Update longest-palindromic-substring.py

kamyu104 · kamyu104 · commit 177f3b753a89 · 2016-03-13T11:17:27.000+08:00
diff --git a/Python/longest-palindromic-substring.py b/Python/longest-palindromic-substring.py
@@ -16,11 +16,11 @@ def longestPalindrome(self, s):
         """
         def preProcess(s):
             if not s:
-                return "^$"
-            T = "^"
-            for i in s:
-                T +=  "#" + i
-            T += "#$"
+                return ['^', '$']
+            T = ['^']
+            for c in s:
+                T +=  ['#', c]
+            T += ['#', '$']
             return T
 
         T = preProcess(s)
