Title Acceptance Level Intersection of Two Arrays 62.5% Easy Move Zeroes 57.8% Easy Merge Two Sorted Lists 53.5% Easy Best Time to Buy and Sell Stock 50.5% Easy Two Sum 45.6% Easy Min Stack 44.5% Easy Max Stack 42.6% Easy String Compression 41.3% Easy Merge Sorted Array 39.4% Easy Valid Parentheses 39.0% Easy Sqrt(x) 33.9% Easy Reverse Integer 25.8% Easy Find All Duplicates in an Array 67.8% Medium Generate Parentheses 62.7% Medium Subsets 62.0% Medium Product of Array Except Self 60.1% Medium Convert Binary Search Tree to Sorted Doubly Linked List 59.1% Medium Car Pooling 56.7% Medium Rotate Image 56.7% Medium Number of Distinct Islands 56.0% Medium Missing Element in Sorted Array 54.5% Medium Time Based Key-Value Store 53.1% Medium Flatten Nested List Iterator 52.9% Medium Container With Most Water 50.8% Medium Swap Nodes in Pairs 50.4% Medium Find Duplicate Subtrees 50.2% Medium Convert Sorted List to Binary Search Tree 47.7% Medium Perfect Squares 47.4% Medium Number of Islands 46.8% Medium Letter Combinations of a Phone Number 46.8% Medium Flatten 2D Vector 45.7% Medium Meeting Rooms II 45.7% Medium Permutation in String 44.4% Medium Find Peak Element 43.3% Medium Asteroid Collision 41.0% Medium Range Sum Query 2D - Immutable 38.6% Medium Largest BST Subtree 35.8% Medium Word Search 35.6% Medium Add Two Numbers 33.9% Medium LRU Cache 33.2% Medium Water and Jug Problem 30.6% Medium Word Ladder 29.6% Medium Decode Ways 24.7% Medium Smallest Range Covering Elements from K Lists 52.4% Hard Trapping Rain Water 48.9% Hard Design Search Autocomplete System 44.7% Hard Sliding Window Maximum 43.0% Hard Merge k Sorted Lists 40.2% Hard Minimum Window Substring 34.6% Hard Read N Characters Given Read4 II - Call multiple times 33.8% Hard Text Justification 27.7% Hard Regular Expression Matching 26.8% Hard Word Ladder II 22.1% Hard