1. 字符串

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

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

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

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

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

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

7、其他

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

2. 数组

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

2、Linked List 实战题目 https://leetcode.com/problems/reverse-linked-list/ https://leetcode.com/problems/swap-nodes-in-pairs https://leetcode.com/problems/linked-list-cycle https://leetcode.com/problems/linked-list-cycle-ii https://leetcode.com/problems/reverse-nodes-in-k-group/

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