## 字符串

| \# | 题名 | 题解 | 通过率 | 难度 | 出现频率   |
|------|----------------------|-----|--------|----|--------|
|5|[最长回文子串](https://leetcode-cn.com/problems/longest-palindromic-substring)   |[287](https://leetcode-cn.com/problems/longest-palindromic-substring/solution)|27.9%|中等|69.92%|
|72|[编辑距离](https://leetcode-cn.com/problems/edit-distance)   |[68](https://leetcode-cn.com/problems/edit-distance/solution)|55.3%|困难|66.63%|
|3|[无重复字符的最长子串](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters)   |[626](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/solution)|32.3%|中等|62.06%|
|93|[复原IP地址](https://leetcode-cn.com/problems/restore-ip-addresses)   |[77](https://leetcode-cn.com/problems/restore-ip-addresses/solution)|45.0%|中等|56.77%|
|583|[两个字符串的删除操作](https://leetcode-cn.com/problems/delete-operation-for-two-strings)   |[11](https://leetcode-cn.com/problems/delete-operation-for-two-strings/solution)|45.8%|中等|53.33%|
|443|[压缩字符串](https://leetcode-cn.com/problems/string-compression)   |[45](https://leetcode-cn.com/problems/string-compression/solution)|38.0%|简单|51.05%|
|1106|[解析布尔表达式](https://leetcode-cn.com/problems/parsing-a-boolean-expression)   |[18](https://leetcode-cn.com/problems/parsing-a-boolean-expression/solution)|54.5%|困难|50.02%|
|415|[字符串相加](https://leetcode-cn.com/problems/add-strings)   |[84](https://leetcode-cn.com/problems/add-strings/solution)|48.6%|简单|49.26%|
|97|[交错字符串](https://leetcode-cn.com/problems/interleaving-string)   |[30](https://leetcode-cn.com/problems/interleaving-string/solution)|37.9%|困难|46.96%|
|10|[正则表达式匹配](https://leetcode-cn.com/problems/regular-expression-matching)   |[130](https://leetcode-cn.com/problems/regular-expression-matching/solution)|25.4%|困难|46.93%|
|536|[从字符串生成二叉树](https://leetcode-cn.com/problems/construct-binary-tree-from-string)   |[6](https://leetcode-cn.com/problems/construct-binary-tree-from-string/solution)|47.3%|中等|46.88%|
|833|[字符串中的查找与替换](https://leetcode-cn.com/problems/find-and-replace-in-string)   |[11](https://leetcode-cn.com/problems/find-and-replace-in-string/solution)|35.5%|中等|46.55%|
|1096|[花括号展开 II](https://leetcode-cn.com/problems/brace-expansion-ii)   |[9](https://leetcode-cn.com/problems/brace-expansion-ii/solution)|45.5%|困难|46.35%|
|20|[有效的括号](https://leetcode-cn.com/problems/valid-parentheses)   |[469](https://leetcode-cn.com/problems/valid-parentheses/solution)|40.3%|简单|45.79%|
|214|[最短回文串](https://leetcode-cn.com/problems/shortest-palindrome)   |[26](https://leetcode-cn.com/problems/shortest-palindrome/solution)|30.9%|困难|45.32%|
|632|[最小区间](https://leetcode-cn.com/problems/smallest-range-covering-elements-from-k-lists)   |[19](https://leetcode-cn.com/problems/smallest-range-covering-elements-from-k-lists/solution)|33.5%|困难|44.86%|
|165|[比较版本号](https://leetcode-cn.com/problems/compare-version-numbers)   |[58](https://leetcode-cn.com/problems/compare-version-numbers/solution)|37.2%|中等|44.54%|
|736|[Lisp 语法解析](https://leetcode-cn.com/problems/parse-lisp-expression)   |[5](https://leetcode-cn.com/problems/parse-lisp-expression/solution)|42.5%|困难|44.16%|
