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Update 0137-Single-Number-II.md

添加C++、Java、Python代码实现

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`@@ -46,5 +46,45 @@`
`46`	`46`
`47`	`47`	`![](../Animation/137.gif)`
`48`	`48`
	`49`	`+### 代码实现`
	`50`	`+#### C++`
	`51`	+```c++
	`52`	`+class Solution {`
	`53`	`+public:`
	`54`	`+ int singleNumber(vector<int>& nums) {`
	`55`	`+ int one=0, two=0;`
	`56`	`+ for(int n:nums)`
	`57`	`+ {`
	`58`	`+ one = (one ^ n) & (~two);`
	`59`	`+ two = (two ^ n) & (~one);`
	`60`	`+ }`
	`61`	`+ return one;`
	`62`	`+ }`
	`63`	`+};`
	`64`	+```
	`65`	`+#### Java`
	`66`	+```java
	`67`	`+class Solution {`
	`68`	`+ public int singleNumber(int[] nums) {`
	`69`	`+ int one=0, two=0;`
	`70`	`+ for(int n:nums)`
	`71`	`+ {`
	`72`	`+ one = (one ^ n) & (~two);`
	`73`	`+ two = (two ^ n) & (~one);`
	`74`	`+ }`
	`75`	`+ return one;`
	`76`	`+ }`
	`77`	`+}`
	`78`	+```
	`79`	`+#### Python`
	`80`	+```python
	`81`	`+class Solution(object):`
	`82`	`+ def singleNumber(self, nums):`
	`83`	`+ one = two = 0`
	`84`	`+ for n in nums:`
	`85`	`+ one = (one ^ n) & (~two)`
	`86`	`+ two = (two ^ n) & (~one)`
	`87`	`+ return one`
	`88`	+```
`49`	`89`
`50`		`-![](../../Pictures/qrcode.jpg)`
	`90`	`+![](../../Pictures/qrcode.jpg)`

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