?????(Sequential Search)

1
?????

• ???????
• ?????(Sequential Search)
• ?????(Binary Search)
• ?????(Interpolation Search)

2
?????????????

• ???
• ???????
• ???????

3
?????

• ??????,??????????????????????????????????????,????
  ???????????,??????????????????????????
  ??????????,?????
• 1.????????????,?????????????????
• 2.???????????,???????????,????????????????

4
?????

• ??????????,???????????????????????,???????(Static
  Search)?????(Dynamic Search)?
• ??????????????,????????????????????,??????????????
  ???
• ?????????????,?????????????????????

5
?????(Sequential Search)

• ??????????,????????????????????????????,??????????
  ??????,????????????,??????????????????????????????
  ??????,??????????

6
???????

• ??
• ?????????????,????????????,???????????,??n???,???
  ???O(n)?
• ??????,???????????,??(n1)/2????
• ???????,??????????????????????????????????????

7
?????(Binary Search)

• ?????????????,??????????????????????????,?????????
  ???,?????????,???????????????,?????????????

8
???????

• ????????????????????????,???????log2n1?log2(n
  1),??????O(log n)?
• ???????????,?????????????????
• ????????????????

9
???????????????

• ?????
• ???????????,???????? ?
• ?????????,??????,??????????????????
• ?????
• ?????????????,????????
• ????????????,?????????????,??????????????

10
?????(Interpolation Search)

• ?????????????,??????????????????????,?????????????
  ,???????????????????????????????,?????????????????
  ???????????????
• Midlow (( key - datalow ) / ( datahigh -
  datalow )) ( high - low )

11
????????

• key??????,datahigh?datalow?????????????????,??
  ????n,??????????
• 1.????????????1,2,3...n???
• 2.?low1,highn
• 3.?lowlthigh?,??????4???5
• 4.?Midlow (( key - datalow ) / ( datahigh
  -datalow )) ( high - low )
• 5.
• ?keyltkeyMid?high?Mid-1??highMid-1
• ?keykeyMid????????????
• ?keygtkeyMid?low?Mid1??lowMid1

12
???????

• 1.????,????????????,???????????,???????,??????????
  ???????????????????????,??????O(log n)?
• 2.????????????????