HackerRank Python Tutorial

Python Set.add() HackerRank Solution

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If we want to add a single element to an existing set, we can use the .add() operation.
It adds the element to the set and returns 'None'.

Example

>>> s = set('HackerRank')
>>> s.add('H')
>>> print s
set(['a', 'c', 'e', 'H', 'k', 'n', 'r', 'R'])
>>> print s.add('HackerRank')
None
>>> print s
set(['a', 'c', 'e', 'HackerRank', 'H', 'k', 'n', 'r', 'R'])

Task

Apply your knowledge of the .add() operation to help your friend Rupal.

Rupal has a huge collection of country stamps. She decided to count the total number of distinct country stamps in her collection. She asked for your help. You pick the stamps one by one from a stack of N country stamps.

Find the total number of distinct country stamps.

Input Format

The first line contains an integer N, the total number of country stamps.
The next N lines contains the name of the country where the stamp is from.

Constraints

0 < N < 1000

Output Format

Output the total number of distinct country stamps on a single line.

Sample Input

7
UK
China
USA
France
New Zealand
UK
France

Sample Output

Explanation

UK and France repeat twice. Hence, the total number of distinct country stamps is 5 (five).

Solution:

n = int(input())
Country = set()
for i in range(n):
    Country.add(input())
print(len(Country))

Steps used in solving the problem -

Step 1: First we have taken the input of n.
Step 2: then we created an empty set to store country names.
Step 3: then we created a for loop in the range of n.
Step 4: Inside for loop, we used add method to add inputs to our set.
Step 5: In the last step, we printed the length of our set.

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HackerRank Python Tutorial

HackerRank Python Tutorial

Hacker rank python solutions

Python Set.add() HackerRank Solution

Task

Input Format

Constraints

Output Format

Sample Input

Sample Output

Explanation

Solution:

Steps used in solving the problem -

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