String Manipulation String Hash Map Counting Character Pattern Matching Learner Implement the romanNumeralToInteger method that converts a Roman numeral string into an integer. Solved
String Manipulation String Hash Map Counting Character Pattern Matching Learner Implement the checkStringRotation method that checks whether one string is a rotation of another string. Solved
String Manipulation String Hash Map Counting Character Pattern Matching Learner Implement the firstUniqueCharacterIndex method that returns the index of the first character that appears only once. Solved
String Manipulation String Hash Map Counting Character Pattern Matching Proficient Implement the minimumWindowContainsPatternLength method that returns the length of the smallest substring containing all pattern characters. Solved
String Manipulation String Hash Map Counting Character Pattern Matching Intermediate Implement the stringCompressionLength method that returns the length after compressing consecutive repeated characters. Solved
String Manipulation String Hash Map Counting Character Pattern Matching Learner Implement the validPalindromeAlphanumeric method that checks whether a text is a palindrome after ignoring non-alphanumeric characters. Solved
String Manipulation String Hash Map Counting Character Pattern Matching Intermediate Implement the longestPalindromicSubstringLength method that returns the length of the longest palindromic substring. Solved
String Manipulation String Hash Map Counting Character Pattern Matching Intermediate Implement the groupAnagramCount method that counts how many anagram groups are formed from the words. Solved
String Manipulation String Hash Map Counting Character Pattern Matching Learner Implement the validAnagramCheck method that checks whether two strings are anagrams. Solved
String Manipulation String Hash Map Counting Character Pattern Matching Intermediate Implement the longestSubstringNoRepeat method that returns the length of the longest substring without repeated characters. Solved
String Manipulation String Counting Character Learner Implement the removeDuplicateCharacters method that returns the text after keeping only the first occurrence of each character. Solved
String Manipulation String Counting Character Intermediate Implement the areTextsAnagram method that checks whether two texts contain the same characters with the same frequencies. Solved
String Manipulation String Counting Character Intermediate Implement the firstNonRepeatingCharacter method that returns the first character in the text that appears only once. Solved
String Hash Map Character Intermediate Implement the method firstNonRepeatingChar that returns the first non-repeating character in a string. Solved