1143. 最长公共子序列
Medium | String, Dynamic Programming
String
115. 不同的子序列
Hard | String, Dynamic Programming
1169. 无效的交易
Medium | Array, Hash Table, String, Sorting
1239. 具有唯一字符的最长子序列
Medium | Array, String, Backtracking, Bit Manipulation
126. 单词接龙 II
Hard | Hash Table, String, Backtracking, Breadth-First Search
127. 单词接龙
Hard | Hash Table, String, Breadth-First Search
131. 回文串分割
Medium | String, Dynamic Programming, Backtracking
1312. 使字符串成为回文串的最少插入次数
Hard | String, Dynamic Programming
1316. 不同的回文子串
Hard | String, Trie, Rolling Hash, Hash Function
132. 分割回文串 II
Hard | String, Dynamic Programming