Set .difference() Operation in python - HackerRank Solution
Problem :
 |
| Set .difference() Operation in python - HackerRank Solution |
.difference()
The tool .difference() returns a set with all the elements
from the set that are not in an iterable.Sometimes the - operator is used in place of the .difference() tool, but it only operates on the set of elements in set.
Set is immutable to the .difference() operation (or the - operation).
>>> s = set("Hacker") >>> print s.difference("Rank") set(['c', 'r', 'e', 'H']) >>> print s.difference(set(['R', 'a', 'n', 'k'])) set(['c', 'r', 'e', 'H']) >>> print s.difference(['R', 'a', 'n', 'k']) set(['c', 'r', 'e', 'H']) >>> print s.difference(enumerate(['R', 'a', 'n', 'k'])) set(['a', 'c', 'r', 'e', 'H', 'k']) >>> print s.difference({"Rank":1}) set(['a', 'c', 'e', 'H', 'k', 'r']) >>> s - set("Rank") set(['H', 'c', 'r', 'e'])
Task :
You are given two sets of student roll numbers. One set has subscribed to the
English newspaper, and one set has subscribed to the French newspaper. Your
task is to find the total number of students who have subscribed to only
English newspapers.
Input Format :
The first line contains the number of students who have subscribed to the English newspaper.The second line contains the space separated list of student roll numbers who have subscribed to the English newspaper.
The third line contains the number of students who have subscribed to the French newspaper.
The fourth line contains the space separated list of student roll numbers who
have subscribed to the French newspaper.
Constraints :
- 0 < Total number of student in college < 1000
Output Format :
Output the total number of students who are subscribed to the English
newspaper only.
Sample Input :
9 1 2 3 4 5 6 7 8 9 9 10 1 2 3 11 21 55 6 8
Sample Output :
4
Explanation :
4, 5, 7 and 9.
Hence, the total is 4 students.
Solution :
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | # Set .difference() Operation in python - Hacker Rank Solution # python3 # Enter your code here. Read input from STDIN. Print output to STDOUT # Set .difference() Operation in python - Hacker Rank Solution START N1 = int(input()) storage1 = set(input().split()) N2 = int(input()) storage2 = set(input().split()) storage3 = storage1.difference(storage2) print(len(storage3)) # Set .difference() Operation in python - Hacker Rank Solution END |
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