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# All posts in Algorithms

### Maximum Difference in an Array

Problem Statement You are given an array of integers and must compute the maximum difference between any item and any lower indexed smaller item for all the possible pairs, i.e., for a given array ‘a’, find the maximum value of a[j] – a[i] for all i, j where 0 ≤ . . . Read more

### Fun with Anagrams

Problem Statement Two strings are anagrams if they are permutations of each other. For example, “aaagmnrs” is an anagram of “anagrams”. Given an array of strings, remove each string that is an anagram of an earlier string, then return the remaining array in sorted order. For example, given the strings . . . Read more

### Special Palindrome Again Challenge

Problem Statement A string is said to be a special palindromic string if either of two conditions is met: * All of the characters are the same, e.g. aaa. * All characters except the middle one are the same, e.g. aadaa. A specialpalindromic substring is any substring of a string . . . Read more

### Making Anagrams Challenge

Problem Statement Alice is taking a cryptography class and finding anagrams to be very useful. We consider two strings to be anagrams of each other if the first string’s letters can be rearranged to form the second string. In other words, both strings must contain the same exact letters in . . . Read more

### Counting Inversions Challenge

Problem Statement In an array, , the elements at indices and (where ) form an inversion if . In other words, inverted elements and are considered to be “out of order”. To correct an inversion, we can swap adjacent elements. For example, consider the dataset . It has two inversions: . . . Read more

### Frequency Queries

Problem Statement You are given queries. Each query is of the form two integers described below: – : Insert x in your data structure. – : Delete one occurence of y from your data structure, if present. – : Check if any integer is present whose frequency is exactly . . . . Read more

### Count Triplets Challenge

You are given an array and you need to find number of tripets of indices such that the elements at those indices are in geometric progression for a given common ratio and . For example, . If , we have and at indices and . Function Description Complete the countTriplets . . . Read more

### Ransom Note Challenge

Problem Statement Harold is a kidnapper who wrote a ransom note, but now he is worried it will be traced back to him through his handwriting. He found a magazine and wants to know if he can cut out whole words from it and use them to create an untraceable . . . Read more

### Minimum Swaps Challenge

Problem Statement You are given an unordered array consisting of consecutive integers without any duplicates. You are allowed to swap any two elements. You need to find the minimum number of swaps required to sort the array in ascending order. For example, given the array we perform the following steps: . . . Read more

### Counting Valleys Challenge

Problem Statement Gary is an avid hiker. He tracks his hikes meticulously, paying close attention to small details like topography. During his last hike he took exactly steps. For every step he took, he noted if it was an uphill, , or a downhill, step. Gary’s hikes start and end . . . Read more