diff --git a/Answer1.9.cpp b/Answer1.9.cpp
new file mode 100644
index 0000000..a21342c
--- /dev/null
+++ b/Answer1.9.cpp
@@ -0,0 +1,22 @@
+class Solution {
+public:
+    void nextPermutation(vector<int>& nums) {
+    	int n = nums.size(), k, l;
+    	for (k = n - 2; k >= 0; k--) {
+            if (nums[k] < nums[k + 1]) {
+                break;
+            }
+        }
+    	if (k < 0) {
+    	    reverse(nums.begin(), nums.end());
+    	} else {
+    	    for (l = n - 1; l > k; l--) {
+                if (nums[l] > nums[k]) {
+                    break;
+                }
+            } 
+    	    swap(nums[k], nums[l]);
+    	    reverse(nums.begin() + k + 1, nums.end());
+        }
+    }
+}; 
\ No newline at end of file