuk
    mengeliminasi rekaman-rekaman yang ganda.
   Pengurutan rekaman terbagi menjadi beberapa
    bagian
         1.   Pengurutan gelembung
         2.   Pengurutan dengan penyisipan
         3.   Pengurutan dengan cepat
         4.   Pengurutan lomuto
         5.   Pengurutan dengan Heap (deret atau pohon biner)
 Memproses berkas dengan membagi rekaman-
  rekaman menjadi beberapa kelompok kemudian
  mengurutkannya.
 Bila sebuah kelompok hanya berisi satu item
  maka proses pengurutan kelompok tersebut
  dihentikan
 Bila proses pengurutan untuk semua kelompok
  sudah selesai, maka keseluruhan rekaman dalam
  berkas sudah dalam keadaan urut
   Prosedur quick sort melakukan pengurutan
    berkas dengan mengelompokkan rekaman-
    rekaman menjadi beberapa kelompok berdasar
    hasil perbandingan terhadap anggota berkas
    tertentu.

   Proses tersebut diulang sampai semua
    kelompok sudah dalam keadaan urut
Algoritma Quick Sort
1.   Jika terdapat sejumlah rekaman yang harus
     diurutkan, pisahkan rekaman-rekaman tersebut
     dalam tiga kelompok (rekaman-rekaman dengan
     kunci rekaman lebih kecil dari kunci rekaman
     pertama dan rekaman-rekaman dengan kunci
     rekaman lebih besar dari kunci rekaman
     pertama)
        Ulangi langkah 1 untuk rekaman-rekaman dalam kelompok
         pertama maupun kelompok ke-3
        Ulangi langkah 1 untuk rekaman-rekaman dalam subkelompok
         yang dibentuk oleh langkah (a)

2.   Jika masing-masing hanya terdapat 1 rekaman
     dalam semua kelompok atau subkelompok (sub-
     sub…) maka proses berakhir
   Berkas/kelompok dibagi berdasar pada perbandingan
    dengan rekaman pertama dari berkas/kelompok.

   Semua rekaman dengan kunci lebih kecil dari kunci
    pada rekaman pertama di letakkan di sebelah kiri
    rekaman pembanding

   Kemudian rekaman dengan kunci yang lebih besar di
    letakkan pada bagian sebelah kanan rekaman
    pembanding.
Latihan
Urutkanlah rekaman-rekaman berikut :
36 25 79 56 89 76 90 100

Urutkanlah rekaman-rekaman berikut :
9    8    26 12 19 63 52 99

Urutkanlah rekaman-rekaman berikut :
85 51 61 41 73 43 101 93

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File sistem06

  • 1. Pengurutan cepat (quick sort)
  • 2. Pengurutan data merupakan komponen dasar struktur data Misal : Pencarian biner, Pencarian interpolasi  Pengurutan data juga dimanfaatkan untuk mengeliminasi rekaman-rekaman yang ganda.  Pengurutan rekaman terbagi menjadi beberapa bagian 1. Pengurutan gelembung 2. Pengurutan dengan penyisipan 3. Pengurutan dengan cepat 4. Pengurutan lomuto 5. Pengurutan dengan Heap (deret atau pohon biner)
  • 3.  Memproses berkas dengan membagi rekaman- rekaman menjadi beberapa kelompok kemudian mengurutkannya.  Bila sebuah kelompok hanya berisi satu item maka proses pengurutan kelompok tersebut dihentikan  Bila proses pengurutan untuk semua kelompok sudah selesai, maka keseluruhan rekaman dalam berkas sudah dalam keadaan urut
  • 4. Prosedur quick sort melakukan pengurutan berkas dengan mengelompokkan rekaman- rekaman menjadi beberapa kelompok berdasar hasil perbandingan terhadap anggota berkas tertentu.  Proses tersebut diulang sampai semua kelompok sudah dalam keadaan urut
  • 5. Algoritma Quick Sort 1. Jika terdapat sejumlah rekaman yang harus diurutkan, pisahkan rekaman-rekaman tersebut dalam tiga kelompok (rekaman-rekaman dengan kunci rekaman lebih kecil dari kunci rekaman pertama dan rekaman-rekaman dengan kunci rekaman lebih besar dari kunci rekaman pertama)  Ulangi langkah 1 untuk rekaman-rekaman dalam kelompok pertama maupun kelompok ke-3  Ulangi langkah 1 untuk rekaman-rekaman dalam subkelompok yang dibentuk oleh langkah (a) 2. Jika masing-masing hanya terdapat 1 rekaman dalam semua kelompok atau subkelompok (sub- sub…) maka proses berakhir
  • 6. Berkas/kelompok dibagi berdasar pada perbandingan dengan rekaman pertama dari berkas/kelompok.  Semua rekaman dengan kunci lebih kecil dari kunci pada rekaman pertama di letakkan di sebelah kiri rekaman pembanding  Kemudian rekaman dengan kunci yang lebih besar di letakkan pada bagian sebelah kanan rekaman pembanding.
  • 7.
  • 8.
  • 9. Latihan Urutkanlah rekaman-rekaman berikut : 36 25 79 56 89 76 90 100 Urutkanlah rekaman-rekaman berikut : 9 8 26 12 19 63 52 99 Urutkanlah rekaman-rekaman berikut : 85 51 61 41 73 43 101 93