vault backup: 2022-09-20 13:19:16

OJ notes/pages/Leetcode Reverse-Linked-List.md

@@ -23,6 +23,7 @@
 ##### Revisions:
 
 2022-07-02
+2022-09-20
 
 ##### Related topics:
 
@@ -70,8 +71,15 @@ Given the `head` of a singly linked list, reverse the list, and return _the reve
 
 ### Thoughts
 
+Many ways to implement this. from slow but easy ones, to
+fast but hard ones:
+
+#### Easy way: 
+
 I thought a slow O(n ^ 2) hybrid solution, while there are better algorithms, using in-place insert, or recursion.
 
+#### Fast way:
+
 The in place insert is easier to understand, and simple to implement, using a very clever trick.
 
 > [!summary] My thoughts on the recursion algorithm