From 984a3ae5bc7d08bb70b05601d96d57b1b0c9c791 Mon Sep 17 00:00:00 2001
From: cylin2000 <cylin2000@163.com>
Date: Fri, 25 Feb 2022 10:56:23 +0000
Subject: [PATCH 1/2] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=20=E4=BA=8C=E5=88=86?=
 =?UTF-8?q?=E6=9F=A5=E6=89=BE=20C#=20=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0704.二分查找.md | 46 +++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/problems/0704.二分查找.md b/problems/0704.二分查找.md
index 379cb5fc..635868a9 100644
--- a/problems/0704.二分查找.md
+++ b/problems/0704.二分查找.md
@@ -561,5 +561,51 @@ class Solution {
 }
 ```
 
+**C#**
+```csharp
+//左闭右闭
+public class Solution {  
+    public int Search(int[] nums, int target) {
+        int left = 0;
+        int right = nums.Length - 1;
+        while(left <= right){
+            int mid = (right - left ) / 2 + left;
+            if(nums[mid] == target){
+                return mid;
+            }
+            else if(nums[mid] < target){
+                left = mid+1;
+            }
+            else if(nums[mid] > target){
+                right = mid-1;
+            }
+        }
+        return -1;
+    }
+}
+
+//左闭右开
+public class Solution{
+    public int Search(int[] nums, int target){
+        int left = 0;
+        int right = nums.Length;
+        while(left < right){
+            int mid = (right - left) / 2 + left;
+            if(nums[mid] == target){
+                return mid;
+            }
+            else if(nums[mid] < target){
+                left = mid + 1;
+            }
+            else if(nums[mid] > target){
+                right = mid;
+            }
+        }
+        return -1;
+    }
+}
+```
+
+
 -----------------------
 <div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>

From 3f189d4687818313a90bc240524a3dc049f39ec4 Mon Sep 17 00:00:00 2001
From: cylin2000 <cylin2000@163.com>
Date: Fri, 25 Feb 2022 10:57:05 +0000
Subject: [PATCH 2/2] Add :

---
 problems/0704.二分查找.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/problems/0704.二分查找.md b/problems/0704.二分查找.md
index 635868a9..15e096a0 100644
--- a/problems/0704.二分查找.md
+++ b/problems/0704.二分查找.md
@@ -561,7 +561,7 @@ class Solution {
 }
 ```
 
-**C#**
+**C#:**
 ```csharp
 //左闭右闭
 public class Solution {