Dense List

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9. ????????????????????????

• Dense List
• Linked List
• Applications

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?????????????????

• ??????????
• ??????????????????????? (Data Structure)
  ??????????
• ???????????????????? (Algorithm)
  ??????????????????
• Program Data Structure Algorithm

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Data Structure

• Linear
• Array
• Link List
• Stack
• Queue

• Non-Linear
• Tree
• Graph

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List

• ??????????????????????????????????????????????????
  ??????????????????????????????????????????????????
  ??????????????????

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List

• ?????????????????????????? 2 ????
• Array
• Link List

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count
1
3
4
25 31 42 58
4

25
31
42
58
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????????????????? Array

• ?????????????????????

Ex. newdata d
void insert (datatype newdata) position
search(newdata) ptr cur while (ptr gt
position) listptr1 listptr
ptr-- listposition newdata cur

a
b
position
d
e
e
g
t
cur
g
t
cur
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????????????????? Array

• ??????????????????

Ex. olddata e
void delete(datatype olddata) position
search(olddata) ptr position while
(ptr lt cur) listptr listptr1
ptr cur --
a
b
position
g
e
g
cur
t
t
cur
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????????????????? Array

1. ????????? Array ??????????????????????????????????
   ???????????????????? ???? ????????????????????????
   ???? 10,000 ??? ??????????????????? 2 byte
   ?????????????????????????????? 20,000 byte
   ??????????????????????????????????????????????????
   ???????????????????? 20,000 byte
   ?????????????????????????????
2. ????????????????????????????????????? 10,000 ???
   ?????????????????????????????????????????
   ?????????????????? ??????????????? 2,000 ???
   ?????????????????????????????????
   ?????????????????????????????

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????????????????? Array (???)

1. ?????????????????????????????????? 10,000 ???
   ?????????????????????????????????????????? 10,000
   ??? ????????????????????????????????????
   ????????????????????? ???????????????

Address
100 data1
102 data2
104 data3
106 data4

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????????? Linked list

• ???????????????????????????????????????
  ????????????????????????????????
  ?????????????????? ????????????????????????
• ???????????????????????????????????????????????

Address
100 data5
102
104 data1
106

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Linked List

• ??????????????????????????????????????????????????
  ????????????????????????????? 2 ???????
  ????????????????? (Data) ??? ?????????????????
  (Pointer)

1 ????
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Linked List

• ????????????????? (Data) ???????????????????? 1
  ?????? ??????????????
• ????????????????? (pointer) ?????????????????
  (Address) ????????????????????????
• ???????????????????
• Singly Linked List
• Doubly Linked List

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Linked List

• Singly Linked List ???????????????????????????????
  ?????????????????? ????????????????????
• ???????????????????????? ?????????????????????????
  ????? NULL ????????????????

data pointer
data pointer
data pointer
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Linked List

• Doubly Linked List ????????????????? Data ???
  ?????????????????? 2 ?????? ??? ?????????????????
  ??????????????????????? ??????????????????????????
  ??????????? 2 ???? ??? ?????????????????
  ????????????????????

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Linked List

• Operation ??? Linked list
• ??????????? (Insert) ?? list ?? 2 ???
• ??????????????? list (Append)
• ??????????????????? node
• ?? (Delete) ???????????? list

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Singly Linked List

• ??????????????
• head ???? address ????????????? list
• last ???? address ????????????????? list
• newnode ???? address ??????????????????????
• data ??????????
• next ???? address ????????????
• ?????????? list ?????? ????
• newnode -gt data ???????????????????????????
  newnode
• newnode -gt next ?????????????? address
  ????????????? newnode

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Singly Linked List

• ????????????????

struct node int data
struct node next
newnode
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Singly Linked List

• ????????????????????? list (Append)
• ????????
• 1. ???????????? Insert 25

1.1 create newnode 1.2 newnode -gt data
25 1.3 newnode -gt next NULL 1.4 head
newnode last (?)
25
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Singly Linked List

• ????????????????????? list (Append)
• ????????
• 2. ???????????? 2 Insert 30

2.1 create newnode 2.2 newnode -gt data
30 2.3 newnode -gt next NULL 2.4 last- gt
next newnode 2.5 last newnode (?)
30
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Singly Linked List

• ????????????????????? list (Append)
• ????????
• 2. ???????????? 2 Insert 30

2.1 create newnode 2.2 newnode -gt data
30 2.3 newnode -gt next NULL 2.4 last- gt
next newnode 2.5 last newnode
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Singly Linked List

