Update.0045跳跃游戏2，添加C#版本二

problems/0045.跳跃游戏II.md

@@ -464,6 +464,27 @@ impl Solution {
     }
 }
 ```
+### C#
+```csharp
+// 版本二
+public class Solution
+{
+    public int Jump(int[] nums)
+    {
+        int cur = 0, next = 0, step = 0;
+        for (int i = 0; i < nums.Length - 1; i++)
+        {
+            next = Math.Max(next, i + nums[i]);
+            if (i == cur)
+            {
+                cur = next;
+                step++;
+            }
+        }
+        return step;
+    }
+}
+```
 
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