Title Acceptance Level Destination City 77.3% Easy Check If a Word Occurs As a Prefix of Any Word in a Sentence 64.6% Easy Intersection of Two Arrays 62.5% Easy Reverse Linked List 62.5% Easy Valid Anagram 56.9% Easy Minimum Index Sum of Two Lists 50.7% Easy Two Sum 45.6% Easy String Compression 41.3% Easy Isomorphic Strings 39.8% Easy Longest Common Prefix 35.4% Easy Active Businesses 68.5% Medium Letter Case Permutation 64.6% Medium Generate Parentheses 62.7% Medium Top K Frequent Elements 61.2% Medium Group Anagrams 56.9% Medium Combination Sum 56.1% Medium Filter Restaurants by Vegan-Friendly & Price and Distance 54.6% Medium Top K Frequent Words 51.8% Medium Decode String 50.0% Medium Insert Delete GetRandom O(1) 47.5% Medium Meeting Rooms II 45.7% Medium Random Pick with Weight 43.9% Medium Course Schedule 43.1% Medium Word Break 40.1% Medium Merge Intervals 39.3% Medium Reconstruct Itinerary 36.7% Medium Longest Substring Without Repeating Characters 30.4% Medium Design Twitter 30.3% Medium Word Ladder 29.6% Medium Word Frequency 25.8% Medium Reverse Words in a String 21.9% Medium Sliding Window Maximum 43.0% Hard The Skyline Problem 34.6% Hard Insert Delete GetRandom O(1) - Duplicates allowed 34.1% Hard Integer to English Words 27.1% Hard Word Ladder II 22.1% Hard Find the Closest Palindrome 19.7% Hard