|76|[最小覆盖子串](https://leetcode-cn.com/problems/minimum-window-substring)   |[47](https://leetcode-cn.com/problems/minimum-window-substring/solution)|34.8%|困难|43.93%|
|468|[验证IP地址](https://leetcode-cn.com/problems/validate-ip-address)   |[24](https://leetcode-cn.com/problems/validate-ip-address/solution)|20.7%|中等|42.93%|
|899|[有序队列](https://leetcode-cn.com/problems/orderly-queue)   |[8](https://leetcode-cn.com/problems/orderly-queue/solution)|49.4%|困难|42.61%|
|758|[字符串中的加粗单词](https://leetcode-cn.com/problems/bold-words-in-string)   |[9](https://leetcode-cn.com/problems/bold-words-in-string/solution)|40.4%|简单|42.5%|
|32|[最长有效括号](https://leetcode-cn.com/problems/longest-valid-parentheses)   |[106](https://leetcode-cn.com/problems/longest-valid-parentheses/solution)|28.9%|困难|41.82%|
|91|[解码方法](https://leetcode-cn.com/problems/decode-ways)   |[111](https://leetcode-cn.com/problems/decode-ways/solution)|22.5%|中等|41.4%|
|44|[通配符匹配](https://leetcode-cn.com/problems/wildcard-matching)   |[51](https://leetcode-cn.com/problems/wildcard-matching/solution)|25.6%|困难|39.83%|
|527|[单词缩写](https://leetcode-cn.com/problems/word-abbreviation)   |[7](https://leetcode-cn.com/problems/word-abbreviation/solution)|47.6%|困难|37.78%|
|22|[括号生成](https://leetcode-cn.com/problems/generate-parentheses)   |[235](https://leetcode-cn.com/problems/generate-parentheses/solution)|72.6%|中等|37.77%|
|17|[电话号码的字母组合](https://leetcode-cn.com/problems/letter-combinations-of-a-phone-number)   |[255](https://leetcode-cn.com/problems/letter-combinations-of-a-phone-number/solution)|51.7%|中等|37.41%|
|555|[分割连接字符串](https://leetcode-cn.com/problems/split-concatenated-strings)   |[5](https://leetcode-cn.com/problems/split-concatenated-strings/solution)|31.3%|中等|37.3%|
|273|[整数转换英文表示](https://leetcode-cn.com/problems/integer-to-english-words)   |[24](https://leetcode-cn.com/problems/integer-to-english-words/solution)|25.3%|困难|37.3%|
|43|[字符串相乘](https://leetcode-cn.com/problems/multiply-strings)   |[114](https://leetcode-cn.com/problems/multiply-strings/solution)|41.1%|中等|36.81%|
|227|[基本计算器 II](https://leetcode-cn.com/problems/basic-calculator-ii)   |[40](https://leetcode-cn.com/problems/basic-calculator-ii/solution)|34.1%|中等|36.45%|
|336|[回文对](https://leetcode-cn.com/problems/palindrome-pairs)   |[7](https://leetcode-cn.com/problems/palindrome-pairs/solution)|32.3%|困难|35.51%|
|539|[最小时间差](https://leetcode-cn.com/problems/minimum-time-difference)   |[13](https://leetcode-cn.com/problems/minimum-time-difference/solution)|52.0%|中等|35.42%|
|8|[字符串转换整数 (atoi)](https://leetcode-cn.com/problems/string-to-integer-atoi)   |[318](https://leetcode-cn.com/problems/string-to-integer-atoi/solution)|18.7%|中等|33.91%|
|556|[下一个更大元素 III](https://leetcode-cn.com/problems/next-greater-element-iii)   |[17](https://leetcode-cn.com/problems/next-greater-element-iii/solution)|28.4%|中等|33.81%|
|126|[单词接龙 II](https://leetcode-cn.com/problems/word-ladder-ii)   |[35](https://leetcode-cn.com/problems/word-ladder-ii/solution)|30.3%|困难|33.35%|
|647|[回文子串](https://leetcode-cn.com/problems/palindromic-substrings)   |[48](https://leetcode-cn.com/problems/palindromic-substrings/solution)|59.7%|中等|33.14%|
