Update Rotate List.cpp

daizhenyang · daizhenyang · commit 462eb0d55810 · 2013-08-31T16:33:16.000-04:00
diff --git a/Rotate List.cpp b/Rotate List.cpp
@@ -18,7 +18,7 @@ class Solution {
             ++len;
             ptr=ptr->next;
         }
-        if (!len)return head;
+        if (!len)return head;//forgot to judge oringinal list is NULL
         k%=len;
         if (!k)return head;
         int c=len-k;

Original file line number	Diff line number	Diff line change
`@@ -18,7 +18,7 @@ class Solution {`
`18`	`18`	`++len;`
`19`	`19`	`ptr=ptr->next;`
`20`	`20`	`}`
`21`		`- if (!len)return head;`
	`21`	`+ if (!len)return head;//forgot to judge oringinal list is NULL`
`22`	`22`	`k%=len;`
`23`	`23`	`if (!k)return head;`
`24`	`24`	`int c=len-k;`