chapter 20: String¶
- Stack - Easy
- 20. Valid Parentheses
- 32. Longest Valid Parentheses
- 71. Simplify Path
- 84. Largest Rectangle in Histogram
- 85. Maximal Rectangle
- 94. Binary tree inorder traversal
- 150. Evaluate Reverse Polish notation
- 155. Min Stack
- 1224. Basic Caculator
- 225. Implement stack using queues
- 227. Basic Calculator 2
- 232. Implement queue using stacks
- 316. Remove duplicate letters
- 341. Flatten nested list iterator
- Stack - Medium
- Stack - Hard