|65|[有效数字](https://leetcode-cn.com/problems/valid-number)   |[50](https://leetcode-cn.com/problems/valid-number/solution)|17.2%|困难|33.02%|
|30|[串联所有单词的子串](https://leetcode-cn.com/problems/substring-with-concatenation-of-all-words)   |[59](https://leetcode-cn.com/problems/substring-with-concatenation-of-all-words/solution)|28.4%|困难|33%|
|1071|[字符串的最大公因子](https://leetcode-cn.com/problems/greatest-common-divisor-of-strings)   |[27](https://leetcode-cn.com/problems/greatest-common-divisor-of-strings/solution)|48.7%|简单|32.78%|
|385|[迷你语法分析器](https://leetcode-cn.com/problems/mini-parser)   |[14](https://leetcode-cn.com/problems/mini-parser/solution)|39.7%|中等|32.08%|
|1169|[查询无效交易](https://leetcode-cn.com/problems/invalid-transactions)   |[20](https://leetcode-cn.com/problems/invalid-transactions/solution)|27.6%|中等|31.88%|
|537|[复数乘法](https://leetcode-cn.com/problems/complex-number-multiplication)   |[19](https://leetcode-cn.com/problems/complex-number-multiplication/solution)|67.1%|中等|30.94%|
|87|[扰乱字符串](https://leetcode-cn.com/problems/scramble-string)   |[20](https://leetcode-cn.com/problems/scramble-string/solution)|44.7%|困难|30.94%|
|6|[Z 字形变换](https://leetcode-cn.com/problems/zigzag-conversion)   |[226](https://leetcode-cn.com/problems/zigzag-conversion/solution)|46.0%|中等|29.2%|
|557|[反转字符串中的单词 III](https://leetcode-cn.com/problems/reverse-words-in-a-string-iii)   |[131](https://leetcode-cn.com/problems/reverse-words-in-a-string-iii/solution)|68.6%|简单|29.03%|
|678|[有效的括号字符串](https://leetcode-cn.com/problems/valid-parenthesis-string)   |[25](https://leetcode-cn.com/problems/valid-parenthesis-string/solution)|28.8%|中等|29.02%|
|831|[隐藏个人信息](https://leetcode-cn.com/problems/masking-personal-information)   |[8](https://leetcode-cn.com/problems/masking-personal-information/solution)|36.7%|中等|28.35%|
|271|[字符串的编码与解码](https://leetcode-cn.com/problems/encode-and-decode-strings)   |[8](https://leetcode-cn.com/problems/encode-and-decode-strings/solution)|48.6%|中等|27.97%|
|722|[删除注释](https://leetcode-cn.com/problems/remove-comments)   |[17](https://leetcode-cn.com/problems/remove-comments/solution)|26.5%|中等|27.47%|
|14|[最长公共前缀](https://leetcode-cn.com/problems/longest-common-prefix)   |[333](https://leetcode-cn.com/problems/longest-common-prefix/solution)|35.6%|简单|27.42%|
|544|[输出比赛匹配对](https://leetcode-cn.com/problems/output-contest-matches)   |[12](https://leetcode-cn.com/problems/output-contest-matches/solution)|64.7%|中等|26.08%|
|1247|[交换字符使得字符串相同](https://leetcode-cn.com/problems/minimum-swaps-to-make-strings-equal)   |[34](https://leetcode-cn.com/problems/minimum-swaps-to-make-strings-equal/solution)|51.6%|中等|26.01%|
|459|[重复的子字符串](https://leetcode-cn.com/problems/repeated-substring-pattern)   |[38](https://leetcode-cn.com/problems/repeated-substring-pattern/solution)|44.2%|简单|25.7%|
|67|[二进制求和](https://leetcode-cn.com/problems/add-binary)   |[206](https://leetcode-cn.com/problems/add-binary/solution)|51.6%|简单|25.66%|
|157|[用 Read4 读取 N 个字符](https://leetcode-cn.com/problems/read-n-characters-given-read4)   |[7](https://leetcode-cn.com/problems/read-n-characters-given-read4/solution)|52.3%|简单|25.65%|
