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# Title Acceptance Difficulty
726 Number of Atoms 45.6% Hard
682 Baseball Game 58.7% Easy
636 Exclusive Time of Functions 43.9% Medium
591 Tag Validator 30.1% Hard
503 Next Greater Element II 47.3% Medium
496 Next Greater Element I 56.7% Easy
456 132 Pattern 28.4% Medium
439 Ternary Expression Parser 51.2% Medium
402 Remove K Digits 26.0% Medium
394 Decode String 41.7% Medium
385 Mini Parser 30.7% Medium
341 Flatten Nested List Iterator 42.3% Medium
331 Verify Preorder Serialization of a Binary Tree 36.7% Medium
316 Remove Duplicate Letters 29.9% Hard
272 Closest Binary Search Tree Value II 39.4% Hard
255 Verify Preorder Sequence in Binary Search Tree 40.7% Medium
232 Implement Queue using Stacks 37.4% Easy
225 Implement Stack using Queues 33.6% Easy
224 Basic Calculator 27.8% Hard
173 Binary Search Tree Iterator 42.4% Medium
155 Min Stack 29.7% Easy
150 Evaluate Reverse Polish Notation 27.7% Medium
145 Binary Tree Postorder Traversal 40.9% Hard
144 Binary Tree Preorder Traversal 45.7% Medium
103 Binary Tree Zigzag Level Order Traversal 35.5% Medium
94 Binary Tree Inorder Traversal 47.8% Medium
85 Maximal Rectangle 28.8% Hard
84 Largest Rectangle in Histogram 27.1% Hard
71 Simplify Path 25.8% Medium
42 Trapping Rain Water 37.2% Hard
20 Valid Parentheses 33.7% Easy