Often, when a list is sorted, the elements being sorted are just keys to other values. For example, if you are sorting files by their size, the sizes need to …
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Comparison Sorting Quicksort usually has a running time of n*log(n), but is there an algorithm that can sort even faster? In general, this is not possible. Most sorting algorithms are …
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In this challenge, you will determine whether a string is funny or not. To determine whether a string is funny, create a copy of the string in reverse e.g.abc->cba . …
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A weighted string is a string of lowercase English letters where each letter has a weight. Character weights are 1 to 26 from a to z as shown below: The …
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A pangram is a string that contains every letter of the alphabet. Given a sentence determine whether it is a pangram in the English alphabet. Ignore case. Return either pangram …
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The previous challenges covered Insertion Sort, which is a simple and intuitive sorting algorithm with a running time of O(n^2). In these next few challenges, we’re covering a divide-and-conquer algorithm …
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We say that a string contains the word hackerrank if a subsequence of its characters spell the word hackerrank. Remember that a subsequence maintains the order of characters selected from …
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In a previous challenge you implemented the Insertion Sort algorithm. It is a simple sorting algorithm that works well with small or mostly sorted data. However, it takes a long …
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A space explorer’s ship crashed on Mars! They send a series of SOS messages to Earth for help. Letters in some of the SOS messages are altered by cosmic radiation …
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Julius Caesar protected his confidential information by encrypting it using a cipher. Caesar’s cipher shifts each letter by a number of letters. If the shift takes you past the end …
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