|38|[报数](https://leetcode-cn.com/problems/count-and-say)   |[272](https://leetcode-cn.com/problems/count-and-say/solution)|53.7%|简单|25.38%|
|28|[实现 strStr()](https://leetcode-cn.com/problems/implement-strstr)   |[274](https://leetcode-cn.com/problems/implement-strstr/solution)|39.2%|简单|25%|
|12|[整数转罗马数字](https://leetcode-cn.com/problems/integer-to-roman)   |[187](https://leetcode-cn.com/problems/integer-to-roman/solution)|62.0%|中等|24.89%|
|13|[罗马数字转整数](https://leetcode-cn.com/problems/roman-to-integer)   |[462](https://leetcode-cn.com/problems/roman-to-integer/solution)|59.9%|简单|24.74%|
|186|[翻转字符串里的单词 II](https://leetcode-cn.com/problems/reverse-words-in-a-string-ii)   |[18](https://leetcode-cn.com/problems/reverse-words-in-a-string-ii/solution)|70.0%|中等|23.79%|
|541|[反转字符串 II](https://leetcode-cn.com/problems/reverse-string-ii)   |[38](https://leetcode-cn.com/problems/reverse-string-ii/solution)|50.4%|简单|23.52%|
|161|[相隔为 1 的编辑距离](https://leetcode-cn.com/problems/one-edit-distance)   |[14](https://leetcode-cn.com/problems/one-edit-distance/solution)|31.2%|中等|22.92%|
|344|[反转字符串](https://leetcode-cn.com/problems/reverse-string)   |[195](https://leetcode-cn.com/problems/reverse-string/solution)|68.2%|简单|22.86%|
|408|[有效单词缩写](https://leetcode-cn.com/problems/valid-word-abbreviation)   |[6](https://leetcode-cn.com/problems/valid-word-abbreviation/solution)|29.0%|简单|22.84%|
|151|[翻转字符串里的单词](https://leetcode-cn.com/problems/reverse-words-in-a-string)   |[86](https://leetcode-cn.com/problems/reverse-words-in-a-string/solution)|33.9%|中等|22.12%|
|1023|[驼峰式匹配](https://leetcode-cn.com/problems/camelcase-matching)   |[10](https://leetcode-cn.com/problems/camelcase-matching/solution)|51.6%|中等|21.59%|
|125|[验证回文串](https://leetcode-cn.com/problems/valid-palindrome)   |[167](https://leetcode-cn.com/problems/valid-palindrome/solution)|41.7%|简单|21.42%|
|564|[寻找最近的回文数](https://leetcode-cn.com/problems/find-the-closest-palindrome)   |[14](https://leetcode-cn.com/problems/find-the-closest-palindrome/solution)|13.3%|困难|20.74%|
|616|[给字符串添加加粗标签](https://leetcode-cn.com/problems/add-bold-tag-in-string)   |[12](https://leetcode-cn.com/problems/add-bold-tag-in-string/solution)|42.9%|中等|20.34%|
|1156|[单字符重复子串的最大长度](https://leetcode-cn.com/problems/swap-for-longest-repeated-character-substring)   |[20](https://leetcode-cn.com/problems/swap-for-longest-repeated-character-substring/solution)|41.2%|中等|20.08%|
|606|[根据二叉树创建字符串](https://leetcode-cn.com/problems/construct-string-from-binary-tree)   |[36](https://leetcode-cn.com/problems/construct-string-from-binary-tree/solution)|51.5%|简单|20.08%|
|686|[重复叠加字符串匹配](https://leetcode-cn.com/problems/repeated-string-match)   |[22](https://leetcode-cn.com/problems/repeated-string-match/solution)|32.6%|简单|19.3%|
|71|[简化路径](https://leetcode-cn.com/problems/simplify-path)   |[86](https://leetcode-cn.com/problems/simplify-path/solution)|38.0%|中等|19.23%|
|387|[字符串中的第一个唯一字符](https://leetcode-cn.com/problems/first-unique-character-in-a-string)   |[104](https://leetcode-cn.com/problems/first-unique-character-in-a-string/solution)|42.2%|简单|18.89%|
