From 8de2e21d59d9fe68a9ac237affecf07b780c103f Mon Sep 17 00:00:00 2001
From: eeee0717 <chentao020717Work@outlook.com>
Date: Mon, 11 Dec 2023 09:35:55 +0800
Subject: [PATCH] =?UTF-8?q?Update0077.=E7=BB=84=E5=90=88=EF=BC=8C=E6=B7=BB?=
 =?UTF-8?q?=E5=8A=A0C#?=
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---
 problems/0077.组合.md | 54 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

diff --git a/problems/0077.组合.md b/problems/0077.组合.md
index a7f00ffe..8bca6f24 100644
--- a/problems/0077.组合.md
+++ b/problems/0077.组合.md
@@ -792,7 +792,59 @@ def backtracking(result, path, n, j, k)
 end
 
 ```
-
+### C#
+```C#
+// 暴力
+public class Solution
+{
+    public IList<IList<int>> res = new List<IList<int>>();
+    public IList<int> path = new List<int>();
+    public IList<IList<int>> Combine(int n, int k)
+    {
+        BackTracking(n, k, 1);
+        return res;
+    }
+    public void BackTracking(int n, int k, int start)
+    {
+        if (path.Count == k)
+        {
+            res.Add(new List<int>(path));
+            return;
+        }
+        for (int i = start; i <= n; i++)
+        {
+            path.Add(i);
+            BackTracking(n, k, i + 1);
+            path.RemoveAt(path.Count - 1);
+        }
+    }
+}
+// 剪枝
+public class Solution
+{
+    public IList<IList<int>> res = new List<IList<int>>();
+    public IList<int> path = new List<int>();
+    public IList<IList<int>> Combine(int n, int k)
+    {
+        BackTracking(n, k, 1);
+        return res;
+    }
+    public void BackTracking(int n, int k, int start)
+    {
+        if (path.Count == k)
+        {
+            res.Add(new List<int>(path));
+            return;
+        }
+        for (int i = start; i <= n - (k - path.Count) + 1; i++)
+        {
+            path.Add(i);
+            BackTracking(n, k, i + 1);
+            path.RemoveAt(path.Count - 1);
+        }
+    }
+}
+```
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