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# Title Acceptance Difficulty
456 132 Pattern 27.8% Medium
439 Ternary Expression Parser 50.0% Medium
402 Remove K Digits 26.1% Medium
394 Decode String 40.4% Medium
385 Mini Parser 29.8% Medium
341 Flatten Nested List Iterator 38.8% Medium
331 Verify Preorder Serialization of a Binary Tree 35.2% Medium
316 Remove Duplicate Letters 28.6% Hard
272 Closest Binary Search Tree Value II 37.7% Hard
255 Verify Preorder Sequence in Binary Search Tree 38.9% Medium
232 Implement Queue using Stacks 35.0% Easy
225 Implement Stack using Queues 31.1% Easy
224 Basic Calculator 25.5% Hard
173 Binary Search Tree Iterator 39.1% Medium
155 Min Stack 26.3% Easy
150 Evaluate Reverse Polish Notation 25.9% Medium
145 Binary Tree Postorder Traversal 38.4% Hard
144 Binary Tree Preorder Traversal 43.1% Medium
103 Binary Tree Zigzag Level Order Traversal 32.3% Medium
94 Binary Tree Inorder Traversal 43.9% Medium
85 Maximal Rectangle 26.1% Hard
84 Largest Rectangle in Histogram 25.7% Hard
71 Simplify Path 24.0% Medium
42 Trapping Rain Water 35.3% Hard
20 Valid Parentheses 32.2% Easy
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