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LeetCode Solution - Problem Reverse Integer

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Given a signed 32-bit integer x, return x with its digits reversed. If reversing x causes the value to go outside the signed 32-bit integer ...

LeetCode Solution - Problem Single Number

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Given a non-empty array of integers nums, every element appears twice except for one. Find that single one. You must implement a solution wi...

LeetCode Solution - Problem Fizz Buzz

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Given an integer n, return a string array answer (1-indexed) where: answer[i] == "FizzBuzz" if i is divisible by 3 and 5. answer[i...

HackerRank Python Solution - Regex and Parsing - Validating Roman Numerals

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You are given a string, and you have to validate whether it's a valid Roman numeral. If it is valid, print True. Otherwise, print False....

HackerRank Python Solution - Regex and Parsing - Group(), Groups() & Groupdict()

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group(): A group() expression returns one or more subgroups of the match. >>> import re >>> m = re.match(r'(\w+)@(\w+)...

HackerRank Python Solution - Regex and Parsing - Re.start() & Re.end()

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start() & end(): These expressions return the indices of the start and end of the substring matched by the group. >>> import re...

HackerRank Python Solution - Regex and Parsing - Re.findall() & Re.finditer()

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re.findall(): The expression re.findall() returns all the non-overlapping matches of patterns in a string as a list of strings. >>>...

CodeChef - Python Practice Solution - Mahasena

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Problem: Kattapa, as you all know was one of the greatest warriors of his time. The kingdom of Maahishmati had never lost a battle under him...

HackerRank SQL Solution - Advanced Select - The PADS

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Generate the following two result sets: Query an alphabetically ordered list of all names in OCCUPATIONS, immediately followed by the first ...

HackerRank SQL Solution - Advanced Select - Type of Triangle

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Write a query identifying the type of each record in the TRIANGLES table using its three side lengths. Output one of the following statement...

HackerRank SQL Solution - Basic Select - Employee Salaries

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Write a query that prints a list of employee names (i.e.: the name attribute) for employees in Employees having a salary greater than $2000 ...