Merge the Tools! Hackerrank Solution Python

Merge the Tools! Hackerrank Solution Python
Merge the Tools! Hackerrank Solution Python

Merge the Tools! Hackerrank Solution Python

Consider the following:

  • A string, s, of length n where s=c0c1…cn-1.
  • An integer, k, where k is a factor of n.

We can split s into n/k substrings where each subtring, t1, consists of a contiguous block of k characters in s. Then, use each ti to create string ui such that:

  • The characters in  are a subsequence of the characters in ti.
  • Any repeat occurrence of a character is removed from the string such that each character in ui occurs exactly once. In other words, if the character at some index j in ti occurs at a previous index <j in ti, then do not include the character in string ui.

Given s and k, print n/k lines where each line i denotes string ui.



There are three substrings of length 3 to consider: ‘AAA’, ‘BCA’ and ‘DDE’. The first substring is all ‘A’ characters, so ui=’A’. The second substring has all distinct characters, so u2=”BCA”. The third substring has 2 different characters, so u3=’DE’. Note that a subsequence maintains the original order of characters encountered. The order of characters in each subsequence shown is important.

Function Description

Complete the merge_the_tools function in the editor below.

merge_the_tools has the following parameters:

  • string s: the string to analyze
  • int k: the size of substrings to analyze


Print each subsequence on a new line. There will be n/k of them. No return value is expected.

Input Format

The first line contains a single string, s.
The second line contains an integer,k , the length of each substring.


  • 1<=n<=10^4, where  is the length of s
  • 1<=k<=n
  • It is guaranteed that n is a multiple of k.

Sample Input

STDIN       Function
-----       --------
3           k = 3

Sample Output



Split  into n/k=9/3=3 equal parts of length k=3. Convert each ti to ui by removing any subsequent occurrences of non-distinct characters in ti:

  1. t0=”AAB”->u0=”AB”
  2. t1=”CCA”->u1=”CA”
  3. t2=”ADA”->u3=”AD”

Print each ui on a new line.


#Merge the Tools! Hackerrank Solution Python

from collections import OrderedDict 
def merge_the_tools(string, k):
    # your code goes here
    for i in range(0,len(string),k):
def removeDup(str): 
    return "".join(OrderedDict.fromkeys(str))

f __name__ == '__main__':
    string, k = raw_input(), int(raw_input())
    merge_the_tools(string, k)

#Merge the Tools! Hackerrank Solution Python

Disclaimer: This problem is originally created and published by HackerRank, we only provide solutions to this problem. Hence, doesn’t guarantee the truthfulness of the problem. This is only for information purposes.

Leave a Comment