Frequency-counting - Basic Articles
Sum of all even occurring element in an array
Given an array of integers containing duplicate elements. The task is to find the sum of all even occurring elements in the given array. That… Read More
cpp-unordered_map
frequency-counting
Arrays
DSA
Hash
Find the sum of all highest occurring elements in an Array
Given an array of integers containing duplicate elements. The task is to find the sum of all highest occurring elements in the given array. That… Read More
cpp-unordered_map
frequency-counting
Arrays
DSA
Hash
Sum of all minimum occurring elements in an Array
Given an array of integers containing duplicate elements. The task is to find the sum of all least occurring elements in the given array. That… Read More
cpp-unordered_map
frequency-counting
Arrays
DSA
Hash
Printing frequency of each character just after its consecutive occurrences
Given a string in such a way that every character occurs in a repeated manner. Your task is to print the string by inserting the… Read More
frequency-counting
DSA
Sorting
Sum of all elements repeating ‘k’ times in an array
Given an array, we have to find the sum of all the elements repeating k times in an array. We need to consider every repeating… Read More
frequency-counting
Arrays
DSA
Hash
Check if max occurring character of one string appears same no. of times in other
Given two strings, we need to take the character which has the maximum occurrence in the first string, and then we have to check if… Read More
frequency-counting
DSA
Strings
Find frequency of each word in a string in Python
Write a python code to find the frequency of each word in a given string. Examples: Input : str[] = "Apple Mango Orange Mango Guava… Read More
frequency-counting
DSA
Python
Strings
Print the arranged positions of characters to make palindrome
You are given a string s (only lowercase alphabet) with length n. Print the position of every character of the string it must acquire so… Read More
cpp-vector
frequency-counting
palindrome
DSA
Misc
Strings
Minimum changes to a string to make all substrings distinct
Given a string, find minimum number of changes to it so that all substrings of the string become distinct. Examples :  Input : str =… Read More
frequency-counting
DSA
Strings
Least frequent element in an array
Given an array, find the least frequent element in it. If there are multiple elements that appear least number of times, print any one of… Read More
frequency-counting
Arrays
DSA
Misc
Searching
Sorting
Check if two strings have a common substring
You are given two strings str1 and str2. You have to check if the two strings share a common substring. Examples :  Input : str1… Read More
cpp-vector
frequency-counting
DSA
Strings
Longest subsequence where each character occurs at least k times
Given a string ‘s’ and an integer k, find other string ‘t’ such that ‘t’ is the largest subsequence of given string ‘s’ and each… Read More
frequency-counting
subsequence
DSA
Strings
Check if both halves of the string have at least one different character
Earlier we have discussed on how to check if both halves of the string have same set of characters. Now, we further extend our problem… Read More
frequency-counting
DSA
Sorting
Strings
Count number of equal pairs in a string
Given a string s, find the number of pairs of characters that are same. Pairs (s[i], s[j]), (s[j], s[i]), (s[i], s[i]), (s[j], s[j]) should be… Read More
frequency-counting
Combinatorial
DSA
Strings
Longest Common Anagram Subsequence
Given two strings str1 and str2 of length n1 and n2 respectively. The problem is to find the length of the longest subsequence which is… Read More
anagram
frequency-counting
subsequence
DSA
Strings
Check whether a given string is Heterogram or not
Given a string S. The task is to check whether a the given string is Heterogram or not. A heterogram is a word, phrase, or… Read More
frequency-counting
DSA
Strings
Anagram checking in Python using collections.Counter()
Write a function to check whether two given strings are anagram of each other or not. An anagram of a string is another string that… Read More
anagram
frequency-counting
DSA
Python
Strings
Program to sort string in descending order
Given a string, sort it in descending order. Examples:  Input : alkasingh Output : snlkihgaa Input : nupursingh Output : uusrpnnihg Input : geeksforgeeks Output… Read More
frequency-counting
DSA
Hash
Misc
Sorting
Strings
Count frequencies of all elements in array in Python using collections module
Given an unsorted array of n integers which can contains n integers. Count frequency of all elements that are present in array. Examples: Input :… Read More
frequency-counting
Arrays
DSA
Python
Remove duplicates from a given string
Given a string S which may contain lowercase and uppercase characters. The task is to remove all duplicate characters from the string and find the… Read More
frequency-counting
DSA
Strings
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