截止至今LeetCode题目总量已经有1582题，估计将来每年平均增长300题左右，大部分人肯定是刷不完的，所以得有选择地刷LeetCode。

一种公认的刷题策略是按类别刷题，可是每个类别也有许多题，在有限的时间里到底该刷哪些题呢？个人根据LeetCode官方给出的每个题目的出现频率，整理并收录了每个类别里高频出现的题目，对于官方统计频率太低的题目，不予收录，最终得到了这个高频题目表格。

例如，对于下图中题号#275与#270的题目将被收录，并且#275出现频率大于#270；而对于题号#1011与#1182的题目，因为出现频率太低，将不被收录：

撸起键盘加油干！祝大家成功上岸！整理不易，点个赞吧！

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字符串篇-95题(String, 95 problems)

数据日期： 2020/03/26 (此时LeetCode题目数量：1582)
数据来源： LeetCode官方，将不同类别的题目按照官方给的出现频率(Frequency)降序排列，取有频率统计的题。

排序	题号	题目	通过率	难度
1	#3	Longest Substring Without Repeating Characters	0.335	中等
2	#5	Longest Palindromic Substring	0.291	中等
3	#22	Generate Parentheses	0.737	中等
4	#6	ZigZag Conversion	0.472	中等
5	#13	Roman to Integer	0.611	简单
6	#38	Count and Say	0.547	简单
7	#17	Letter Combinations of a Phone Number	0.53	中等
8	#93	Restore IP Addresses	0.462	中等
9	#10	Regular Expression Matching	0.269	困难
10	#72	Edit Distance	0.567	困难
11	#20	Valid Parentheses	0.412	简单
12	#415	Add Strings	0.497	简单
13	#14	Longest Common Prefix	0.367	简单
14	#67	Add Binary	0.523	简单
15	#12	Integer to Roman	0.63	中等
16	#43	Multiply Strings	0.42	中等
17	#521	Longest Uncommon Subsequence I	0.666	简单
18	#557	Reverse Words in a String III	0.699	简单
19	#32	Longest Valid Parentheses	0.3	困难
20	#30	Substring with Concatenation of All Words	0.299	困难
21	#632	Smallest Range Covering Elements from K Lists	0.356	困难
22	#541	Reverse String II	0.525	简单
23	#76	Minimum Window Substring	0.355	困难
24	#214	Shortest Palindrome	0.31	困难
25	#564	Find the Closest Palindrome	0.147	困难
26	#28	Implement strStr()	0.396	简单
27	#657	Robot Return to Origin	0.738	简单
28	#647	Palindromic Substrings	0.613	中等
29	#344	Reverse String	0.696	简单
30	#97	Interleaving String	0.393	困难
31	#49	Group Anagrams	0.612	中等
32	#583	Delete Operation for Two Strings	0.486	中等
33	#8	String to Integer (atoi)	0.194	中等
34	#87	Scramble String	0.459	困难
35	#58	Length of Last Word	0.328	简单
36	#71	Simplify Path	0.388	中等
37	#385	Mini Parser	0.396	中等
38	#929	Unique Email Addresses	0.638	简单
39	#804	Unique Morse Code Words	0.745	简单
40	#91	Decode Ways	0.233	中等
41	#65	Valid Number	0.187	困难
42	#730	Count Different Palindromic Subsequences	0.473	困难
43	#345	Reverse Vowels of a String	0.495	简单
44	#383	Ransom Note	0.521	简单
45	#556	Next Greater Element III	0.302	中等
46	#696	Count Binary Substrings	0.511	简单
47	#459	Repeated Substring Pattern	0.459	简单
48	#686	Repeated String Match	0.337	简单
49	#336	Palindrome Pairs	0.331	困难
50	#539	Minimum Time Difference	0.541	中等
51	#443	String Compression	0.396	简单
52	#115	Distinct Subsequences	0.474	困难
53	#44	Wildcard Matching	0.271	困难
54	#125	Valid Palindrome	0.43	简单
55	#434	Number of Segments in a String	0.342	简单
56	#680	Valid Palindrome II	0.361	简单
57	#537	Complex Number Multiplication	0.682	中等
58	#553	Optimal Division	0.544	中等
59	#606	Construct String from Binary Tree	0.527	简单
60	#678	Valid Parenthesis String	0.304	中等
61	#273	Integer to English Words	0.266	困难
62	#520	Detect Capital	0.549	简单
63	#68	Text Justification	0.429	困难
64	#227	Basic Calculator II	0.349	中等
65	#165	Compare Version Numbers	0.401	中等
66	#387	First Unique Character in a String	0.44	简单
67	#468	Validate IP Address	0.216	中等
68	#126	Word Ladder II	0.318	困难
69	#522	Longest Uncommon Subsequence II	0.317	中等
70	#551	Student Attendance Record I	0.51	简单
71	#527	Word Abbreviation	0.498	困难
72	#151	Reverse Words in a String	0.369	中等
73	#591	Tag Validator	0.297	困难
74	#722	Remove Comments	0.276	中等
75	#186	Reverse Words in a String II	0.738	中等
76	#736	Parse Lisp Expression	0.398	困难
77	#609	Find Duplicate File in System	0.521	中等
78	#1065	Index Pairs of a String	0.5	简单
79	#555	Split Concatenated Strings	0.331	中等
80	#159	Longest Substring with At Most Two Distinct Characters	0.51	中等
81	#1297	Maximum Number of Occurrences of a Substring	0.428	中等
82	#616	Add Bold Tag in String	0.443	中等
83	#1371	Find the Longest Substring Containing Vowels in Even Counts	0.412	中等
84	#249	Group Shifted Strings	0.604	中等
85	#544	Output Contest Matches	0.665	中等
86	#271	Encode and Decode Strings	0.5	中等
87	#293	Flip Game	0.712	简单
88	#157	Read N Characters Given Read4	0.505	简单
89	#161	One Edit Distance	0.316	中等
90	#340	Longest Substring with At Most K Distinct Characters	0.464	困难
91	#635	Design Log Storage System	0.517	中等
92	#158	Read N Characters Given Read4 II - Call multiple times	0.547	困难
93	#681	Next Closest Time	0.477	中等
94	#536	Construct Binary Tree from String	0.513	中等
95	#408	Valid Word Abbreviation	0.307	简单

相关/参考链接

leetcode-cn
leetcode