The selection sort improves on the bubble sort by making only one exchange for every pass through the list. In order to do this, a selection sort looks for the largest value as it makes a pass and, after completing the pass, places it in the proper location.
As with a bubble sort, after the first pass, the largest item is in the correct place. After the second pass, the next largest is in place. This process continues and requires n−1 passes to sort n items, since the final item must be in place after the (n−1) st pass.
Resources for Review
Check out the resources below for a review of Selection sort!
def selection_sort(arr):
# For every slot in array
for fillslot in range(len(arr)-1,0,-1):
positionOfMax=0
# For every set of 0 to fillslot+1
for location in range(1,fillslot+1):
# Set maximum's location
if arr[location]>arr[positionOfMax]:
positionOfMax = location
temp = arr[fillslot]
arr[fillslot] = arr[positionOfMax]
arr[positionOfMax] = temp
arr = [3,5,2,7,6,8,12,40,21] selection_sort(arr) arr
[2, 3, 5, 6, 7, 8, 12, 21, 40]
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