PracticeHash Tables25 problems — 13 easy, 11 medium, 1 hard.#TitleDifficultyFrequency49Group Anagramsmediumcompany favorite128Longest Consecutive Sequencemediumcompany favorite167Two Sum II - Input Array Is Sortedmediumfoundational202Happy Numbereasyfoundational205Isomorphic Stringseasyfrequently asked217Contains Duplicateeasyfoundational242Valid Anagrameasyfoundational290Word Patterneasycommon347Top K Frequent Elementsmediumcompany favorite350Intersection of Two Arrays IIeasyfoundational380Insert Delete GetRandom O(1)mediumcompany favorite381Insert Delete GetRandom O(1) - Duplicates allowedhardcompany favorite383Ransom Noteeasyfoundational387First Unique Character in a Stringeasyfoundational409Longest Palindromeeasycommon438Find All Anagrams in a Stringmediumfrequently asked4544Sum IImediumfrequently asked535Encode and Decode TinyURLmediumcommon560Subarray Sum Equals Kmediumcompany favorite705Design HashSeteasyfrequently asked706Design HashMapeasyfrequently asked811Subdomain Visit Countmediummedium890Find and Replace Patternmediumcommon929Unique Email Addresseseasyhigh1207Unique Number of Occurrenceseasycommon