Update addTwoNumbers.md

azl397985856 · web-flow · commit 09ff3cb3c888 · 2018-03-30T17:22:40.000+08:00
diff --git a/addTwoNumbers.md b/addTwoNumbers.md
@@ -1,5 +1,15 @@
 ## 题目描述
+You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.
 
+You may assume the two numbers do not contain any leading zero, except the number 0 itself.
+
+Example
+```
+Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
+Output: 7 -> 0 -> 8
+Explanation: 342 + 465 = 807.
+
+```
 ## 思路
 
 ## 代码
