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Hackerrank -itertools.permutations() Solution

Hackerrank -itertools.permutations() Solution

Beeze Aal
Beeze Aal

itertools.permutations(iterable[, r])

This tool returns successive Ā length permutations of elements in an iterable.

If Ā is not specified or is None, then Ā defaults to the length of the iterable, and all possible full length permutations are generated.

Permutations are printed in a lexicographic sorted order. So, if the input iterable is sorted, the permutation tuples will be produced in a sorted order.

Sample Code

>>> from itertools import permutations
>>> print permutations(['1','2','3'])
<itertools.permutations object at 0x02A45210>
>>> 
>>> print list(permutations(['1','2','3']))
[('1', '2', '3'), ('1', '3', '2'), ('2', '1', '3'), ('2', '3', '1'), ('3', '1', '2'), ('3', '2', '1')]
>>> 
>>> print list(permutations(['1','2','3'],2))
[('1', '2'), ('1', '3'), ('2', '1'), ('2', '3'), ('3', '1'), ('3', '2')]
>>>
>>> print list(permutations('abc',3))
[('a', 'b', 'c'), ('a', 'c', 'b'), ('b', 'a', 'c'), ('b', 'c', 'a'), ('c', 'a', 'b'), ('c', 'b', 'a')]

Task

You are given a string .
Your task is to print all possible permutations of size Ā of the string in lexicographic sorted order.

Input Format

A single line containing the space separated string Ā and the integer value .

Constraints


The string contains only UPPERCASE characters.

Output Format

Print the permutations of the string Ā on separate lines.

Sample Input

HACK 2

Sample Output

AC
AH
AK
CA
CH
CK
HA
HC
HK
KA
KC
KH

Explanation

All possible size Ā permutations of the string "HACK" are printed in lexicographic sorted order.

Solution in Python

from itertools import permutations
string, length = input().split()
output = ["".join(i) for i in permutations(string,int(length))]
output.sort()
print("\n".join(output))