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Update 0002-Add-Two-Numbers.md

添加Java、Python代码实现

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Original file line number	Diff line number	Diff line change
`@@ -32,7 +32,8 @@`
`32`	`32`
`33`	`33`	`### 代码实现`
`34`	`34`
`35`		-```
	`35`	`+#### C++`
	`36`	+```c++
`36`	`37`	`/// 时间复杂度: O(n)`
`37`	`38`	`/// 空间复杂度: O(n)`
`38`	`39`	`/**`
`@@ -70,7 +71,68 @@ public:`
`70`	`71`	`};`
`71`	`72`
`72`	`73`	```
`73`		`-`
	`74`	`+#### Java`
	`75`	+```java
	`76`	`+class Solution {`
	`77`	`+ public ListNode addTwoNumbers(ListNode l1, ListNode l2) {`
	`78`	`+ ListNode dummyHead = new ListNode(0);`
	`79`	`+ ListNode cur = dummyHead;`
	`80`	`+ int carry = 0;`
	`81`	`+`
	`82`	`+ while(l1 != null \|\| l2 != null)`
	`83`	`+ {`
	`84`	`+ int sum = carry;`
	`85`	`+ if(l1 != null)`
	`86`	`+ {`
	`87`	`+ sum += l1.val;`
	`88`	`+ l1 = l1.next;`
	`89`	`+ }`
	`90`	`+ if(l2 != null)`
	`91`	`+ {`
	`92`	`+ sum += l2.val;`
	`93`	`+ l2 = l2.next;`
	`94`	`+ }`
	`95`	`+ // 创建新节点`
	`96`	`+ carry = sum / 10;`
	`97`	`+ cur.next = new ListNode(sum % 10);`
	`98`	`+ cur = cur.next;`
	`99`	`+`
	`100`	`+ }`
	`101`	`+ if (carry > 0) {`
	`102`	`+ cur.next = new ListNode(carry);`
	`103`	`+ }`
	`104`	`+ return dummyHead.next;`
	`105`	`+ }`
	`106`	`+}`
	`107`	+```
	`108`	`+#### Python`
	`109`	+```python
	`110`	`+class Solution(object):`
	`111`	`+ def addTwoNumbers(self, l1, l2):`
	`112`	`+ res=ListNode(0)`
	`113`	`+ head=res`
	`114`	`+ carry=0`
	`115`	`+ while l1 or l2 or carry!=0:`
	`116`	`+ sum=carry`
	`117`	`+ if l1:`
	`118`	`+ sum+=l1.val`
	`119`	`+ l1=l1.next`
	`120`	`+ if l2:`
	`121`	`+ sum+=l2.val`
	`122`	`+ l2=l2.next`
	`123`	`+ # set value`
	`124`	`+ if sum<=9:`
	`125`	`+ res.val=sum`
	`126`	`+ carry=0`
	`127`	`+ else:`
	`128`	`+ res.val=sum%10`
	`129`	`+ carry=sum//10`
	`130`	`+ # creat new node`
	`131`	`+ if l1 or l2 or carry!=0:`
	`132`	`+ res.next=ListNode(0)`
	`133`	`+ res=res.next`
	`134`	`+ return head`
	`135`	+```
`74`	`136`
`75`	`137`
`76`	`138`	`![](../../Pictures/qrcode.jpg)`

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