|1081|[不同字符的最小子序列](https://leetcode-cn.com/problems/smallest-subsequence-of-distinct-characters)   |[18](https://leetcode-cn.com/problems/smallest-subsequence-of-distinct-characters/solution)|43.0%|中等|18.45%|
|49|[字母异位词分组](https://leetcode-cn.com/problems/group-anagrams)   |[79](https://leetcode-cn.com/problems/group-anagrams/solution)|59.7%|中等|18.33%|
|916|[单词子集](https://leetcode-cn.com/problems/word-subsets)   |[7](https://leetcode-cn.com/problems/word-subsets/solution)|37.5%|中等|18.13%|
|520|[检测大写字母](https://leetcode-cn.com/problems/detect-capital)   |[61](https://leetcode-cn.com/problems/detect-capital/solution)|54.1%|简单|17.95%|
|115|[不同的子序列](https://leetcode-cn.com/problems/distinct-subsequences)   |[34](https://leetcode-cn.com/problems/distinct-subsequences/solution)|45.7%|困难|17.44%|
|340|[至多包含 K 个不同字符的最长子串](https://leetcode-cn.com/problems/longest-substring-with-at-most-k-distinct-characters)   |[15](https://leetcode-cn.com/problems/longest-substring-with-at-most-k-distinct-characters/solution)|45.1%|困难|17.16%|
|1234|[替换子串得到平衡字符串](https://leetcode-cn.com/problems/replace-the-substring-for-balanced-string)   |[22](https://leetcode-cn.com/problems/replace-the-substring-for-balanced-string/solution)|26.8%|中等|17.02%|
|434|[字符串中的单词数](https://leetcode-cn.com/problems/number-of-segments-in-a-string)   |[34](https://leetcode-cn.com/problems/number-of-segments-in-a-string/solution)|33.1%|简单|16.96%|
|159|[至多包含两个不同字符的最长子串](https://leetcode-cn.com/problems/longest-substring-with-at-most-two-distinct-characters)   |[16](https://leetcode-cn.com/problems/longest-substring-with-at-most-two-distinct-characters/solution)|52.1%|中等|16.8%|
|709|[转换成小写字母](https://leetcode-cn.com/problems/to-lower-case)   |[83](https://leetcode-cn.com/problems/to-lower-case/solution)|75.1%|简单|16.61%|
|1108|[IP 地址无效化](https://leetcode-cn.com/problems/defanging-an-ip-address)   |[149](https://leetcode-cn.com/problems/defanging-an-ip-address/solution)|80.2%|简单|15.95%|
|856|[括号的分数](https://leetcode-cn.com/problems/score-of-parentheses)   |[27](https://leetcode-cn.com/problems/score-of-parentheses/solution)|56.4%|中等|15.88%|
|383|[赎金信](https://leetcode-cn.com/problems/ransom-note)   |[51](https://leetcode-cn.com/problems/ransom-note/solution)|51.2%|简单|15.05%|
|767|[重构字符串](https://leetcode-cn.com/problems/reorganize-string)   |[17](https://leetcode-cn.com/problems/reorganize-string/solution)|37.9%|中等|14.96%|
|804|[唯一摩尔斯密码词](https://leetcode-cn.com/problems/unique-morse-code-words)   |[79](https://leetcode-cn.com/problems/unique-morse-code-words/solution)|73.6%|简单|14.84%|
|1177|[构建回文串检测](https://leetcode-cn.com/problems/can-make-palindrome-from-substring)   |[14](https://leetcode-cn.com/problems/can-make-palindrome-from-substring/solution)|18.9%|中等|14.65%|
|917|[仅仅反转字母](https://leetcode-cn.com/problems/reverse-only-letters)   |[38](https://leetcode-cn.com/problems/reverse-only-letters/solution)|52.6%|简单|14.63%|
|68|[文本左右对齐](https://leetcode-cn.com/problems/text-justification)   |[31](https://leetcode-cn.com/problems/text-justification/solution)|41.8%|困难|14.42%|
|824|[山羊拉丁文](https://leetcode-cn.com/problems/goat-latin)   |[27](https://leetcode-cn.com/problems/goat-latin/solution)|58.2%|简单|14.17%|
