字符串数组中的典型习题有哪些？

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1. 字符串 + 转换为大写/小写 - 题目链接：[https://leetcode-cn.com/problems/to-lower-case/](https://leetcode-cn.com/problems/to-lower-case/) - 题目描述：将字符串中的所有大写字母转换为小写字母。

2. 字符串 + 获取最后一个单词的长度 - 题目链接：[https://leetcode-cn.com/problems/length-of-last-word/](https://leetcode-cn.com/problems/length-of-last-word/) - 题目描述：给定一个字符串，返回最后一个单词的长度。

3. 字符串 + 宝石与石头 - 题目链接：[https://leetcode-cn.com/problems/jewels-and-stones/](https://leetcode-cn.com/problems/jewels-and-stones/) - 题目描述：给定字符串 jewels 表示你可以收集到的宝石类型，和字符串 stones 表示你拥有的石头。返回你最多能收集的宝石数量。

4. 字符串 + 第一个唯一字符 - 题目链接：[https://leetcode-cn.com/problems/first-unique-character-in-a-string/](https://leetcode-cn.com/problems/first-unique-character-in-a-string/) - 题目描述：在字符串 s 中找到第一个只出现一次的字符，并返回它的索引。如果不存在，则返回 -1。

1. 字符串

1、字符串基础问题leetcode-cn.com/problems/to-lower-case/leetcode-cn.com/problems/length-of-last-word/leetcode-cn.com/problems/jewels-and-stones/leetcode-cn.com/problems/first-unique-character-in-a-string/leetcode-cn.com/problems/string-to-integer-atoi/

2、字符串操作问题leetcode-cn.com/problems/longest-common-prefix/description/leetcode-cn.com/problems/reverse-stringleetcode-cn.com/problems/reverse-string-ii/leetcode-cn.com/problems/reverse-words-in-a-string/leetcode-cn.com/problems/reverse-words-in-a-string-iii/leetcode-cn.com/problems/reverse-only-letters/

3、异位词问题leetcode-cn.com/problems/valid-anagram/leetcode-cn.com/problems/group-anagrams/leetcode-cn.com/problems/find-all-anagrams-in-a-string/

4、回文串问题leetcode-cn.com/problems/valid-palindrome/leetcode-cn.com/problems/valid-palindrome-ii/leetcode-cn.com/problems/longest-palindromic-substring/

5、最长子串、子序列问题leetcode-cn.com/problems/longest-common-subsequence/leetcode-cn.com/problems/edit-distance/leetcode-cn.com/problems/longest-palindromic-substring/

6、字符串 +DP 问题leetcode-cn.com/problems/regular-expression-matching/leetcode-cn.com/problems/regular-expression-matching/solution/ji-yu-guan-fang-ti-jie-gen-xiang-xi-de-jiang-jie-b/leetcode-cn.com/problems/wildcard-matching/leetcode-cn.com/problems/distinct-subsequences/

7、其他

leetcode-cn.com/problems/first-unique-character-in-a-string/leetcode-cn.com/problems/string-to-integer-atoi/leetcode-cn.com/problems/reverse-string-ii/leetcode-cn.com/problems/reverse-words-in-a-string/leetcode-cn.com/problems/reverse-words-in-a-string-iii/leetcode-cn.com/problems/reverse-only-letters/leetcode-cn.com/problems/find-all-anagrams-in-a-string/leetcode-cn.com/problems/longest-palindromic-substring/leetcode-cn.com/problems/isomorphic-strings/leetcode-cn.com/problems/valid-palindrome-ii/leetcode-cn.com/problems/wildcard-matchingleetcode-cn.com/problems/longest-valid-parenthesesleetcode-cn.com/problems/distinct-subsequences/

2. 数组

1、ArrayList 题目leetcode-cn.com/problems/container-with-most-water/leetcode-cn.com/problems/move-zeroes/leetcode.com/problems/climbing-stairs/leetcode-cn.com/problems/3sum/ 

2、Linked List 实战题目leetcode.com/problems/reverse-linked-list/leetcode.com/problems/swap-nodes-in-pairsleetcode.com/problems/linked-list-cycleleetcode.com/problems/linked-list-cycle-iileetcode.com/problems/reverse-nodes-in-k-group/

3、其他leetcode-cn.com/problems/remove-duplicates-from-sorted-array/leetcode-cn.com/problems/rotate-array/leetcode-cn.com/problems/merge-two-sorted-lists/leetcode-cn.com/problems/merge-sorted-array/leetcode-cn.com/problems/two-sum/leetcode-cn.com/problems/move-zeroes/leetcode-cn.com/problems/plus-one/