Valid Parentheses |
简单 |
Trapping Rain Water |
困难 |
Simplify Path |
中等 |
Largest Rectangle in Histogram |
困难 |
Maximal Rectangle |
困难 |
Binary Tree Inorder Traversal |
中等 |
Binary Tree Zigzag Level Order Traversal |
中等 |
Binary Tree Preorder Traversal |
中等 |
Binary Tree Postorder Traversal |
困难 |
Evaluate Reverse Polish Notation |
中等 |
Min Stack |
简单 |
Binary Search Tree Iterator |
中等 |
Flatten Nested List Iterator |
中等 |
Mini Parser |
中等 |
Decode String |
中等 |
Remove K Digits |
中等 |
132 Pattern |
中等 |
Next Greater Element I |
简单 |
Next Greater Element II |
中等 |
Tag Validator |
困难 |
Exclusive Time of Functions |
中等 |
Baseball Game |
简单 |
Number of Atoms |
困难 |
Asteroid Collision |
中等 |
Daily Temperatures |
中等 |
Basic Calculator IV |
困难 |
Basic Calculator |
困难 |
Implement Stack using Queues |
简单 |
Implement Queue using Stacks |
简单 |
Backspace String Compare |
简单 |
Remove Duplicate Letters |
困难 |
Verify Preorder Serialization of a Binary Tree |
中等 |
Car Fleet |
中等 |
Score of Parentheses |
中等 |
Decoded String at Index |
中等 |
Maximum Frequency Stack |
困难 |
Online Stock Span |
中等 |
Sum of Subarray Minimums |
中等 |