|1165|[单行键盘](https://leetcode-cn.com/problems/single-row-keyboard)   |[30](https://leetcode-cn.com/problems/single-row-keyboard/solution)|82.0%|简单|14.01%|
|859|[亲密字符串](https://leetcode-cn.com/problems/buddy-strings)   |[35](https://leetcode-cn.com/problems/buddy-strings/solution)|27.5%|简单|13.69%|
|1233|[删除子文件夹](https://leetcode-cn.com/problems/remove-sub-folders-from-the-filesystem)   |[16](https://leetcode-cn.com/problems/remove-sub-folders-from-the-filesystem/solution)|40.5%|中等|13.66%|
|788|[旋转数字](https://leetcode-cn.com/problems/rotated-digits)   |[23](https://leetcode-cn.com/problems/rotated-digits/solution)|58.3%|简单|13.51%|
|842|[将数组拆分成斐波那契序列](https://leetcode-cn.com/problems/split-array-into-fibonacci-sequence)   |[20](https://leetcode-cn.com/problems/split-array-into-fibonacci-sequence/solution)|35.3%|中等|12.94%|
|58|[最后一个单词的长度](https://leetcode-cn.com/problems/length-of-last-word)   |[235](https://leetcode-cn.com/problems/length-of-last-word/solution)|31.8%|简单|12.67%|
|937|[重新排列日志文件](https://leetcode-cn.com/problems/reorder-data-in-log-files)   |[12](https://leetcode-cn.com/problems/reorder-data-in-log-files/solution)|50.2%|简单|12.49%|
|925|[长按键入](https://leetcode-cn.com/problems/long-pressed-name)   |[46](https://leetcode-cn.com/problems/long-pressed-name/solution)|44.6%|简单|12.3%|
|890|[查找和替换模式](https://leetcode-cn.com/problems/find-and-replace-pattern)   |[13](https://leetcode-cn.com/problems/find-and-replace-pattern/solution)|69.2%|中等|10.93%|
|893|[特殊等价字符串组](https://leetcode-cn.com/problems/groups-of-special-equivalent-strings)   |[13](https://leetcode-cn.com/problems/groups-of-special-equivalent-strings/solution)|64.8%|简单|10.9%|
|791|[自定义字符串排序](https://leetcode-cn.com/problems/custom-sort-string)   |[18](https://leetcode-cn.com/problems/custom-sort-string/solution)|63.8%|中等|10.51%|
|680|[验证回文字符串 Ⅱ](https://leetcode-cn.com/problems/valid-palindrome-ii)   |[36](https://leetcode-cn.com/problems/valid-palindrome-ii/solution)|34.1%|简单|10.31%|
|1163|[按字典序排在最后的子串](https://leetcode-cn.com/problems/last-substring-in-lexicographical-order)   |[22](https://leetcode-cn.com/problems/last-substring-in-lexicographical-order/solution)|21.4%|困难|9.78%|
|345|[反转字符串中的元音字母](https://leetcode-cn.com/problems/reverse-vowels-of-a-string)   |[79](https://leetcode-cn.com/problems/reverse-vowels-of-a-string/solution)|48.4%|简单|8.89%|
|1189|[“气球” 的最大数量](https://leetcode-cn.com/problems/maximum-number-of-balloons)   |[60](https://leetcode-cn.com/problems/maximum-number-of-balloons/solution)|61.8%|简单|8.11%|
|657|[机器人能否返回原点](https://leetcode-cn.com/problems/robot-return-to-origin)   |[71](https://leetcode-cn.com/problems/robot-return-to-origin/solution)|72.6%|简单|8.04%|
|696|[计数二进制子串](https://leetcode-cn.com/problems/count-binary-substrings)   |[25](https://leetcode-cn.com/problems/count-binary-substrings/solution)|48.8%|简单|7.64%|
|929|[独特的电子邮件地址](https://leetcode-cn.com/problems/unique-email-addresses)   |[38](https://leetcode-cn.com/problems/unique-email-addresses/solution)|63.9%|简单|6.59%|
|1249|[移除无效的括号](https://leetcode-cn.com/problems/minimum-remove-to-make-valid-parentheses)   |[37](https://leetcode-cn.com/problems/minimum-remove-to-make-valid-parentheses/solution)|52.9%|中等|6.4%|
