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# Title Acceptance Difficulty
503 Next Greater Element II 46.3% Medium
496 Next Greater Element I 58.9% Easy
456 132 Pattern 28.0% Medium
439 Ternary Expression Parser 50.2% Medium
402 Remove K Digits 26.0% Medium
394 Decode String 40.6% Medium
385 Mini Parser 30.0% Medium
341 Flatten Nested List Iterator 39.4% Medium
331 Verify Preorder Serialization of a Binary Tree 35.4% Medium
316 Remove Duplicate Letters 28.8% Hard
272 Closest Binary Search Tree Value II 37.9% Hard
255 Verify Preorder Sequence in Binary Search Tree 39.3% Medium
232 Implement Queue using Stacks 35.3% Easy
225 Implement Stack using Queues 31.4% Easy
224 Basic Calculator 25.9% Hard
173 Binary Search Tree Iterator 39.6% Medium
155 Min Stack 26.8% Easy
150 Evaluate Reverse Polish Notation 26.1% Medium
145 Binary Tree Postorder Traversal 38.8% Hard
144 Binary Tree Preorder Traversal 43.5% Medium
103 Binary Tree Zigzag Level Order Traversal 32.7% Medium
94 Binary Tree Inorder Traversal 44.4% Medium
85 Maximal Rectangle 26.5% Hard
84 Largest Rectangle in Histogram 25.8% Hard
71 Simplify Path 24.3% Medium
42 Trapping Rain Water 35.6% Hard
20 Valid Parentheses 32.5% Easy
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