itertools.combinations() in Python HackerRank Solution

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

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itertools.combinations() in Python HackerRank Solution

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itertools.combinations() in Python HackerRank Solution

problem

itertools.combinations(iterable, r)
This tool returns the r length subsequences of elements from the input iterable.
Combinations are emitted in lexicographic sorted order. So, if the input iterable is sorted, the combination tuples will be produced in sorted order.

Sample Code :

>>> from itertools import combinations
>>>
>>> print list(combinations('12345',2))
[('1', '2'), ('1', '3'), ('1', '4'), ('1', '5'), ('2', '3'), ('2', '4'), ('2', '5'), ('3', '4'), ('3', '5'), ('4', '5')]
>>>
>>> A = [1,1,3,3,3]
>>> print list(combinations(A,4))
[(1, 1, 3, 3), (1, 1, 3, 3), (1, 1, 3, 3), (1, 3, 3, 3), (1, 3, 3, 3)]

Task :

You are given a string S.
Your task is to print all possible combinations, up to size k, of the string in lexicographic sorted order.


Input Format :

A single line containing the string S and integer value k separated by a space.

Constraints :

  • 0 < k <= len(S)

The string contains only UPPERCASE characters.

Output Format :

Print the different combinations of string S on separate lines.


Sample Input :

HACK 2

Sample Output :

A
C
H
K
AC
AH
AK
CH
CK
HK

itertools.combinations() in Python HackerRank Solution

# itertools.combinations() in Python - Hacker Rank Solution
# Python 3
# Enter your code here. Read input from STDIN. Print output to STDOUT
# itertools.combinations() in Python - Hacker Rank Solution START
from itertools import combinations
io = input().split()
S = io[0]
k = int(io[1])
for i in range(1,k+1):
    for j in combinations(sorted(S),i):
        print("".join(j))

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