nature1995
diff --git a/‎Python3/046_Permutations.py
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+7-6Lines changed: 7 additions & 6 deletions b/‎Python3/046_Permutations.py
Copy file name to clipboardExpand all lines: Python3/046_Permutations.py
+7-6Lines changed: 7 additions & 6 deletions
diff --git a/‎Python3/048_Rotate Image.py
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+28Lines changed: 28 additions & 0 deletions b/‎Python3/048_Rotate Image.py
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+28Lines changed: 28 additions & 0 deletions
@@ -19,14 +19,15 @@ def permute(self, nums):
         self.get_permute([], nums, result)
         return result
 
-    def get_permute(self, current, num, result):
-        if not num:
+    def get_permute(self, current, nums, result):
+        if not nums:
             result.append(current + [])
             return
-        for i, v in enumerate(num):
-            current.append(num[i])
-            self.get_permute(current, num[:i] + num[i + 1:], result)
-            current.pop()
+        else:
+            for i, v in enumerate(nums):
+                current.append(nums[i])
+                self.get_permute(current, nums[:i] + nums[i + 1:], result)
+                current.pop()
 
 
 if __name__ == "__main__":
 
@@ -0,0 +1,28 @@
+#!usr/bin/env python3
+# -*- coding:utf-8 -*-
+'''
+You are given an n x n 2D matrix representing an image.
+
+Rotate the image by 90 degrees (clockwise).
+
+Follow up:
+Could you do this in-place?
+'''
+
+
+class Solution(object):
+    def rotate(self, matrix):
+        """
+        :type matrix: List[List[int]]
+        :rtype: void Do not return anything, modify matrix in-place instead.
+        """
+        n = len(matrix)
+        for i in range(n):
+            for j in range(i + 1, n):
+                matrix[i][j], matrix[j][i] =  matrix[j][i], matrix[i][j]
+        for i in range(n):
+            matrix[i].reverse()
+        return matrix
+
+if __name__ == "__main__":
+    assert Solution().rotate([[1, 2, 3], [8, 9, 4], [7, 6, 5]]) == [[7, 8, 1], [6, 9, 2], [5, 4, 3]]