LeetCode 分类刷题 —— Stack

Stack 的 Tips:

• 括号匹配问题及类似问题。第 20 题，第 921 题，第 1021 题。
• 栈的基本 pop 和 push 操作。第 71 题，第 150 题，第 155 题，第 224 题，第 225 题，第 232 题，第 946 题，第 1047 题。
• 利用栈进行编码问题。第 394 题，第 682 题，第 856 题，第 880 题。
• 单调栈。利用栈维护一个单调递增或者递减的下标数组。第 84 题，第 456 题，第 496 题，第 503 题，第 739 题，第 901 题，第 907 题，第 1019 题。

Title	Solution	Difficulty	Time	Space	收藏
20. Valid Parentheses	Go	Easy	O(log n)	O(1)
42. Trapping Rain Water	Go	Hard	O(n)	O(1)	❤️
71. Simplify Path	Go	Medium	O(n)	O(n)	❤️
84. Largest Rectangle in Histogram	Go	Medium	O(n)	O(n)	❤️
94. Binary Tree Inorder Traversal	Go	Medium	O(n)	O(1)
103. Binary Tree Zigzag Level Order Traversal	Go	Medium	O(n)	O(n)
144. Binary Tree Preorder Traversal	Go	Medium	O(n)	O(1)
145. Binary Tree Postorder Traversal	Go	Hard	O(n)	O(1)
150. Evaluate Reverse Polish Notation	Go	Medium	O(n)	O(1)
155. Min Stack	Go	Easy	O(n)	O(n)
173. Binary Search Tree Iterator	Go	Medium	O(n)	O(1)
224. Basic Calculator	Go	Hard	O(n)	O(n)
225. Implement Stack using Queues	Go	Easy	O(n)	O(n)
232. Implement Queue using Stacks	Go	Easy	O(n)	O(n)
331. Verify Preorder Serialization of a Binary Tree	Go	Medium	O(n)	O(1)
394. Decode String	Go	Medium	O(n)	O(n)
402. Remove K Digits	Go	Medium	O(n)	O(1)
456. 132 Pattern	Go	Medium	O(n)	O(n)
496. Next Greater Element I	Go	Easy	O(n)	O(n)
503. Next Greater Element II	Go	Medium	O(n)	O(n)
636. Exclusive Time of Functions	Go	Medium	O(n)	O(n)
682. Baseball Game	Go	Easy	O(n)	O(n)
726. Number of Atoms	Go	Hard	O(n)	O(n)	❤️
735. Asteroid Collision	Go	Medium	O(n)	O(n)
739. Daily Temperatures	Go	Medium	O(n)	O(n)
844. Backspace String Compare	Go	Easy	O(n)	O(n)
856. Score of Parentheses	Go	Medium	O(n)	O(n)
880. Decoded String at Index	Go	Medium	O(n)	O(n)
895. Maximum Frequency Stack	Go	Hard	O(n)	O(n)
901. Online Stock Span	Go	Medium	O(n)	O(n)
907. Sum of Subarray Minimums	Go	Medium	O(n)	O(n)	❤️
921. Minimum Add to Make Parentheses Valid	Go	Medium	O(n)	O(n)
946. Validate Stack Sequences	Go	Medium	O(n)	O(n)
1003. Check If Word Is Valid After Substitutions	Go	Medium	O(n)	O(1)
1019. Next Greater Node In Linked List	Go	Medium	O(n)	O(1)
1021. Remove Outermost Parentheses	Go	Medium	O(n)	O(1)
1047. Remove All Adjacent Duplicates In String	Go	Medium	O(n)	O(1)