|521|[最长特殊序列 Ⅰ](https://leetcode-cn.com/problems/longest-uncommon-subsequence-i)   |[28](https://leetcode-cn.com/problems/longest-uncommon-subsequence-i/solution)|65.1%|简单|6.05%|
|1221|[分割平衡字符串](https://leetcode-cn.com/problems/split-a-string-in-balanced-strings)   |[121](https://leetcode-cn.com/problems/split-a-string-in-balanced-strings/solution)|76.3%|简单|5.36%|
|819|[最常见的单词](https://leetcode-cn.com/problems/most-common-word)   |[28](https://leetcode-cn.com/problems/most-common-word/solution)|37.5%|简单|5.21%|
|551|[学生出勤记录 I](https://leetcode-cn.com/problems/student-attendance-record-i)   |[38](https://leetcode-cn.com/problems/student-attendance-record-i/solution)|49.9%|简单|4.98%|
|1297|[子串的最大出现次数](https://leetcode-cn.com/problems/maximum-number-of-occurrences-of-a-substring)   |[19](https://leetcode-cn.com/problems/maximum-number-of-occurrences-of-a-substring/solution)|40.4%|中等|4.05%|
|1268|[搜索推荐系统](https://leetcode-cn.com/problems/search-suggestions-system)   |[41](https://leetcode-cn.com/problems/search-suggestions-system/solution)|48.8%|中等| |
|1170|[比较字符串最小字母出现频次](https://leetcode-cn.com/problems/compare-strings-by-frequency-of-the-smallest-character)   |[38](https://leetcode-cn.com/problems/compare-strings-by-frequency-of-the-smallest-character/solution)|58.9%|简单| |
|1138|[字母板上的路径](https://leetcode-cn.com/problems/alphabet-board-path)   |[29](https://leetcode-cn.com/problems/alphabet-board-path/solution)|36.7%|中等| |
|1271|[十六进制魔术数字](https://leetcode-cn.com/problems/hexspeak)   |[7](https://leetcode-cn.com/problems/hexspeak/solution)|43.8%|简单| |
|1216|[验证回文字符串 III](https://leetcode-cn.com/problems/valid-palindrome-iii)   |[8](https://leetcode-cn.com/problems/valid-palindrome-iii/solution)|46.4%|困难| |
|1181|[前后拼接](https://leetcode-cn.com/problems/before-and-after-puzzle)   |[6](https://leetcode-cn.com/problems/before-and-after-puzzle/solution)|31.4%|中等| |
|1180|[统计只含单一字母的子串](https://leetcode-cn.com/problems/count-substrings-with-only-one-distinct-letter)   |[9](https://leetcode-cn.com/problems/count-substrings-with-only-one-distinct-letter/solution)|72.7%|简单| |
|1119|[删去字符串中的元音](https://leetcode-cn.com/problems/remove-vowels-from-a-string)   |[31](https://leetcode-cn.com/problems/remove-vowels-from-a-string/solution)|82.7%|简单| |
|1100|[长度为 K 的无重复字符子串](https://leetcode-cn.com/problems/find-k-length-substrings-with-no-repeated-characters)   |[7](https://leetcode-cn.com/problems/find-k-length-substrings-with-no-repeated-characters/solution)|60.8%|中等| |
|1065|[字符串的索引对](https://leetcode-cn.com/problems/index-pairs-of-a-string)   |[7](https://leetcode-cn.com/problems/index-pairs-of-a-string/solution)|48.1%|简单| |
|1016|[子串能表示从 1 到 N 数字的二进制串](https://leetcode-cn.com/problems/binary-string-with-substrings-representing-1-to-n)   |[10](https://leetcode-cn.com/problems/binary-string-with-substrings-representing-1-to-n/solution)|55.8%|中等| |
|1062|[最长重复子串](https://leetcode-cn.com/problems/longest-repeating-substring)   |[11](https://leetcode-cn.com/problems/longest-repeating-substring/solution)|41.4%|中等| |
