stack

2020/08/13 71 - Simplify Path
2020/08/13 32 - Longest Valid Parentheses
2020/05/19 901 - Onine Stock Span
2020/05/13 402 - Remove K Digits
2020/05/09 733 - Flood Fill
2020/04/10 155 - Min Stack
2020/03/24 85 - Maximal Rectangle
2020/03/23 84 - Largest Rectangle in Histogram