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# Title Acceptance Difficulty
503 Next Greater Element II 46.6% Medium
496 Next Greater Element I 57.5% Easy
456 132 Pattern 28.2% Medium
439 Ternary Expression Parser 49.9% Medium
402 Remove K Digits 26.1% Medium
394 Decode String 40.8% Medium
385 Mini Parser 30.1% Medium
341 Flatten Nested List Iterator 40.0% Medium
331 Verify Preorder Serialization of a Binary Tree 35.6% Medium
316 Remove Duplicate Letters 29.0% Hard
272 Closest Binary Search Tree Value II 38.2% Hard
255 Verify Preorder Sequence in Binary Search Tree 39.4% Medium
232 Implement Queue using Stacks 35.7% Easy
225 Implement Stack using Queues 31.8% Easy
224 Basic Calculator 26.1% Hard
173 Binary Search Tree Iterator 40.0% Medium
155 Min Stack 27.2% Easy
150 Evaluate Reverse Polish Notation 26.4% Medium
145 Binary Tree Postorder Traversal 39.1% Hard
144 Binary Tree Preorder Traversal 43.8% Medium
103 Binary Tree Zigzag Level Order Traversal 33.2% Medium
94 Binary Tree Inorder Traversal 44.9% Medium
85 Maximal Rectangle 26.8% Hard
84 Largest Rectangle in Histogram 26.0% Hard
71 Simplify Path 24.5% Medium
42 Trapping Rain Water 35.9% Hard
20 Valid Parentheses 32.7% Easy
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