HackerRank Python Solution - Strings - Merge the Tools!

Consider the following:

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

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

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

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

HackerRank Python Solution - Strings - The Minion Game

• Kevin and Stuart want to play 'The Minion Game'.

Game Rules:

• Both players are given the same string, S.
• Both players have to make substrings using the letters of the string S.
• Stuart has to make words starting with consonants.
• Kevin has to make words starting with vowels.
• The game ends when both players have made all possible substrings.

Scoring:

• A player gets a +1 point for each occurrence of the substring in the string S.

HackerRank Python Solution - Strings - Alphabet Rangoli

• You are given an integer, N. Your task is to print an alphabet rangoli of size N. (Rangoli is a form of Indian folk art based on the creation of patterns.)
• Different sizes of alphabet rangoli are shown below:

#size 3

----c----
--c-b-c--
c-b-a-b-c
--c-b-c--
----c----

HackerRank Python Solution - Strings - String Formatting

Given an integer, n, print the following values for each integer i from 1 to n:

• Decimal
• Octal
• Hexadecimal (capitalized)
• Binary

Function Description:

• Complete the print_formatted function in the editor below.
• print_formatted has the following parameters:
• int number: the maximum value to print

HackerRank Python Solution - Strings - Capitalize!

• You are asked to ensure that the first and last names of people begin with a capital letter in their passports. For example, alison heck should be capitalized correctly as Alison Heck.

• Given a full name, your task is to capitalize the name appropriately.

HackerRank Python Solution - Strings - Text Wrap

• You are given a string S and width w.
• Your task is to wrap the string into a paragraph of width w.

Function Description:

• Complete the wrap function in the editor below.
• the wrap has the following parameters:
• string: a long string
• int max_width: the width to wrap to
• Returns string: a single string with newline characters ('\n') where the breaks should be

HackerRank Python Solution - Strings - Text Alignment

• In Python, a string of text can be aligned left, right and center.

.ljust(width):

• This method returns a left-aligned string of length width.

>>> width = 20
>>> print 'HackerRank'.ljust(width,'-')
HackerRank----------

HackerRank Python Solution - Strings - String Validators

• Python has built-in string validation methods for basic data. It can check if a string is composed of alphabetical characters, alphanumeric characters, digits, etc.

str.isalnum():

• This method checks if all the characters of a string are alphanumeric (a-z, A-Z and 0-9).

>>> print 'ab123'.isalnum()
True
>>> print 'ab123#'.isalnum()
False

HackerRank Python Solution - Strings - Find a String

• In this challenge, the user enters a string and a substring. You have to print the number of times that the substring occurs in the given string. String traversal will take place from left to right, not from right to left.
• NOTE: String letters are case-sensitive.

Input Format:

• The first line of input contains the original string. The next line contains the substring.

HackerRank Python Solution - Strings - Mutations

• We have seen that lists are mutable (they can be changed), and tuples are immutable (they cannot be changed).
• Let's try to understand this with an example.
• You are given an immutable string, and you want to make changes to it.

Example:

>>> string = "abracadabra"

HackerRank Python Solution - Strings - What's Your Name?

You are given the firstname and lastname of a person on two different lines. Your task is to read them and print the following:

 

Hello firstname lastname! You just delved into python.

Function Description:

• Complete the print_full_name function in the editor below.
• print_full_name has the following parameters:
• string first: the first name
• string last: the last name
• Prints string: 'Hello firstname lastname! You just delved into python' where and are replaced with first and last.