Hackerrank itertools-permutations | solution

 On this problems its little bit tricky which used both for loop unpacking stuff and  itertools knowledge use available problem alred stated that  permutation module were generate  variation of provided data types  in our case its string  so in returns we get its char variation we also have to pass width  as int which generate different variation and real twist was it gives use machine code so  that's why we using list to  store it but for string it  give tuples as variations of each with comma separated  so  we have list of tuples  now we wanted return or print this each tuples every element or char into  single line where is our unpacking things works  . in this we  have one advantage that  all items are string data types so we can usin joint for it

Problem:https://www.hackerrank.com/challenges/itertools-permutations/problem?isFullScreen=true

Code:

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

from itertools import permutations

S,k = input().split()

permitem = list(permutations(S,int(k)))

for item in sorted(permitem): print("".join(item))

Explanation:

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1. from itertools import permutations

   • We use this to import the permutations function, which is necessary to generate all possible permutations of a sequence. Without it, we wouldn’t have an easy way to generate the permutations.

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2. S, k = input().split()

   • This splits the user input into two parts: the sequence S and the number k (the length of each permutation). This separation allows us to work with the specific sequence and permutation length as two distinct variables, which is needed to generate the desired permutations.

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3. permitem = list(permutations(S, int(k)))

   • This generates all possible permutations of the sequence S with the length k, and stores them as a list. The conversion of k to an integer ensures we’re working with a number when specifying the permutation length. The list conversion makes it easier to sort and manipulate the permutations later.

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4. for item in sorted(permitem):

   • This sorts the list of permutations in lexicographical (alphabetical) order. Sorting is important because it ensures the output is in the correct order, which is typically expected for tasks like this where the permutations should be displayed in a particular sequence.

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5. print("".join(item))

   • This joins the characters in each permutation tuple into a single string and prints it. Permutations are returned as tuples, and we need to print them as strings, so join() is used to combine the characters of each tuple into a single string for proper output.

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