[Leetcode] High Frequency Problems, Stack (High Frequency Problems, Stack)

Up to now, the total number of LeetCode questions has been 1582题, and it is estimated that the average annual growth will be 300题around in the future . Most people will definitely be 刷不完的, so you have to selectively brush LeetCode.

A generally accepted strategy for brushing questions is 按类别刷题, but each category also has many questions, in a limited time 到底该刷哪些题呢? Individuals sorted out and included the topics in each category according LeetCode官方to each topic given . For topics whose official statistical frequency was too low, they were not included, and finally got this high-frequency topic table.出现频率高频出现

For example, the title of the title number #275and #270in the following figure will be included, and the #275frequency of occurrence is greater than #270; for the title of the title number #1011and #1182, because the occurrence frequency is too low, it will not be included:

Pick up the keyboard and work hard! I wish you all a successful landing! It's not easy to organize, please like it!

---

Stack-33 problems (Stack, 33 problems)

Date of data: 2020/03/26 (LeetCode question number at this time: 1582)
Data source: LeetCode official. Questions of different categories are arranged in descending order according to the official frequency (Frequency), and questions with frequency statistics are selected.

Sort	Question number	topic	Passing rate	Difficulty
1	#42	Trapping Rain Water	0.495	difficult
2	#85	Maximal Rectangle	0.449	difficult
3	#94	Binary Tree Inorder Traversal	0.707	medium
4	#20	Valid Parentheses	0.412	simple
5	#225	Implement Stack using Queues	0.643	simple
6	#739	Daily Temperatures	0.595	medium
7	#394	Decode String	0.493	medium
8	#316	Remove Duplicate Letters	0.378	difficult
9	#155	My Stack	0.522	simple
10	#144	Binary Tree Preorder Traversal	0.648	medium
11	#224	Basic Calculator	0.371	difficult
12	#496	Next Greater Element I	0.634	simple
13	#232	Implement Queue using Stacks	0.636	simple
14	#145	Binary Tree Postorder Traversal	0.707	difficult
15	#71	Simplify Path	0.388	medium
16	#385	Mini Parser	0.396	medium
17	#84	Largest Rectangle in Histogram	0.392	difficult
18	#173	Binary Search Tree Iterator	0.718	medium
19	#682	Baseball Game	0.664	simple
20	#503	Next Greater Element II	0.536	medium
21	#726	Number of Atoms	0.437	difficult
22	#103	Binary Tree Zigzag Level Order Traversal	0.54	medium
23	#341	Flatten Nested List Iterator	0.626	medium
24	#456	132 Pattern	0.263	medium
25	#402	Remove K Digits	0.284	medium
26	#636	Exclusive Time of Functions	0.499	medium
27	#331	Verify Preorder Serialization of a Binary Tree	0.44	medium
28	#591	Tag Validator	0.297	difficult
29	#150	Evaluate Reverse Polish Notation	0.495	medium
30	#735	Asteroid Collision	0.378	medium
31	#439	Ternary Expression Parser	0.548	medium
32	#255	Verify Preorder Sequence in Binary Search Tree	0.458	medium
33	#272	Closest Binary Search Tree Value II	0.587	difficult

Related/reference links

leetcode-cn
leetcode