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# itertools.combinations() Hacker Rank Solution – Queslers

## Problem: itertools.combinations() Hacker Rank Solution

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)]
``````

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() Hacker Rank Solution in python 2

``````from itertools import combinations

S,k = raw_input().split()
k = int(k)

for r in xrange(1,k+1):
print '\n'.join(sorted(''.join(sorted(c)) for c in combinations(S,r)))``````

### itertools.combinations() Hacker Rank Solution in python 3

``````# Enter your code here. Read input from STDIN. Print output to STDOUT
from itertools import combinations

s , n  = input().split()

for i in range(1, int(n)+1):
for j in combinations(sorted(s), i):
print(''.join(j))
``````

#### itertools.combinations() Hacker Rank Solution in pypy

``````# Enter your code here. Read input from STDIN. Print output to STDOUT
from itertools import combinations
string_number = raw_input().split()
string = string_number
number = map(int, string_number)

def Print(given_list):
for elem in given_list:
n = len(elem)
elem_print = ""
for i in range(0, n):
elem_print+=elem[i]
print elem_print
return

for i in range(1, number+1):
Print(list(combinations(sorted(string), i)))
# print list(combinations(string, number))``````

### itertools.combinations() Hacker Rank Solution in pypy 3

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

import itertools

ll, m = input().split()

k = int(m)

for n in range(k):
for i in itertools.combinations(sorted(ll), n+1):
print("".join(i))``````
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