Update 0343.整数拆分，添加C#

problems/0343.整数拆分.md

@@ -496,6 +496,25 @@ class Solution {
     }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public int IntegerBreak(int n)
+    {
+        int[] dp = new int[n + 1];
+        dp[2] = 1;
+        for (int i = 3; i <= n; i++)
+        {
+            for (int j = 1; j <= i / 2; j++)
+            {
+                dp[i] = Math.Max(dp[i],Math.Max(j*(i-j),j*dp[i-j]));
+            }
+        }
+        return dp[n];
+    }
+}
+```
 
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