Intersection Study - Algorithm(Sort)
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Transcript of Intersection Study - Algorithm(Sort)
ALGORITHM
ALGORITHMSORT
Selection Sort Quick Sort
ALGORITHM
SORT INTRO
What is Sort?
ALGORITHM
SORT INTRO
Make data in Sequence
4 3 8 6 7 13 10 14 9
3 4 6 7 8 9 10 13 14
ALGORITHM
SORT INTRO
Make data in Sequence
Key(comparing data)
Sort Order(Ascending, Descending)
Sort Efficiency
(time complexity)
SortStability(keep sort order)
ALGORITHM
SORT Selection Sort
Selection Sort
ALGORITHM
SORT Selection Sort
select best-fit-data every time
s s d d .. d d d d
sorted unsorted
select data fits this position
ALGORITHM
SORT Selection Sort
4 3 8 6 7 13 10 14 9
Selection Sort in Ascend order
Min Data
unsorted
ALGORITHM
SORT Selection Sort
3 4 8 6 7 13 10 14 9
Selection Sort in Ascend order
unsorted
swap
sorted
ALGORITHM
SORT Selection Sort
3 4 8 6 7 13 10 14 9
Selection Sort in Ascend order
unsortedsorted
Min Data
ALGORITHM
SORT Selection Sort
3 4 8 6 7 13 10 14 9
Selection Sort in Ascend order
unsortedsorted
ALGORITHM
SORT Selection Sort
3 4 8 6 7 13 10 14 9
Selection Sort in Ascend order
unsortedsorted
Min Data
ALGORITHM
SORT Selection Sort
3 4 6 8 7 13 10 14 9
Selection Sort in Ascend order
unsortedsorted
swap
ALGORITHM
SORT Selection Sort
3 4 6 8 7 13 10 14 9
Selection Sort in Ascend order
unsortedsorted
Min Data
ALGORITHM
SORT Selection Sort
3 4 6 7 8 13 10 14 9
Selection Sort in Ascend order
unsortedsorted
swap
ALGORITHM
SORT Selection Sort
3 4 6 7 8 13 10 14 9
Selection Sort in Ascend order
unsortedsorted
Min Data
ALGORITHM
SORT Selection Sort
3 4 6 7 8 13 10 14 9
Selection Sort in Ascend order
unsortedsorted
ALGORITHM
SORT Selection Sort
3 4 6 7 8 13 10 14 9
Selection Sort in Ascend order
unsortedsorted
Min Data
ALGORITHM
SORT Selection Sort
3 4 6 7 8 9 10 14 13
Selection Sort in Ascend order
unsortedsorted
swap
ALGORITHM
SORT Selection Sort
3 4 6 7 8 9 10 14 13
Selection Sort in Ascend order
unsortedsorted
Min Data
ALGORITHM
SORT Selection Sort
3 4 6 7 8 9 10 14 13
Selection Sort in Ascend order
unsortedsorted
ALGORITHM
SORT Selection Sort
3 4 6 7 8 9 10 14 13
Selection Sort in Ascend order
unsortedsorted
Min Data
ALGORITHM
SORT Selection Sort
3 4 6 7 8 9 10 13 14
Selection Sort in Ascend order
unsortedsorted
swap
ALGORITHM
SORT Selection Sort
3 4 6 7 8 9 10 13 14
Selection Sort in Ascend order
sorted
ALGORITHM
SORT Quick Sort
Quick Sort
divide dataset with pivot
s … p ... d d d d d
less than p bigger than p
pivot
ALGORITHM
SORT Quick Sort
select pivot
ALGORITHM
SORT Quick Sort
4 3 8 6 7 13 2 14 9
pivot
left right
Move left to first data bigger than pivot
ALGORITHM
SORT Quick Sort
4 3 8 6 7 13 2 14 9
pivot
left right
Move right to first data less than pivot
ALGORITHM
SORT Quick Sort
4 3 8 6 7 13 2 14 9
pivot
left right
swap left and right
ALGORITHM
SORT Quick Sort
4 3 2 6 7 13 8 14 9
pivot
left right
