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Topic: String-question / Level: Advanced






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 Implement a function to find the k most frequent words in a string. Write a function to count the number of distinct palindromic subsequences in a string. Implement a function to count the number of substrings where each character occurs at least twice. Write a function to find the smallest number of adjacent swaps to make two strings anagrams of each other. Implement a function to find the longest palindrome that can be made from a string by swapping at most two characters. Implement a function to determine the lexicographical rank of a string among its permutations. Implement a function to check if two strings are one edit distance apart. Implement a function to determine if a string is a valid IP address. Write a function to find the longest substring that can be rearranged into a palindrome by deleting exactly one character. Write a function to check if two strings can be made identical by reversing any two non-overlapping substrings. Write a function to check if one string is a rotation of another string. Write a function to remove all adjacent pairs of duplicate characters from a string until no such pairs exist. Write a function to check if a string can be segmented into words from a dictionary. Write a function to check if two strings can be made identical by swapping any two characters. Write a function to find the smallest number of operations to transform a string into a valid anagram of another string using only cyclic shifts.