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# Title Acceptance Difficulty
636 Exclusive Time of Functions 42.4% Medium
591 Tag Validator 29.0% Hard
503 Next Greater Element II 47.1% Medium
496 Next Greater Element I 56.8% Easy
456 132 Pattern 28.8% Medium
439 Ternary Expression Parser 50.8% Medium
402 Remove K Digits 26.1% Medium
394 Decode String 41.4% Medium
385 Mini Parser 30.6% Medium
341 Flatten Nested List Iterator 41.9% Medium
331 Verify Preorder Serialization of a Binary Tree 36.4% Medium
316 Remove Duplicate Letters 29.6% Hard
272 Closest Binary Search Tree Value II 39.1% Hard
255 Verify Preorder Sequence in Binary Search Tree 40.3% Medium
232 Implement Queue using Stacks 36.9% Easy
225 Implement Stack using Queues 33.1% Easy
224 Basic Calculator 27.4% Hard
173 Binary Search Tree Iterator 41.7% Medium
155 Min Stack 29.0% Easy
150 Evaluate Reverse Polish Notation 27.4% Medium
145 Binary Tree Postorder Traversal 40.5% Hard
144 Binary Tree Preorder Traversal 45.3% Medium
103 Binary Tree Zigzag Level Order Traversal 34.9% Medium
94 Binary Tree Inorder Traversal 47.1% Medium
85 Maximal Rectangle 28.2% Hard
84 Largest Rectangle in Histogram 26.9% Hard
71 Simplify Path 25.5% Medium
42 Trapping Rain Water 36.9% Hard
20 Valid Parentheses 33.5% Easy