In this Set .add() problem we need to develop a python program that can read an integer and string input separated with each line. and then we need to print the unique number of countries that given to us on the output screen.


HackerRank Set .add() solution in python


Problem solution in Python 2 programming.

n = int(raw_input())
stamp = set()
for i in range(n):
  stamp.add(raw_input())
print len(stamp)


Problem solution in Python 3 programming.

# Enter your code here. Read input from STDIN. Print output to STDOUT
a = set()
[a.add(input()) for _ in range(int(input()))]
print(len(a))


Problem solution in pypy programming.

n = int(raw_input())
estampas = [raw_input() for i in range(n)]

print len(set(estampas))


Problem solution in pypy3 programming.

# Enter your code here. Read input from STDIN. Print output to STDOUT
num  = int(input())
country = set([])
for i in range(num):
    country.add(input())
print(len(list(country)))