• ????????????????????? list (Append)
• ????????
• 3. ???????????? 3 Insert 42

3.1 create newnode 3.2 newnode -gt data
42 3.3 newnode -gt next NULL 3.4 last- gt
next newnode 3.5 last newnode ( ?)
30
42
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Singly Linked List

• ????????????????????? list (Append)
• ????????
• 3. ???????????? 3 Insert 12

2.1 create newnode 2.2 newnode -gt data
12 2.3 newnode -gt next NULL 2.4 last- gt
next newnode 2.5 last newnode ( ?)
30
12
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Singly Linked List

• ???????????????????????????????? (Insert)
• ????????
• 4. Insert 38 ?????????????? 2 ?????????? 3

4.1 create newnode 4.2 newnode -gt data 38
38
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Singly Linked List

• ???????????????????????????????? (Insert)
• ????????
• 4. Insert 38 ?????????????? 2 ?????????? 3 (???)

4.3 ??? ptr ???? address ?????????? 2 4.4
newnode -gt next ptr -gt next 4.5 ptr -gt next
newnode
38
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Singly Linked List

• ????????????? list (Delete)
• ???????? Delete 25 ?????? list

• ??????? head -gt data 25 ??????? ?
• 2. ?????? ??? head head -gt next ( ?)

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Singly Linked List

• ????????????? list (Delete)
• ???????? Delete 38 ?????? list

• ??? ptr head
• ptr -gt next -gt data 38?
• ?????? ??? ptr -gt next ptr -gt next -gt next
• ????????? ??? ptr ptr -gt next ????????????? 2.
  ????

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Doubly Linked List

• ??????????????
• head ???? address ????????????? list
• last ???? address ????????????????? list
• newnode ???? address ??????????????????????
• data ??????????
• previous ???? address ???????????????
• next ???? address ????????????

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Doubly Linked List

• ?????????? list ?????? ????
• newnode -gt data ???????????????????????????
  newnode
• newnode -gt previous ?????????????? address
  ??????????????? newnode
• newnode -gt next ?????????????? address
  ????????????? newnode

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Doubly Linked List

• ????????????????

struct node int data
struct node next, previous
newnode
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Doubly Linked List

• ????????????????????? list (Append)
• ????????
• 1. ???????????? Insert 25

1.1 create newnode 1.2 newnode -gt data
25 1.3 newnode -gt previous NULL 1.4 newnode
-gt next NULL 1.5 head newnode last ( 100)
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Doubly Linked List

• ????????????????????? list (Append)
• ????????
• 2. ???????????? 2 Insert 30

2.1 create newnode 2.2 newnode -gt data
30 2.3 newnode -gt next NULL 2.4 newnode -gt
previous last 2.5 last- gt next
newnode 2.6 last newnode (200)
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Doubly Linked List

• ????????????????????? list (Append)
• ????????
• 3. ???????????? 3 Insert 42

25
3.1 create newnode 3.2 newnode -gt data
42 3.3 newnode -gt next NULL 3.4 newnode -gt
previous last 3.5 last- gt next
newnode 3.6 last newnode (300)
30
42
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Doubly Linked List

• ???????????????????????????????? (Insert)
• ????????
• 4. Insert 38 ?????????????? 2 ?????????? 3

4.1 create newnode 4.2 newnode -gt data 38
38
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Doubly Linked List

• ???????????????????????????????? (Insert)
• ???????? 4. Insert 38 ?????????????? 2
  ?????????? 3 (???)

4.3 ??? ptr ???? address ?????????? 2 4.4
newnode -gt next ptr-gt next 4.5 newnode -gt
previous ptr-gt next -gt previous 4.6 ptr -gt
next newnode
38
42
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Doubly Linked List

• ????????????? list (Delete)
• ???????? Delete 25 ?????? list

• ??????? head -gt data 25 ??????? ?
• 2. ?????? ??? head head -gt next ( ?)

42
38
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Singly Linked List

• ????????????? list (Delete)
• ???????? Delete 38 ?????? list

• ??? ptr head
• ptr -gt next -gt data 38?
• ?????? ??? ptr -gt next ptr -gt next -gt next
• ????????? ??? ptr ptr -gt pointer ?????????????
  2. ????

42
38
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Array vs Linked List

• Array
• ???????????
• ??????????????????

• Linked List
• ??????????????
• ???????????????

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Motto Today ??????????????????????????
?????????????????????? ?????????????????????????
Practice makes Perfect !