Symmetric Difference in Python HackerRank Solution

Hello coders, In this post, you will learn how to solve Symmetric Difference in Python HackerRank Solution. This problem is a part of the Python Hacker Rank series.

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Symmetric Difference in Python - HackerRank Solution
Symmetric Difference in Python – HackerRank Solution

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Symmetric Difference in Python HackerRank Solution

problem

Objective
Today, we’re learning about a new data type: sets.

Concept
If the inputs are given on one line separated by a space character, use split() to get the separate values in the form of a list:

>> a = raw_input()
5 4 3 2
>> lis = a.split()
>> print (lis)
['5', '4', '3', '2']

If the list values are all integer types, use the map() method to convert all the strings to integers.

>> newlis = list(map(int, lis))
>> print (newlis)
[5, 4, 3, 2]

Sets are an unordered bag of unique values. A single set contains values of any immutable data type.

CREATING SETS

>> myset = {1, 2} # Directly assigning values to a set
>> myset = set()  # Initializing a set
>> myset = set(['a', 'b']) # Creating a set from a list
>> myset
{'a', 'b'}

MODIFYING SETS
Using the add() function:

>> myset.add('c')
>> myset
{'a', 'c', 'b'}
>> myset.add('a') # As 'a' already exists in the set, nothing happens
>> myset.add((5, 4))
>> myset
{'a', 'c', 'b', (5, 4)}

Using the update() function:

>> myset.update([1, 2, 3, 4]) # update() only works for iterable objects
>> myset
{'a', 1, 'c', 'b', 4, 2, (5, 4), 3}
>> myset.update({1, 7, 8})
>> myset
{'a', 1, 'c', 'b', 4, 7, 8, 2, (5, 4), 3}
>> myset.update({1, 6}, [5, 13])
>> myset
{'a', 1, 'c', 'b', 4, 5, 6, 7, 8, 2, (5, 4), 13, 3}

REMOVING ITEMS
Both the discard() and remove() functions take a single value as an argument and removes that value from the set. If that value is not present, discard() does nothing, but remove() will raise a KeyError exception.

>> myset.discard(10)
>> myset
{'a', 1, 'c', 'b', 4, 5, 7, 8, 2, 12, (5, 4), 13, 11, 3}
>> myset.remove(13)
>> myset
{'a', 1, 'c', 'b', 4, 5, 7, 8, 2, 12, (5, 4), 11, 3}

COMMON SET OPERATIONS
Using union(), intersection() and difference() functions.

>> a = {2, 4, 5, 9}
>> b = {2, 4, 11, 12}
>> a.union(b) # Values which exist in a or b
{2, 4, 5, 9, 11, 12}
>> a.intersection(b) # Values which exist in a and b
{2, 4}
>> a.difference(b) # Values which exist in a but not in b
{9, 5}

The union() and intersection() functions are symmetric methods:

>> a.union(b) == b.union(a)
True
>> a.intersection(b) == b.intersection(a)
True
>> a.difference(b) == b.difference(a)
False

These other built-in data structures in Python are also useful.

Task :

Given 2 sets of integers, M and N, print their symmetric difference in ascending order. The term symmetric difference indicates those values that exist in either M or N but do not exist in both.


Input Format :

The first line of input contains an integer, M.
The second line contains M space-separated integers.
The third line contains an integer, N.
The fourth line contains N space-separated integers.

Output Format :

Output the symmetric difference integers in ascending order, one per line.


Sample Input :

4
2 4 5 9
4
2 4 11 12

Sample Output :

5
9
11
12

Symmetric Difference in Python HackerRank Solution

# Enter your code here. Read input from STDIN. Print output to STDOUT
# Symmetric Difference in Python - Hacker Rank Solution START
M = int(input())
mset = set(map(int, input().split()))
N = int(input())
nset = set(map(int, input().split()))
mdef = mset.difference(nset)
ndef = nset.difference(mset)
output = mdef.union(ndef)
for i in sorted(list(output)):
    print(i)
# Symmetric Difference in Python - Hacker Rank Solution END

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