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# Title Acceptance Difficulty
503 Next Greater Element II 47.3% Medium
496 Next Greater Element I 57.7% Easy
456 132 Pattern 28.2% Medium
439 Ternary Expression Parser 50.4% Medium
402 Remove K Digits 26.2% Medium
394 Decode String 40.8% Medium
385 Mini Parser 30.0% Medium
341 Flatten Nested List Iterator 40.3% Medium
331 Verify Preorder Serialization of a Binary Tree 35.6% Medium
316 Remove Duplicate Letters 29.1% Hard
272 Closest Binary Search Tree Value II 38.3% Hard
255 Verify Preorder Sequence in Binary Search Tree 39.6% Medium
232 Implement Queue using Stacks 35.9% Easy
225 Implement Stack using Queues 32.0% Easy
224 Basic Calculator 26.3% Hard
173 Binary Search Tree Iterator 40.3% Medium
155 Min Stack 27.5% Easy
150 Evaluate Reverse Polish Notation 26.5% Medium
145 Binary Tree Postorder Traversal 39.3% Hard
144 Binary Tree Preorder Traversal 44.1% Medium
103 Binary Tree Zigzag Level Order Traversal 33.4% Medium
94 Binary Tree Inorder Traversal 45.3% Medium
85 Maximal Rectangle 27.0% Hard
84 Largest Rectangle in Histogram 26.1% Hard
71 Simplify Path 24.7% Medium
42 Trapping Rain Water 36.0% Hard
20 Valid Parentheses 32.9% Easy
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