weixin_45470102的博客

Array双array iteratewhile ...: if i >= m or arr[i] < arr[j]: // 这一步如果i < m但是j >= n, 第二个判断会out of bound ... else: ...

好好看一下这个文档，对方是怎么define union find这个API的https://python-algorithms.readthedocs.io/en/stable/_modules/python_algorithms/basic/union_find.html

文章目录StackDecode and Encode StringStackDecode and Encode Stringhttps://leetcode.com/problems/valid-parentheses/input: ‘([)]’output: True or False多种括号问题，容易错，还是得用stack，用count是不行的。。。Trapping Rain ...

binary tree iteratorhttps://leetcode.com/problems/binary-search-tree-iterator/

https://leetcode.com/problems/decode-string/