
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
