- Sum of kth powers of first n natural numbers
- Count pairs in an array that hold i+j= arr[i]+arr[j]
- Maximum length of balanced string after swapping and removal of characters
- Minimize sum of adjacent difference with removal of one element from array
- Group consecutive characters of same type in a string
- Check for an array element that is co-prime with all others
- Find foot of perpendicular from a point in 2 D plane to a Line
- Length of the longest substring that do not contain any palindrome
- Remove all occurrences of any element for maximum array sum
- Minimum cost to modify a string
- Number of sub-strings that contain the given character exactly k times
- Count of substrings which contains a given character K times

- Determinant of a Matrix
- Count number of substrings with exactly k distinct characters
- Count of character pairs at same distance as in English alphabets
- Check if frequency of all characters can become same by one removal
- Alternate vowel and consonant string
- Decimal representation of given binary string is divisible by 5 or not
- Minimum sum of squares of character counts in a given string after removing k characters
- Find uncommon characters of the two strings
- To check divisibility of any large number by 999
- Calculate the difficulty of a sentence
- Calculate maximum value using '+' or '*' sign between two numbers in a string
- Concatenated string with uncommon characters of two strings
- Number of substrings with count of each character as k
- Count of strings where adjacent characters are of difference one
- Count number of equal pairs in a string