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Update0078.子集,添加C#

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Original file line number	Diff line number	Diff line change
`@@ -443,6 +443,27 @@ object Solution {`
`443`	`443`	`}`
`444`	`444`	`}`
`445`	`445`	```
	`446`	`+### C#`
	`447`	+```csharp
	`448`	`+public class Solution {`
	`449`	`+ public IList<IList<int>> res = new List<IList<int>>();`
	`450`	`+ public IList<int> path = new List<int>();`
	`451`	`+ public IList<IList<int>> Subsets(int[] nums) {`
	`452`	`+ BackTracking(nums, 0);`
	`453`	`+ return res;`
	`454`	`+ }`
	`455`	`+ public void BackTracking(int[] nums, int start){`
	`456`	`+ res.Add(new List<int>(path));`
	`457`	`+ if(start > nums.Length) return;`
	`458`	`+ for (int i = start; i < nums.Length; i++)`
	`459`	`+ {`
	`460`	`+ path.Add(nums[i]);`
	`461`	`+ BackTracking(nums, i + 1);`
	`462`	`+ path.RemoveAt(path.Count - 1);`
	`463`	`+ }`
	`464`	`+ }`
	`465`	`+}`
	`466`	+```
`446`	`467`
`447`	`468`
`448`	`469`	`<p align="center">`

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