fixed typo

billryan · billryan · commit a64cd9d7adfc · 2015-04-23T14:56:20.000+08:00
diff --git a/linked_list/two_lists_sum.md b/linked_list/two_lists_sum.md
@@ -1,6 +1,4 @@
-# Two Lists Sum <i class="fa fa-star"></i><i class="fa fa-star"></i><i class="fa fa-star"></i>
-
-tags: linked list, recursion, iteration
+# Two Lists Sum <i class="fa fa-star"></i><i class="fa fa-star"></i><i class="fa fa-star-half-o"></i>
 
 ## Source
 
diff --git a/linked_list/two_lists_sum_advanced.md b/linked_list/two_lists_sum_advanced.md
@@ -1,29 +1,31 @@
-# Two Lists Sum Advanced <i class="fa fa-star"></i><i class="fa fa-star"></i><i class="fa fa-star"></i><i class="fa fa-star-half-o"></i>
-
-tags: linked list, recursion, iteration
+# Two Lists Sum Advanced <i class="fa fa-star"></i><i class="fa fa-star"></i><i class="fa fa-star"></i>
 
 ## Source
 
-- GeeksforGeeks - [Add two numbers represented by linked lists | Set 2 - GeeksforGeeks](http://www.geeksforgeeks.org/sum-of-two-linked-lists/)
+- CC150 - [Add two numbers represented by linked lists | Set 2 - GeeksforGeeks](http://www.geeksforgeeks.org/sum-of-two-linked-lists/)
 
 ```
 Given two numbers represented by two linked lists, write a function that returns sum list.
 The sum list is linked list representation of addition of two input numbers.
-It is not allowed to modify the lists.
 
 Example
 
 Input:
-  First List: 5->6->3  // represents number 563
-  Second List: 8->4->2 //  represents number 842
+  First  List: 5->6->3  // represents number 563
+  Second List: 8->4->2  // represents number 842
 Output
   Resultant list: 1->4->0->5  // represents number 1405
 
 Challenge
 
+Not allowed to modify the lists.
 Not allowed to use explicit extra space.
 ```
 
+### 题解1 - 反转链表
+
+在题 [Two Lists Sum | Data Structure and Algorithm](http://algorithm.yuanbin.me/linked_list/two_lists_sum.html) 的基础上改了下数位的表示方式，前者低位在前，高位在后，这个题的高位在前，低位在后。很自然地可以联想到先将链表反转，而后再使用 Two Lists Sum 的解法。
+
 ## Reference
 
 - [Add two numbers represented by linked lists | Set 2 - GeeksforGeeks](http://www.geeksforgeeks.org/sum-of-two-linked-lists/)
