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# Title Acceptance Difficulty
636 Exclusive Time of Functions 38.2% Medium
591 Tag Validator 26.8% Hard
503 Next Greater Element II 47.1% Medium
496 Next Greater Element I 56.8% Easy
456 132 Pattern 28.7% Medium
439 Ternary Expression Parser 50.4% Medium
402 Remove K Digits 26.2% Medium
394 Decode String 41.2% Medium
385 Mini Parser 30.4% Medium
341 Flatten Nested List Iterator 41.2% Medium
331 Verify Preorder Serialization of a Binary Tree 36.1% Medium
316 Remove Duplicate Letters 29.3% Hard
272 Closest Binary Search Tree Value II 38.7% Hard
255 Verify Preorder Sequence in Binary Search Tree 40.1% Medium
232 Implement Queue using Stacks 36.5% Easy
225 Implement Stack using Queues 32.7% Easy
224 Basic Calculator 26.9% Hard
173 Binary Search Tree Iterator 41.1% Medium
155 Min Stack 28.4% Easy
150 Evaluate Reverse Polish Notation 27.1% Medium
145 Binary Tree Postorder Traversal 40.0% Hard
144 Binary Tree Preorder Traversal 44.8% Medium
103 Binary Tree Zigzag Level Order Traversal 34.3% Medium
94 Binary Tree Inorder Traversal 46.3% Medium
85 Maximal Rectangle 27.7% Hard
84 Largest Rectangle in Histogram 26.6% Hard
71 Simplify Path 25.1% Medium
42 Trapping Rain Water 36.6% Hard
20 Valid Parentheses 33.3% Easy
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