Move left to first data bigger than pivot
ALGORITHM
SORT Quick Sort
4 3 2 6 7 13 8 14 9
pivot
left right
Move right to first data less than pivot
ALGORITHM
SORT Quick Sort
4 3 2 6 7 13 8 14 9
pivot
left
right
swap right with pivot
ALGORITHM
SORT Quick Sort
2 3 4 6 7 13 8 14 9
pivot
swap right with pivot
ALGORITHM
SORT Quick Sort
2 3 4 6 7 13 8 14 9
pivot
less than 4 bigger than 4
sorting problem divided into two problems
ALGORITHM
SORT Quick Sort
2 3 4 6 7 13 8 14 9
less than 4 bigger than 4
sort left partition
ALGORITHM
SORT Quick Sort
2 3
pivot
left
right
Move left to first data bigger than pivot
ALGORITHM
SORT Quick Sort
2 3
pivot
left
right
Move right to first data less than pivot
ALGORITHM
SORT Quick Sort
2 3
pivot
left
right
sorted
ALGORITHM
SORT Quick Sort
2 3
try right part
ALGORITHM
SORT Quick Sort
2 3 4 6 7 13 8 14 9
sorted bigger than 4
sort right partition
ALGORITHM
SORT Quick Sort
6 7 13 8 14 9
pivot
left
right
ALGORITHM
SORT Quick Sort
6 7 13 8 14 9
pivot
left
right
Move left to first data bigger than pivot
ALGORITHM
SORT Quick Sort
6 7 13 8 14 9
pivot
left
right
Move right to first data less than pivot
ALGORITHM
SORT Quick Sort
sorting problem divided into two problems but left is none
6 7 13 8 14 9…
bigger than 6
ALGORITHM
SORT Quick Sort
sort right partition
7 13 8 14 9
pivot
left
right
ALGORITHM
SORT Quick Sort
7 13 8 14 9
pivot
left
right
Move left to first data bigger than pivot
ALGORITHM
SORT Quick Sort
7 13 8 14 9
pivot
left
right
Move right to first data less than pivot
ALGORITHM
SORT Quick Sort
7 13 8 14 9…
bigger than 7
sorting problem divided into two problems but left is none
ALGORITHM
SORT Quick Sort
13 8 14 9
sort right partition
pivot
left
right
ALGORITHM
SORT Quick Sort
13 8 14 9
pivot
left
right
Move left to first data bigger than pivot
ALGORITHM
SORT Quick Sort
13 8 14 9
pivot
left
Move right to first data less than pivot
right
ALGORITHM
SORT Quick Sort
13 8 9 14
pivot
left
right
swap left and right
ALGORITHM
SORT Quick Sort
9 8 13 14
pivot
swap pivot and right
right
ALGORITHM
SORT Quick Sort
9 8 13 14
less than 13 bigger than 13
sorting problem divided into two problems
ALGORITHM
SORT Quick Sort
9 8 13 14
less than 13 sorted
no need to sort one element
ALGORITHM
SORT Quick Sort
9 8
sort left partition
pivot
left
right
ALGORITHM
SORT Quick Sort
9 8
pivot
left
right
Move left to first data bigger than pivot
ALGORITHM
SORT Quick Sort
9 8
pivot
left
right
Move right to first data less than pivot
ALGORITHM
SORT Quick Sort
8
Swap left and right
9
pivot
ALGORITHM
SORT Quick Sort
8
sorted
9
ALGORITHM
SORT Quick Sort
8
sorted
9
ALGORITHM
SORT Quick Sort
8 9 13 14
less than 13 sorted
sorted
ALGORITHM
SORT Quick Sort
sorted
7 8 9 13 14
bigger than 7
ALGORITHM
SORT Quick Sort
sorted
6 7 8 9 13 14
bigger than 6
sorted
ALGORITHM
SORT Quick Sort
2 3 4 6 7 8 9 13 14
sorted bigger than 4
sort complete
ALGORITHM
SORT Quick Sort
2 3 4 6 7 8 9 13 14
sorted
