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CBSE Class 12 Computer Science Question 65 of 68

Data Structures - I : Linear Lists — Question 2

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Question 2

Implement the following function for a linear list, which find outs and returns the number of unique elements in the list

def unique(lst):
"""passed parameter lst is a list of 
integers (could be empty)."""

After implementing the above function, test it with following lists and show the output produced by above function along with the reason for that output.

(i) lst = []

(ii) lst = [1, 2, 3]

(iii) lst = [1, 2, 2]

(iv) lst = [1, 2, 2, 3, 3]

Answer 
def unique(lst):
    c = 0
    for i in range(0, len(lst)):
        if lst[i] not in lst[i+1:]:
            c += 1   
    return c

lst = eval(input("Enter the list: "))
print(unique(lst))
Output
Enter the list: []
0
Enter the list: [1, 2, 3]
3
Enter the list: [1, 2, 2]
2
Enter the list: [1, 2, 2, 3, 3]
3

(i) lst = [] — The output is 0 because the list is empty.

(ii) lst = [1, 2, 3] — The output is 3 because the list contains 3 unique elements — 1, 2, 3.

(iii) lst = [1, 2, 2] — The output is 2 because the list contains 2 unique elements — 1, 2.

(iv) lst = [1, 2, 2, 3, 3] — The output is 3 because the list contains 3 unique elements — 1, 2, 3.