update post

Author: dev-jonghoonpark

_posts/2024-02-18-leetcode-3.md

@@ -37,9 +37,7 @@ class Solution:
             return length
 
         for i, char in enumerate(characters):
-            length = findLongestSubstring(i)
-            if length > longest:
-                longest = length
+            longest = max(longest, findLongestSubstring(i))
 
         return longest
 ```