Sequential Search Algorithm Assignment Help


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What is Sequential Search Algorithm?


Given: the list of the element is m, and the target value
1: index <-- 0
2: Repeating the 3rd step to 5th step
3: Comparing the list of target [ index ]
4: if 'target' = list[ index ] then return 'index' // success(got the value of index)
else if index >= (m - 1)
return -1 // not found the value of index
5: index <-- (index + 1)


Sequential search algorithm complexity:


1) From the ‘worst case’ --> n
2) From the ‘best case’ --> 1
3) From the ‘average case’:

Sequential search algorithm complexity average case

4) In cases like this, the complexity of search was in this obtain connected with ‘n’, denoted since O( n ).


Time complexity for sequential search


Sequential search Best_case
Sequential search Worst_Case
Sequential search Average_Case
Beast case is when the element being   searched is the first element
Worst case is when the element being   searched NOT in the list or it is the last element.
The   number of comparisons done is about (n + 1) / 2 in average case.
Example:
5, 4, 7, 3, 9, 1
search element: 5
Example
5, 4, 7, 3, 9, 1
search element: 1 or 6


Time complexity of sequential search is O( 1 )
Time complexity of sequential search is O( n )



Example1: Find sequential search. Target value is 30. Sequence is 50, 20, 70, 30, 80.

Solution:

Index
0
1
2
3
4
value
50
20
70
30
80


Step1: comparing the element of the value is 30 with index at index[ 0 ]
Step2: comparing the element of the value is 30 with index at index[ 1 ]
Step3: comparing the element of the value is 30 with index at index[ 2 ]
Step4: comparing the element of the value is 30 with index at index[ 3 ] … success (got the value of index)



Example2: Find sequential search. Target value is 55. Sequence is 50, 20, 70, 30, 80.

Solution:

Index
0
1
2
3
4
value
50
20
70
30
80


Step1: comparing the element of the value is 55 with index at index[ 0 ]
Step2: comparing the element of the value is 55 with index at index[ 1 ]
Step3: comparing the element of the value is 55 with index at index[ 2 ]
Step4: comparing the element of the value is 55 with index at index[ 3 ]
Step5: comparing the element of the value is 55 with index at index[ 4 ]… not found the value of index