HackerRank Set Mutations problem solution in Python

HackerRank Set Mutations problem solution in Python – In this Set mutations problem, You are given a set A and N number of other sets. These N number of sets have to perform some specific mutation operations on set A. Your task is to execute those operations and print the sum of elements from set A.

We have seen the applications of union, intersection, difference and symmetric difference operations, but these operations do not make any changes or mutations to the set.

We can use the following operations to create mutations to a set:

.update() or |=
Update the set by adding elements from an iterable/another set.

>>> H = set("Hacker")
>>> R = set("Rank")
>>> H.update(R)
>>> print H
set(['a', 'c', 'e', 'H', 'k', 'n', 'r', 'R'])

.intersection_update() or &=
Update the set by keeping only the elements found in it and an iterable/another set.

>>> H = set("Hacker")
>>> R = set("Rank")
>>> H.intersection_update(R)
>>> print H
set(['a', 'k'])

.difference_update() or -=
Update the set by removing elements found in an iterable/another set.

>>> H = set("Hacker")
>>> R = set("Rank")
>>> H.difference_update(R)
>>> print H
set(['c', 'e', 'H', 'r'])

.symmetric_difference_update() or ^=
Update the set by only keeping the elements found in either set, but not in both.

>>> H = set("Hacker")
>>> R = set("Rank")
>>> H.symmetric_difference_update(R)
>>> print H
set(['c', 'e', 'H', 'n', 'r', 'R'])

HackerRank Set Mutations problem solution in Python 2.

# Enter your code here. Read input from STDIN. Print output to STDOUT
raw_input()
s = set(map(int,raw_input().split()))
n = int(raw_input())
for _ in range(n):
    exec "s." + raw_input().split()[0] + "(map(int,set(raw_input().split())))"
print sum(s)

Set Mutations problem solution in Python 3.

# Enter your code here. Read input from STDIN. Print output to STDOUT

if __name__ == '__main__':
    (_, A) = (int(input()),set(map(int, input().split())))
    B = int(input())
    for _ in range(B):
        (command, newSet) = (input().split()[0],set(map(int, input().split())))
        getattr(A, command)(newSet)

    print (sum(A))

Problem solution in pypy programming.

# Enter your code here. Read input from STDIN. Print output to STDOUT
(_, A) = (
    raw_input(),
    set(map(int, raw_input().split()))
)

for _ in xrange(input()):
    (command, newSet) = (
        raw_input().split()[0],
        set(map(int, raw_input().split()))
    )

    getattr(A, command)(newSet)

print sum(A)

Problem solution in pypy3 programming.

# Enter your code here. Read input from STDIN. Print output to STDOUT
n = input()
s = set(map(int, input().split())) 

for _ in range(int(input())):
    args = input().strip().split()
    nw= set(map(int, input().split())) 
    eval("s." + args[0] + "(  nw  )")
print(sum(s))