Update 1049.最后一块石头的重量2，添加C#

problems/1049.最后一块石头的重量II.md

@@ -472,6 +472,30 @@ impl Solution {
     }
 }
 ```
+### C#
+```csharp
+public class Solution
+{
+    public int LastStoneWeightII(int[] stones)
+    {
+        int[] dp = new int[15001];
+        int sum = 0;
+        foreach (int stone in stones)
+        {
+            sum += stone;
+        }
+        int target = sum / 2;
+        for (int i = 0; i < stones.Length; i++)
+        {
+            for (int j = target; j >= stones[i]; j--)
+            {
+                dp[j] = Math.Max(dp[j], dp[j - stones[i]] + stones[i]);
+            }
+        }
+        return sum - 2 * dp[target];
+    }
+}
+```
 
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