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Update0090.子集2,添加C#

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Original file line number	Diff line number	Diff line change
`@@ -640,6 +640,31 @@ object Solution {`
`640`	`640`	`}`
`641`	`641`	`}`
`642`	`642`	```
	`643`	`+### C#`
	`644`	+```c#
	`645`	`+public class Solution`
	`646`	`+{`
	`647`	`+ public IList<IList<int>> res = new List<IList<int>>();`
	`648`	`+ public IList<int> path = new List<int>();`
	`649`	`+ public IList<IList<int>> SubsetsWithDup(int[] nums)`
	`650`	`+ {`
	`651`	`+ Array.Sort(nums);`
	`652`	`+ BackTracking(nums, 0);`
	`653`	`+ return res;`
	`654`	`+ }`
	`655`	`+ public void BackTracking(int[] nums, int start)`
	`656`	`+ {`
	`657`	`+ res.Add(new List<int>(path));`
	`658`	`+ for (int i = start; i < nums.Length; i++)`
	`659`	`+ {`
	`660`	`+ if (i > start && nums[i] == nums[i - 1]) continue;`
	`661`	`+ path.Add(nums[i]);`
	`662`	`+ BackTracking(nums, i + 1);`
	`663`	`+ path.RemoveAt(path.Count - 1);`
	`664`	`+ }`
	`665`	`+ }`
	`666`	`+}`
	`667`	+```
`643`	`668`
`644`	`669`	`<p align="center">`
`645`	`670`	`<a href="https://programmercarl.com/other/kstar.html" target="_blank">`

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