Math Number Theory Combinatorics Learner Implement the integerSquareRootFloor method that returns the floor value of the square root of an integer. Solved
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
Loop Array Hash Map Counting Prefix Sum Intermediate Implement the nextPermutationRankChange method that returns the next lexicographical permutation of the array. Solved
Loop Array Hash Map Counting Prefix Sum Learner Implement the maximumConsecutiveOnes method that returns the longest run of consecutive 1 values. Solved
Loop Array Hash Map Counting Prefix Sum Intermediate Implement the mergeOverlappingIntervalsCount method that returns how many intervals remain after merging all overlaps. Solved
Loop Array Hash Map Counting Prefix Sum Learner Implement the missingNumberZeroToN method that finds the missing number from the range 0 to n. Solved
Loop Array Hash Map Counting Prefix Sum Learner Implement the findDuplicateNumber method that returns a duplicate value from the array. Solved
Loop Array Hash Map Counting Prefix Sum Intermediate Implement the rotateArrayRightK method that returns the array after rotating it k positions to the right. Solved
Loop Array Hash Map Counting Prefix Sum Intermediate Implement the productArrayExceptSelf method that returns an array where each value is the product of all other values. Solved
Loop Array Hash Map Counting Prefix Sum Learner Implement the majorityElementValue method that returns the value that appears more than half of the time. Solved