From 7fdb7b17024bbfd7636dbc8100acb1687445b40b Mon Sep 17 00:00:00 2001
From: eeee0717 <chentao020717Work@outlook.com>
Date: Tue, 19 Dec 2023 09:32:06 +0800
Subject: [PATCH] =?UTF-8?q?Update0090.=E5=AD=90=E9=9B=862=EF=BC=8C?=
 =?UTF-8?q?=E6=B7=BB=E5=8A=A0C#?=
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---
 problems/0090.子集II.md | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/problems/0090.子集II.md b/problems/0090.子集II.md
index 13080cd9..9fc334a4 100644
--- a/problems/0090.子集II.md
+++ b/problems/0090.子集II.md
@@ -640,6 +640,31 @@ object Solution {
   }
 }
 ```
+### C#
+```c#
+public class Solution
+{
+    public IList<IList<int>> res = new List<IList<int>>();
+    public IList<int> path = new List<int>();
+    public IList<IList<int>> SubsetsWithDup(int[] nums)
+    {
+        Array.Sort(nums);
+        BackTracking(nums, 0);
+        return res;
+    }
+    public void BackTracking(int[] nums, int start)
+    {
+        res.Add(new List<int>(path));
+        for (int i = start; i < nums.Length; i++)
+        {
+            if (i > start && nums[i] == nums[i - 1]) continue;
+            path.Add(nums[i]);
+            BackTracking(nums, i + 1);
+            path.RemoveAt(path.Count - 1);
+        }
+    }
+}
+```
 
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