|1003|[检查替换后的词是否有效](https://leetcode-cn.com/problems/check-if-word-is-valid-after-substitutions)   |[17](https://leetcode-cn.com/problems/check-if-word-is-valid-after-substitutions/solution)|55.0%|中等| |
|966|[元音拼写检查器](https://leetcode-cn.com/problems/vowel-spellchecker)   |[8](https://leetcode-cn.com/problems/vowel-spellchecker/solution)|35.9%|中等| |
|936|[戳印序列](https://leetcode-cn.com/problems/stamping-the-sequence)   |[2](https://leetcode-cn.com/problems/stamping-the-sequence/solution)|29.0%|困难| |
|848|[字母移位](https://leetcode-cn.com/problems/shifting-letters)   |[19](https://leetcode-cn.com/problems/shifting-letters/solution)|38.0%|中等| |
|816|[模糊坐标](https://leetcode-cn.com/problems/ambiguous-coordinates)   |[9](https://leetcode-cn.com/problems/ambiguous-coordinates/solution)|47.1%|中等| |
|809|[情感丰富的文字](https://leetcode-cn.com/problems/expressive-words)   |[14](https://leetcode-cn.com/problems/expressive-words/solution)|37.2%|中等| |
|800|[相似 RGB 颜色](https://leetcode-cn.com/problems/similar-rgb-color)   |[7](https://leetcode-cn.com/problems/similar-rgb-color/solution)|64.6%|简单| |
|772|[基本计算器 III](https://leetcode-cn.com/problems/basic-calculator-iii)   |[10](https://leetcode-cn.com/problems/basic-calculator-iii/solution)|30.7%|困难| |
|770|[基本计算器 IV](https://leetcode-cn.com/problems/basic-calculator-iv)   |[4](https://leetcode-cn.com/problems/basic-calculator-iv/solution)|47.3%|困难| |
|761|[特殊的二进制序列](https://leetcode-cn.com/problems/special-binary-string)   |[4](https://leetcode-cn.com/problems/special-binary-string/solution)|54.2%|困难| |
|730|[统计不同回文子字符串](https://leetcode-cn.com/problems/count-different-palindromic-subsequences)   |[5](https://leetcode-cn.com/problems/count-different-palindromic-subsequences/solution)|43.3%|困难| |
|681|[最近时刻](https://leetcode-cn.com/problems/next-closest-time)   |[10](https://leetcode-cn.com/problems/next-closest-time/solution)|46.1%|中等| |
|635|[设计日志存储系统](https://leetcode-cn.com/problems/design-log-storage-system)   |[9](https://leetcode-cn.com/problems/design-log-storage-system/solution)|54.9%|中等| |
|609|[在系统中查找重复文件](https://leetcode-cn.com/problems/find-duplicate-file-in-system)   |[9](https://leetcode-cn.com/problems/find-duplicate-file-in-system/solution)|54.0%|中等| |
|591|[标签验证器](https://leetcode-cn.com/problems/tag-validator)   |[9](https://leetcode-cn.com/problems/tag-validator/solution)|28.5%|困难| |
|553|[最优除法](https://leetcode-cn.com/problems/optimal-division)   |[9](https://leetcode-cn.com/problems/optimal-division/solution)|53.3%|中等| |
|522|[最长特殊序列 II](https://leetcode-cn.com/problems/longest-uncommon-subsequence-ii)   |[11](https://leetcode-cn.com/problems/longest-uncommon-subsequence-ii/solution)|31.3%|中等| |
|293|[翻转游戏](https://leetcode-cn.com/problems/flip-game)   |[16](https://leetcode-cn.com/problems/flip-game/solution)|68.9%|简单| |
|249|[移位字符串分组](https://leetcode-cn.com/problems/group-shifted-strings)   |[17](https://leetcode-cn.com/problems/group-shifted-strings/solution)|58.5%|中等| |
|158|[用 Read4 读取 N 个字符 II](https://leetcode-cn.com/problems/read-n-characters-given-read4-ii-call-multiple-times)   |[11](https://leetcode-cn.com/problems/read-n-characters-given-read4-ii-call-multiple-times/solution)|55.6%|困难| |